{"id":60978,"date":"2026-07-27T22:13:31","date_gmt":"2026-07-27T20:13:31","guid":{"rendered":"https:\/\/alertes-meteo.com\/?p=60978"},"modified":"2026-07-27T22:14:37","modified_gmt":"2026-07-27T20:14:37","slug":"ecart-a-la-moyenne-des-temperatures-en-mars-depuis-1921-en-france-une-transition-printaniere-de-plus-en-plus-douce","status":"publish","type":"post","link":"https:\/\/alertes-meteo.com\/index.php\/2026\/07\/27\/ecart-a-la-moyenne-des-temperatures-en-mars-depuis-1921-en-france-une-transition-printaniere-de-plus-en-plus-douce\/","title":{"rendered":"\u00c9cart \u00e0 la moyenne des temp\u00e9ratures en mars depuis 1921 en France : une transition printani\u00e8re de plus en plus douce"},"content":{"rendered":"
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\u00c9cart \u00e0 la moyenne des temp\u00e9ratures en mars depuis 1921 (France)<\/h2>\n

Normale de r\u00e9f\u00e9rence 1991-2020<\/p>\n <\/div>\n\n

\n Cliquez sur une barre pour afficher l\u2019ann\u00e9e et l\u2019\u00e9cart \u00e0 la normale.\n <\/div>\n\n
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\n \n Anomalies de temp\u00e9rature en mars en France, de 1921 \u00e0 2026<\/title>\n <desc id=\"amm-desc\">\n Histogramme des \u00e9carts \u00e0 la normale 1991-2020. Les valeurs positives sont rouges\n et les valeurs n\u00e9gatives sont bleues. Chaque barre est interactive.\n <\/desc>\n <\/svg>\n <div class=\"amm-tooltip\" data-amm-tooltip role=\"status\" aria-hidden=\"true\"><\/div>\n <\/div>\n <\/div>\n\n <div class=\"amm-legend\" aria-label=\"L\u00e9gende\">\n <span><i class=\"amm-dot amm-dot-positive\"><\/i> Plus chaud que la normale<\/span>\n <span><i class=\"amm-dot amm-dot-negative\"><\/i> Plus froid que la normale<\/span>\n <\/div>\n\n <p class=\"amm-source\">Source : M\u00e9t\u00e9o-France \u2022 Normale climatologique 1991-2020<\/p>\n<\/div>\n\n<style>\n .amm-widget,\n .amm-widget * {\n box-sizing: border-box;\n }\n\n .amm-widget {\n --amm-red: #e85236;\n --amm-red-dark: #bd321d;\n --amm-blue: #5c9ae3;\n --amm-blue-dark: #2567b3;\n --amm-grid: #dfe4ea;\n --amm-ink: #17202a;\n --amm-muted: #59636e;\n width: 100%;\n max-width: 1180px;\n margin: 24px auto;\n padding: clamp(18px, 3vw, 32px);\n overflow: hidden;\n color: var(--amm-ink);\n background: #ffffff;\n border: 1px solid #e8ebef;\n border-radius: 18px;\n box-shadow: 0 12px 34px rgba(23, 32, 42, 0.09);\n font-family: Arial, Helvetica, sans-serif;\n }\n\n .amm-header h2 {\n margin: 0;\n font-size: clamp(21px, 2.6vw, 31px);\n line-height: 1.18;\n letter-spacing: -0.02em;\n }\n\n .amm-header p {\n margin: 8px 0 0;\n color: var(--amm-muted);\n font-size: 15px;\n }\n\n .amm-selection {\n min-height: 49px;\n margin: 20px 0 12px;\n padding: 12px 15px;\n color: #34404c;\n background: #f5f7fa;\n border-left: 4px solid #8995a3;\n border-radius: 9px;\n font-size: 15px;\n line-height: 1.4;\n }\n\n .amm-selection strong {\n color: var(--amm-ink);\n }\n\n .amm-selection.is-positive {\n background: #fff3f0;\n border-left-color: var(--amm-red);\n }\n\n .amm-selection.is-negative {\n background: #eff6ff;\n border-left-color: var(--amm-blue);\n }\n\n .amm-selection.is-neutral {\n background: #f5f7fa;\n border-left-color: #707b86;\n }\n\n .amm-scroll {\n width: 100%;\n overflow-x: auto;\n overflow-y: hidden;\n scrollbar-color: #aeb7c2 #edf0f3;\n scrollbar-width: thin;\n -webkit-overflow-scrolling: touch;\n }\n\n .amm-stage {\n position: relative;\n width: 100%;\n min-width: 900px;\n }\n\n .amm-svg {\n display: block;\n width: 100%;\n height: auto;\n overflow: visible;\n touch-action: pan-x pan-y;\n }\n\n .amm-grid-line {\n stroke: var(--amm-grid);\n stroke-width: 1;\n vector-effect: non-scaling-stroke;\n }\n\n .amm-zero-line {\n stroke: #1c2732;\n stroke-width: 1.7;\n vector-effect: non-scaling-stroke;\n }\n\n .amm-y-label,\n .amm-x-label,\n .amm-axis-unit {\n fill: #68727d;\n font-family: Arial, Helvetica, sans-serif;\n }\n\n .amm-y-label {\n font-size: 13px;\n text-anchor: end;\n dominant-baseline: middle;\n }\n\n .amm-x-label {\n font-size: 11px;\n text-anchor: middle;\n }\n\n .amm-axis-unit {\n font-size: 12px;\n font-weight: 700;\n }\n\n .amm-bar {\n cursor: pointer;\n outline: none;\n }\n\n .amm-bar-visible {\n transition: opacity 0.14s ease, filter 0.14s ease;\n shape-rendering: geometricPrecision;\n }\n\n .amm-bar:hover .amm-bar-visible,\n .amm-bar:focus .amm-bar-visible,\n .amm-bar.is-selected .amm-bar-visible {\n