{"id":60454,"date":"2026-07-17T12:59:34","date_gmt":"2026-07-17T10:59:34","guid":{"rendered":"https:\/\/alertes-meteo.com\/?page_id=60454"},"modified":"2026-07-17T12:59:34","modified_gmt":"2026-07-17T10:59:34","slug":"calculer-lindice-humidex-temperature-ressentie-avec-lhumidite","status":"publish","type":"page","link":"https:\/\/alertes-meteo.com\/index.php\/cartes-meteo\/calculer-lindice-humidex-temperature-ressentie-avec-lhumidite\/","title":{"rendered":"Calculer l&rsquo;indice humidex &#8211; Temp\u00e9rature ressentie avec l&rsquo;humidit\u00e9"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1575px;margin-left: calc(-5% \/ 2 );margin-right: calc(-5% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-blend:overlay;--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:2.375%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:2.375%;--awb-width-medium:100%;--awb-spacing-right-medium:2.375%;--awb-spacing-left-medium:2.375%;--awb-width-small:100%;--awb-spacing-right-small:2.375%;--awb-spacing-left-small:2.375%;\"><div class=\"fusion-column-wrapper fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-1\"><h1 align=\"center\">Humidex, calcul, inconfort et risque de coup de chaleur<\/h1>\n<\/div><div class=\"humidex-calculator\">\n  <h3>Calculer l\u2019indice Humidex<\/h3>\n\n  <p class=\"humidex-intro\">\n    Temp\u00e9rature ressentie en fonction de la chaleur et de l\u2019humidit\u00e9, particuli\u00e8rement utile en \u00e9t\u00e9.\n  <\/p>\n\n  <div class=\"humidex-field\">\n    <label for=\"humidex-temperature\">Temp\u00e9rature actuelle :<\/label>\n    <div class=\"humidex-input\">\n      <input\n        type=\"number\"\n        id=\"humidex-temperature\"\n        step=\"0.1\"\n        placeholder=\"Ex. 30.5\"\n        inputmode=\"decimal\"\n      >\n      <span>\u00b0C<\/span>\n    <\/div>\n  <\/div>\n\n  <div class=\"humidex-field\">\n    <label for=\"humidex-humidity\">Humidit\u00e9 :<\/label>\n    <div class=\"humidex-input\">\n      <input\n        type=\"number\"\n        id=\"humidex-humidity\"\n        min=\"1\"\n        max=\"100\"\n        step=\"0.1\"\n        placeholder=\"Ex. 65\"\n        inputmode=\"decimal\"\n      >\n      <span>%<\/span>\n    <\/div>\n  <\/div>\n\n  <button type=\"button\" id=\"humidex-button\">\n    Calculer l\u2019Humidex\n  <\/button>\n\n  <div class=\"humidex-result\" aria-live=\"polite\">\n    <span>Humidex<\/span>\n    <strong id=\"humidex-value\">\u2014<\/strong>\n    <div id=\"humidex-level\"><\/div>\n  <\/div>\n\n  <p id=\"humidex-error\" class=\"humidex-error\"><\/p>\n\n  <p class=\"humidex-note\">\n    Indiquez les valeurs d\u00e9cimales avec un point au lieu d\u2019une virgule.\n  <\/p>\n<\/div>\n\n<style>\n.humidex-calculator {\n  width: 100%;\n  max-width: 520px;\n  margin: 30px auto;\n  padding: 28px;\n  box-sizing: border-box;\n  text-align: center;\n  font-family: Arial, sans-serif;\n  background: #f2f9ff;\n  border: 2px solid #1683c5;\n  border-radius: 16px;\n  box-shadow: 0 5px 18px rgba(0, 0, 0, 0.12);\n}\n\n.humidex-calculator h3 {\n  margin: 0 0 10px;\n  color: #075985;\n  font-size: 26px;\n}\n\n.humidex-intro {\n  margin: 0 0 24px;\n  color: #374151;\n  line-height: 1.5;\n}\n\n.humidex-field {\n  margin-bottom: 18px;\n}\n\n.humidex-field label {\n  display: block;\n  margin-bottom: 7px;\n  color: #1f2937;\n  font-weight: bold;\n}\n\n.humidex-input {\n  display: flex;\n  align-items: center;\n  justify-content: center;\n  gap: 10px;\n}\n\n.humidex-input input {\n  width: 180px;\n  padding: 12px;\n  box-sizing: border-box;\n  text-align: center;\n  font-size: 18px;\n  border: 1px solid #94a3b8;\n  border-radius: 8px;\n}\n\n.humidex-input input:focus {\n  border-color: #1683c5;\n  outline: 3px solid rgba(22, 131, 197, 0.18);\n}\n\n.humidex-input span {\n  width: 35px;\n  text-align: left;\n  font-size: 18px;\n  font-weight: bold;\n}\n\n#humidex-button {\n  margin-top: 5px;\n  padding: 13px 24px;\n  color: #ffffff;\n  font-size: 17px;\n  font-weight: bold;\n  background: #1683c5;\n  border: 0;\n  border-radius: 8px;\n  cursor: pointer;\n}\n\n#humidex-button:hover {\n  background: #086b9f;\n}\n\n.humidex-result {\n  margin-top: 24px;\n  padding: 18px;\n  color: #ffffff;\n  background: #075985;\n  border-radius: 12px;\n}\n\n.humidex-result span {\n  display: block;\n  font-size: 18px;\n}\n\n.humidex-result strong {\n  display: block;\n  margin: 5px 0;\n  font-size: 42px;\n}\n\n#humidex-level {\n  font-size: 16px;\n  font-weight: bold;\n}\n\n.humidex-error {\n  min-height: 20px;\n  margin: 12px 0 0;\n  color: #b91c1c;\n  font-weight: bold;\n}\n\n.humidex-note {\n  margin: 10px 0 0;\n  color: #4b5563;\n  font-size: 13px;\n  font-style: italic;\n}\n\n@media (max-width: 600px) {\n  .humidex-calculator {\n    padding: 22px 15px;\n  }\n\n  .humidex-calculator h3 {\n    font-size: 22px;\n  }\n}\n<\/style>\n\n<script>\n(function () {\n  const temperatureInput = document.getElementById(\"humidex-temperature\");\n  const humidityInput = document.getElementById(\"humidex-humidity\");\n  const button = document.getElementById(\"humidex-button\");\n  const valueElement = document.getElementById(\"humidex-value\");\n  const levelElement = document.getElementById(\"humidex-level\");\n  const resultElement = document.querySelector(\".humidex-result\");\n  const errorElement = document.getElementById(\"humidex-error\");\n\n  function calculateHumidex() {\n    const temperatureText = temperatureInput.value.trim();\n    const humidityText = humidityInput.value.trim();\n\n    if (temperatureText.includes(\",\") || humidityText.includes(\",\")) {\n      errorElement.textContent =\n        \"Utilisez un point pour les valeurs d\u00e9cimales, par exemple 30.5.\";\n      return;\n    }\n\n    const temperature = Number(temperatureText);\n    const humidity = Number(humidityText);\n\n    if (\n      temperatureText === \"\" ||\n      humidityText === \"\" ||\n      !Number.isFinite(temperature) ||\n      !Number.isFinite(humidity)\n    ) {\n      errorElement.textContent =\n        \"Veuillez indiquer la temp\u00e9rature et le taux d\u2019humidit\u00e9.\";\n      return;\n    }\n\n    if (humidity < 1 || humidity > 100) {\n      errorElement.textContent =\n        \"Le taux d\u2019humidit\u00e9 doit \u00eatre compris entre 1 et 100 %.\";\n      return;\n    }\n\n    errorElement.textContent = \"\";\n\n    const vaporPressure =\n      (humidity \/ 100) *\n      6.112 *\n      Math.exp((17.67 * temperature) \/ (temperature + 243.5));\n\n    const humidex =\n      temperature + (5 \/ 9) * (vaporPressure - 10);\n\n    const roundedHumidex = Math.round(humidex * 10) \/ 10;\n\n    let level;\n    let color;\n\n    if (roundedHumidex < 25) {\n      level = \"Frais ou agr\u00e9able\";\n      color = \"#1683c5\";\n    } else if (roundedHumidex < 30) {\n      level = \"Aucun inconfort\";\n      color = \"#159447\";\n    } else if (roundedHumidex < 35) {\n      level = \"Inconfort l\u00e9ger\";\n      color = \"#ca8a04\";\n    } else if (roundedHumidex < 40) {\n      level = \"Inconfort g\u00e9n\u00e9ralis\u00e9\";\n      color = \"#ea580c\";\n    } else if (roundedHumidex < 45) {\n      level = \"Danger : \u00e9vitez les efforts\";\n      color = \"#dc2626\";\n    } else {\n      level = \"Danger extr\u00eame\";\n      color = \"#7f1d1d\";\n    }\n\n    valueElement.textContent = roundedHumidex.toFixed(1);\n    levelElement.textContent = level;\n    resultElement.style.backgroundColor = color;\n  }\n\n  button.addEventListener(\"click\", calculateHumidex);\n\n  [temperatureInput, humidityInput].forEach(function (input) {\n    input.addEventListener(\"keydown\", function (event) {\n      if (event.key === \"Enter\") {\n        calculateHumidex();\n      }\n    });\n  });\n})();\n<\/script><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-8902396130105212\"\n     crossorigin=\"anonymous\"><\/script>\n<!-- bas de page -->\n<ins class=\"adsbygoogle\"\n     style=\"display:block\"\n     data-ad-client=\"ca-pub-8902396130105212\"\n     data-ad-slot=\"7724440717\"\n     data-ad-format=\"auto\"\n     data-full-width-responsive=\"true\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><div class=\"fusion-text fusion-text-2\"><\/div><div class=\"fusion-text fusion-text-3\"><\/div><div class=\"fusion-text fusion-text-4\"><h2 id=\"faq-humidex-10-questions\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-lg first:mt-0 md:text-lg [hr+&]:mt-4\">FAQ humidex (10 questions)<\/h2>\n<h2 id=\"1-quest-ce-que-lindice-humidex\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0\">1. Qu'est-ce que l'indice humidex ?<\/h2>\n<p class=\"my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top\">L'indice humidex est un indicateur d\u00e9velopp\u00e9 par les m\u00e9t\u00e9orologues canadiens pour traduire la sensation de chaleur en combinant la temp\u00e9rature de l'air et l'humidit\u00e9. Il exprime une temp\u00e9rature \u00ab ressentie \u00bb qui tient compte du fait qu'un air tr\u00e8s humide rend la chaleur plus difficile \u00e0 supporter qu'un air sec.<span class=\"citation inline\" data-pplx-citation=\"\" data-pplx-citation-url=\"https:\/\/www.infoclimat.fr\/lexique-definition-410-humidex.html\"><span class=\"group\/trigger inline-flex min-w-0\" data-state=\"closed\"><span class=\"relative -mt-px max-w-full min-w-0 whitespace-nowrap -top-px font-sans text-base text-foreground select-none selection:bg-super\/50 selection:text-foreground dark:selection:bg-super\/10 dark:selection:text-super\"><span class=\"text-3xs rounded-badge group min-w-4 max-w-full cursor-pointer align-middle font-mono tabular-nums font-normal transition-colors duration-150 inline-flex items-center gap-0 py-[0.1875rem] leading-snug px-[0.3rem] [@media(hover:hover)]:hover:bg-subtle group-data-[state=open]\/trigger:bg-subtle border-subtlest ring-subtlest divide-subtlest bg-quiet\"><span class=\"inline-block relative !mt-0 ![vertical-align:unset] max-w-[25ch] overflow-hidden\">infoclimat<\/span><span class=\"inline-block ml-xs mr-px !mt-0 ![vertical-align:unset]\"><span class=\"opacity-50\">+1<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<h2 id=\"2-comment-calculeton-lhumidex--partir-de-la-tempra\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0\">2. Comment calcule\u2011t\u2011on l'humidex \u00e0 partir de la temp\u00e9rature et de l'humidit\u00e9 ?<\/h2>\n<p class=\"my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top\">L'humidex se calcule en ajoutant \u00e0 la temp\u00e9rature de l'air <span class=\"katex\"><span class=\"katex-mathml\">TT<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">T<\/span><\/span><\/span><\/span> un terme d'ajustement <span class=\"katex\"><span class=\"katex-mathml\">hh<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">h<\/span><\/span><\/span><\/span> li\u00e9 \u00e0 la pression de vapeur d'eau <span class=\"katex\"><span class=\"katex-mathml\">ee<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">e<\/span><\/span><\/span><\/span>, selon la formule <span class=\"katex\"><span class=\"katex-mathml\">Humidex=T+0,5555\u00d7(e\u221210)Humidex = T + 05555 \\times (e \u2013 10)<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">H<\/span><span class=\"mord mathnormal\">u<\/span><span class=\"mord mathnormal\">mi<\/span><span class=\"mord mathnormal\">d<\/span><span class=\"mord mathnormal\">e<\/span><span class=\"mord mathnormal\">x<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord mathnormal\">T<\/span><span class=\"mbin\">+<\/span><\/span><span class=\"base\"><span class=\"mord\">0<\/span><span class=\"mord\"><span class=\"mpunct\">,<\/span><\/span><span class=\"mord\">5555<\/span><span class=\"mbin\">\u00d7<\/span><\/span><span class=\"base\"><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">e<\/span><span class=\"mbin\">\u2212<\/span><\/span><span class=\"base\"><span class=\"mord\">10<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span>. La pression de vapeur <span class=\"katex\"><span class=\"katex-mathml\">ee<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">e<\/span><\/span><\/span><\/span> est elle\u2011m\u00eame obtenue \u00e0 partir du point de ros\u00e9e ou de l'humidit\u00e9 relative, ce que r\u00e9alisent automatiquement la plupart des calculateurs en ligne d'humidex.<span class=\"citation inline\" data-pplx-citation=\"\" data-pplx-citation-url=\"https:\/\/www.netatmo.com\/en-eu\/weather-guide\/humidex\"><span class=\"group\/trigger inline-flex min-w-0\" data-state=\"closed\"><span class=\"relative -mt-px max-w-full min-w-0 whitespace-nowrap -top-px font-sans text-base text-foreground select-none selection:bg-super\/50 selection:text-foreground dark:selection:bg-super\/10 dark:selection:text-super\"><span class=\"text-3xs rounded-badge group min-w-4 max-w-full cursor-pointer align-middle font-mono tabular-nums font-normal transition-colors duration-150 inline-flex items-center gap-0 py-[0.1875rem] leading-snug px-[0.3rem] [@media(hover:hover)]:hover:bg-subtle group-data-[state=open]\/trigger:bg-subtle border-subtlest ring-subtlest divide-subtlest bg-quiet\"><span class=\"inline-block relative !mt-0 ![vertical-align:unset] max-w-[25ch] overflow-hidden\">netatmo<\/span><span class=\"inline-block ml-xs mr-px !mt-0 ![vertical-align:unset]\"><span class=\"opacity-50\">+3<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<h2 id=\"3--partir-de-quelle-valeur-lhumidex-devientil-inco\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0\">3. \u00c0 partir de quelle valeur l'humidex devient\u2011il inconfortable ou dangereux ?<\/h2>\n<p class=\"my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top\">En environnement canadien, un humidex inf\u00e9rieur \u00e0 30 est g\u00e9n\u00e9ralement consid\u00e9r\u00e9 comme confortable, entre 30 et 39 il provoque un certain inconfort, entre 40 et 45 il entra\u00eene un fort inconfort et impose de limiter les efforts. Au\u2011del\u00e0 de 45 l'humidex est jug\u00e9 dangereux, et au\u2011dessus de 54 le risque de coup de chaleur est consid\u00e9r\u00e9 comme imminent pour les personnes expos\u00e9es.<span class=\"citation inline\" data-pplx-citation=\"\" data-pplx-citation-url=\"https:\/\/www.meteociel.fr\/observations-meteo\/humidex.php\"><span class=\"group\/trigger inline-flex min-w-0\" data-state=\"closed\"><span class=\"relative -mt-px max-w-full min-w-0 whitespace-nowrap -top-px font-sans text-base text-foreground select-none selection:bg-super\/50 selection:text-foreground dark:selection:bg-super\/10 dark:selection:text-super\"><span class=\"text-3xs rounded-badge group min-w-4 max-w-full cursor-pointer align-middle font-mono tabular-nums font-normal transition-colors duration-150 inline-flex items-center gap-0 py-[0.1875rem] leading-snug px-[0.3rem] [@media(hover:hover)]:hover:bg-subtle group-data-[state=open]\/trigger:bg-subtle border-subtlest ring-subtlest divide-subtlest bg-quiet\"><span class=\"inline-block relative !mt-0 ![vertical-align:unset] max-w-[25ch] overflow-hidden\">meteociel<\/span><span class=\"inline-block ml-xs mr-px !mt-0 ![vertical-align:unset]\"><span class=\"opacity-50\">+3<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<h2 id=\"4-quelle-diffrence-entre-lhumidex-et-la--tempratur\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0\">4. Quelle diff\u00e9rence entre l'humidex et la \u00ab temp\u00e9rature ressentie \u00bb classique ?<\/h2>\n<p class=\"my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top\">La \u00ab temp\u00e9rature ressentie \u00bb communiqu\u00e9e au grand public peut regrouper plusieurs indices, alors que l'humidex est sp\u00e9cifiquement centr\u00e9 sur la combinaison chaleur\u2011humidit\u00e9, sans int\u00e9grer le vent. Contrairement au refroidissement \u00e9olien (windchill) qui s'applique au temps froid, l'humidex s'applique au temps chaud et humide pour qualifier l'inconfort thermique de mani\u00e8re plus pr\u00e9cise que la seule temp\u00e9rature sous abri.<span class=\"citation inline\" data-pplx-citation=\"\" data-pplx-citation-url=\"https:\/\/www.meteociel.fr\/observations-meteo\/humidex.php\"><span class=\"group\/trigger inline-flex min-w-0\" data-state=\"closed\"><span class=\"relative -mt-px max-w-full min-w-0 whitespace-nowrap -top-px font-sans text-base text-foreground select-none selection:bg-super\/50 selection:text-foreground dark:selection:bg-super\/10 dark:selection:text-super\"><span class=\"text-3xs rounded-badge group min-w-4 max-w-full cursor-pointer align-middle font-mono tabular-nums font-normal transition-colors duration-150 inline-flex items-center gap-0 py-[0.1875rem] leading-snug px-[0.3rem] [@media(hover:hover)]:hover:bg-subtle group-data-[state=open]\/trigger:bg-subtle border-subtlest ring-subtlest divide-subtlest bg-quiet\"><span class=\"inline-block relative !mt-0 ![vertical-align:unset] max-w-[25ch] overflow-hidden\">meteociel<\/span><span class=\"inline-block ml-xs mr-px !mt-0 ![vertical-align:unset]\"><span class=\"opacity-50\">+2<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<h2 id=\"5-lhumidex-estil-utilis-en-france-sur-les-cartes-m\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0\">5. L'humidex est\u2011il utilis\u00e9 en France sur les cartes m\u00e9t\u00e9o ?<\/h2>\n<p class=\"my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top\">M\u00eame s'il est n\u00e9 au Canada, l'humidex est aujourd'hui repris par plusieurs sites d'observation et de passionn\u00e9s en France pour illustrer les \u00e9pisodes de chaleur lourde. Il appara\u00eet notamment sur certaines cartes d'observation temps r\u00e9el, ce qui permet au public de comprendre pourquoi deux journ\u00e9es \u00e0 30 \u00b0C peuvent \u00eatre ressenties de fa\u00e7on tr\u00e8s diff\u00e9rente selon le degr\u00e9 d'humidit\u00e9.<span class=\"citation inline\" data-pplx-citation=\"\" data-pplx-citation-url=\"https:\/\/www.geo.fr\/environnement\/climat-indice-humidex-chaleur-thermometre-mouille-205224\"><span class=\"group\/trigger inline-flex min-w-0\" data-state=\"closed\"><span class=\"relative -mt-px max-w-full min-w-0 whitespace-nowrap -top-px font-sans text-base text-foreground select-none selection:bg-super\/50 selection:text-foreground dark:selection:bg-super\/10 dark:selection:text-super\"><span class=\"text-3xs rounded-badge group min-w-4 max-w-full cursor-pointer align-middle font-mono tabular-nums font-normal transition-colors duration-150 inline-flex items-center gap-0 py-[0.1875rem] leading-snug px-[0.3rem] [@media(hover:hover)]:hover:bg-subtle group-data-[state=open]\/trigger:bg-subtle border-subtlest ring-subtlest divide-subtlest bg-quiet\"><span class=\"inline-block relative !mt-0 ![vertical-align:unset] max-w-[25ch] overflow-hidden\">geo<\/span><span class=\"inline-block ml-xs mr-px !mt-0 ![vertical-align:unset]\"><span class=\"opacity-50\">+2<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<h2 id=\"6-quels-risques-pour-la-sant-sont-associs--un-humi\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0\">6. Quels risques pour la sant\u00e9 sont associ\u00e9s \u00e0 un humidex \u00e9lev\u00e9 ?<\/h2>\n<p class=\"my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top\">Un humidex sup\u00e9rieur \u00e0 40 indique un fort inconfort et un risque accru de d\u00e9shydratation, de malaise et de coup de chaleur chez les personnes sensibles ou expos\u00e9es. Lorsque les valeurs d\u00e9passent 45 \u00e0 54, les autorit\u00e9s canadiennes consid\u00e8rent la situation comme dangereuse et \u00e9voquent un risque de coup de chaleur imminent, ce qui justifie une r\u00e9duction des activit\u00e9s physiques et une vigilance hydratation accrue.<span class=\"citation inline\" data-pplx-citation=\"\" data-pplx-citation-url=\"https:\/\/www.canada.ca\/en\/services\/environment\/weather\/severeweather\/humidex.html\"><span class=\"group\/trigger inline-flex min-w-0\" data-state=\"closed\"><span class=\"relative -mt-px max-w-full min-w-0 whitespace-nowrap -top-px font-sans text-base text-foreground select-none selection:bg-super\/50 selection:text-foreground dark:selection:bg-super\/10 dark:selection:text-super\"><span class=\"text-3xs rounded-badge group min-w-4 max-w-full cursor-pointer align-middle font-mono tabular-nums font-normal transition-colors duration-150 inline-flex items-center gap-0 py-[0.1875rem] leading-snug px-[0.3rem] [@media(hover:hover)]:hover:bg-subtle group-data-[state=open]\/trigger:bg-subtle border-subtlest ring-subtlest divide-subtlest bg-quiet\"><span class=\"inline-block relative !mt-0 ![vertical-align:unset] max-w-[25ch] overflow-hidden\">canada<\/span><span class=\"inline-block ml-xs mr-px !mt-0 ![vertical-align:unset]\"><span class=\"opacity-50\">+3<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<h2 id=\"7-comment-interprter-lhumidex-pour-adapter-ses-act\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0\">7. Comment interpr\u00e9ter l'humidex pour adapter ses activit\u00e9s en \u00e9t\u00e9 ?<\/h2>\n<p class=\"my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top\">Un humidex inf\u00e9rieur \u00e0 30 autorise g\u00e9n\u00e9ralement les activit\u00e9s ext\u00e9rieures avec des pr\u00e9cautions classiques, alors qu'entre 30 et 39 il convient d\u00e9j\u00e0 de pr\u00e9voir des pauses et une bonne hydratation. Au\u2011del\u00e0 de 40, il devient affirmatif de recommander d'\u00e9viter les efforts intenses en plein soleil, de privil\u00e9gier les heures plus fra\u00eeches et de surveiller particuli\u00e8rement les enfants, les personnes \u00e2g\u00e9es et les travailleurs en ext\u00e9rieur.<span class=\"citation inline\" data-pplx-citation=\"\" data-pplx-citation-url=\"https:\/\/www.canada.ca\/en\/services\/environment\/weather\/severeweather\/humidex.html\"><span class=\"group\/trigger inline-flex min-w-0\" data-state=\"closed\"><span class=\"relative -mt-px max-w-full min-w-0 whitespace-nowrap -top-px font-sans text-base text-foreground select-none selection:bg-super\/50 selection:text-foreground dark:selection:bg-super\/10 dark:selection:text-super\"><span class=\"text-3xs rounded-badge group min-w-4 max-w-full cursor-pointer align-middle font-mono tabular-nums font-normal transition-colors duration-150 inline-flex items-center gap-0 py-[0.1875rem] leading-snug px-[0.3rem] [@media(hover:hover)]:hover:bg-subtle group-data-[state=open]\/trigger:bg-subtle border-subtlest ring-subtlest divide-subtlest bg-quiet\"><span class=\"inline-block relative !mt-0 ![vertical-align:unset] max-w-[25ch] overflow-hidden\">canada<\/span><span class=\"inline-block ml-xs mr-px !mt-0 ![vertical-align:unset]\"><span class=\"opacity-50\">+3<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<h2 id=\"8-pourquoi-un-air-humide-rendil-la-chaleur-plus-di\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0\">8. Pourquoi un air humide rend\u2011il la chaleur plus difficile \u00e0 supporter ?<\/h2>\n<p class=\"my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top\">Un air humide ralentit l'\u00e9vaporation de la sueur, ce qui diminue l'efficacit\u00e9 du principal m\u00e9canisme de refroidissement du corps humain. Lorsque la pression de vapeur d'eau est \u00e9lev\u00e9e, la chaleur s'accumule plus facilement dans l'organisme et l'humidex int\u00e8gre cette \u00ab charge \u00bb suppl\u00e9mentaire pour refl\u00e9ter une sensation de chaleur nettement plus lourde \u00e0 intensit\u00e9 thermique \u00e9gale.<span class=\"citation inline\" data-pplx-citation=\"\" data-pplx-citation-url=\"https:\/\/es.wikipedia.org\/wiki\/Humidex\"><span class=\"group\/trigger inline-flex min-w-0\" data-state=\"closed\"><span class=\"relative -mt-px max-w-full min-w-0 whitespace-nowrap -top-px font-sans text-base text-foreground select-none selection:bg-super\/50 selection:text-foreground dark:selection:bg-super\/10 dark:selection:text-super\"><span class=\"text-3xs rounded-badge group min-w-4 max-w-full cursor-pointer align-middle font-mono tabular-nums font-normal transition-colors duration-150 inline-flex items-center gap-0 py-[0.1875rem] leading-snug px-[0.3rem] [@media(hover:hover)]:hover:bg-subtle group-data-[state=open]\/trigger:bg-subtle border-subtlest ring-subtlest divide-subtlest bg-quiet\"><span class=\"inline-block relative !mt-0 ![vertical-align:unset] max-w-[25ch] overflow-hidden\">wikipedia<\/span><span class=\"inline-block ml-xs mr-px !mt-0 ![vertical-align:unset]\"><span class=\"opacity-50\">+3<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<h2 id=\"9-lhumidex-estil-identique--lindice-de-chaleur-uti\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0\">9. L'humidex est\u2011il identique \u00e0 l'indice de chaleur utilis\u00e9 aux \u00c9tats\u2011Unis ?<\/h2>\n<p class=\"my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top\">L'humidex poursuit le m\u00eame objectif que l'indice de chaleur am\u00e9ricain, mais il repose sur une formulation diff\u00e9rente et s'appuie principalement sur le point de ros\u00e9e pour repr\u00e9senter l'humidit\u00e9. Les deux indices donnent des valeurs comparables pour d\u00e9crire l'inconfort par temps chaud et humide, mais l'humidex est traditionnellement la r\u00e9f\u00e9rence au Canada et dans certains contenus m\u00e9t\u00e9orologiques francophones.<span class=\"citation inline\" data-pplx-citation=\"\" data-pplx-citation-url=\"https:\/\/en.wikipedia.org\/wiki\/Humidex\"><span class=\"group\/trigger inline-flex min-w-0\" data-state=\"closed\"><span class=\"relative -mt-px max-w-full min-w-0 whitespace-nowrap -top-px font-sans text-base text-foreground select-none selection:bg-super\/50 selection:text-foreground dark:selection:bg-super\/10 dark:selection:text-super\"><span class=\"text-3xs rounded-badge group min-w-4 max-w-full cursor-pointer align-middle font-mono tabular-nums font-normal transition-colors duration-150 inline-flex items-center gap-0 py-[0.1875rem] leading-snug px-[0.3rem] [@media(hover:hover)]:hover:bg-subtle group-data-[state=open]\/trigger:bg-subtle border-subtlest ring-subtlest divide-subtlest bg-quiet\"><span class=\"inline-block relative !mt-0 ![vertical-align:unset] max-w-[25ch] overflow-hidden\">wikipedia<\/span><span class=\"inline-block ml-xs mr-px !mt-0 ![vertical-align:unset]\"><span class=\"opacity-50\">+3<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<h2 id=\"10-lhumidex-tientil-compte-du-vent-de-lensoleillem\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&]:clear-end text-base first:mt-0\">10. L'humidex tient\u2011il compte du vent, de l'ensoleillement ou de l'activit\u00e9 physique ?<\/h2>\n<p class=\"my-2 [&+p]:mt-4 [&_strong:has(+br)]:inline-block [&_strong:has(+br)]:align-top\">L'humidex ne prend pas explicitement en compte le vent ni le rayonnement solaire, il se limite \u00e0 la temp\u00e9rature de l'air et \u00e0 la charge en vapeur d'eau. Le rayonnement, le vent, le niveau d'effort et l'\u00e9tat de sant\u00e9 peuvent donc aggraver ou att\u00e9nuer la situation r\u00e9elle par rapport \u00e0 la valeur d'humidex, qui doit \u00eatre interpr\u00e9t\u00e9e comme un indicateur simplifi\u00e9 de confort et de risque en ambiance chaude et humide.<\/p>\n<\/div><div class=\"fusion-text fusion-text-5\"><p>Source : www.meteofrance.com<\/p>\n<\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":14485,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_seopress_titles_title":"Humidex, calcul, inconfort et risque de coup de chaleur","_seopress_titles_desc":"D\u00e9couvrez comment l\u2019indice humidex combine chaleur et humidit\u00e9, comment le calculer et interpr\u00e9ter les cartes m\u00e9t\u00e9o en France pour anticiper l\u2019inconfort et les coups de chaleur estivaux.","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"both","_seopress_redirections_param":"","_seopress_redirections_type":301,"_seopress_analysis_target_kw":"temperature mer","footnotes":""},"class_list":["post-60454","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/pages\/60454","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/comments?post=60454"}],"version-history":[{"count":1,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/pages\/60454\/revisions"}],"predecessor-version":[{"id":60455,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/pages\/60454\/revisions\/60455"}],"up":[{"embeddable":true,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/pages\/14485"}],"wp:attachment":[{"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/media?parent=60454"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}