opacity: 1;\n filter: brightness(0.83);\n }\n\n .amm-bar:focus-visible .amm-bar-visible {\n stroke: #111820;\n stroke-width: 2;\n vector-effect: non-scaling-stroke;\n }\n\n .amm-hit-area {\n fill: transparent;\n pointer-events: all;\n }\n\n .amm-tooltip {\n position: absolute;\n z-index: 4;\n width: max-content;\n max-width: 235px;\n padding: 10px 12px;\n color: #ffffff;\n background: rgba(18, 25, 33, 0.96);\n border-radius: 9px;\n box-shadow: 0 8px 24px rgba(0, 0, 0, 0.22);\n font-size: 13px;\n line-height: 1.35;\n pointer-events: none;\n opacity: 0;\n transform: translate(-50%, calc(-100% - 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120, clientX - rect.left));\n const tooltipY = Math.max(82, clientY - rect.top);\n\n tooltip.innerHTML =\n `<strong>Mars ${year}<\/strong>` +\n `<span>\u00c9cart \u00e0 la normale : ${formatValue(value)} \u00b0C<\/span>`;\n tooltip.style.left = `${tooltipX}px`;\n tooltip.style.top = `${tooltipY}px`;\n tooltip.classList.add(\"is-visible\");\n tooltip.setAttribute(\"aria-hidden\", \"false\");\n };\n\n const hideTooltip = () => {\n tooltip.classList.remove(\"is-visible\");\n tooltip.setAttribute(\"aria-hidden\", \"true\");\n };\n\n data.forEach(([year, value], index) => {\n const x = margin.left + index * slot + (slot - barW) \/ 2;\n const valueY = y(value);\n const rectY = value >= 0 ? valueY : zeroY;\n const rectH = Math.max(1.2, Math.abs(zeroY - valueY));\n const color = value >= 0 ? \"#e85236\" : \"#5c9ae3\";\n\n const group = makeSvg(\"g\", {\n class: \"amm-bar\",\n role: \"button\",\n tabindex: \"0\",\n \"aria-label\": `Mars ${year}, \u00e9cart \u00e0 la normale ${formatValue(value)} degr\u00e9 Celsius`\n });\n\n const visibleBar = makeSvg(\"rect\", {\n x,\n y: rectY,\n width: barW,\n height: rectH,\n rx: 0.8,\n fill: color,\n class: \"amm-bar-visible\"\n });\n\n const hitArea = makeSvg(\"rect\", {\n x: margin.left + index * slot,\n y: margin.top,\n width: slot,\n height: plotH,\n class: \"amm-hit-area\"\n });\n\n group.appendChild(visibleBar);\n group.appendChild(hitArea);\n\n group.addEventListener(\"pointerenter\", (event) => {\n if (!pinnedBar) placeTooltip(event.clientX, event.clientY, year, value);\n });\n\n group.addEventListener(\"pointermove\", (event) => {\n if (!pinnedBar) placeTooltip(event.clientX, event.clientY, year, value);\n });\n\n group.addEventListener(\"pointerleave\", () => {\n if (!pinnedBar) hideTooltip();\n });\n\n const selectBar = (event) => {\n event.preventDefault();\n event.stopPropagation();\n removeSelection();\n pinnedBar = group;\n group.classList.add(\"is-selected\");\n setSelectionCard(year, value);\n\n const barBox = visibleBar.getBoundingClientRect();\n placeTooltip(\n barBox.left + barBox.width \/ 2,\n Math.min(barBox.top, barBox.bottom),\n year,\n value\n );\n };\n\n group.addEventListener(\"click\", selectBar);\n group.addEventListener(\"keydown\", (event) => {\n if (event.key === \"Enter\" || event.key === \" \") selectBar(event);\n if (event.key === \"Escape\") {\n removeSelection();\n hideTooltip();\n }\n });\n\n barsGroup.appendChild(group);\n });\n\n svg.appendChild(barsGroup);\n\n const labelsGroup = makeSvg(\"g\", { \"aria-hidden\": \"true\" });\n data.forEach(([year], index) => {\n if (year % 5 !== 0) return;\n const label = makeSvg(\"text\", {\n x: margin.left + index * slot + slot \/ 2,\n y: H - 25,\n class: \"amm-x-label\"\n });\n label.textContent = year;\n labelsGroup.appendChild(label);\n });\n svg.appendChild(labelsGroup);\n\n svg.addEventListener(\"click\", (event) => {\n if (event.target === svg || event.target.classList.contains(\"amm-grid-line\")) {\n removeSelection();\n hideTooltip();\n }\n });\n });\n })();\n<\/script><div class=\"fusion-text fusion-text-1\"><p>Le mois de mars marque la transition entre l’hiver et le printemps. Cette p\u00e9riode est souvent caract\u00e9ris\u00e9e par une forte variabilit\u00e9 m\u00e9t\u00e9orologique, alternant douceur, gel\u00e9es tardives et \u00e9pisodes perturb\u00e9s. Pourtant, l’analyse des \u00e9carts \u00e0 la moyenne des temp\u00e9ratures depuis 1921 r\u00e9v\u00e8le une \u00e9volution nette : les mois de mars sont devenus globalement plus doux en France, en lien avec le r\u00e9chauffement climatique observ\u00e9 depuis plusieurs d\u00e9cennies.<\/p>\n<h2>Une hausse progressive des temp\u00e9ratures en mars<\/h2>\n<h3>Des anomalies positives de plus en plus fr\u00e9quentes<\/h3>\n<p>L’\u00e9cart \u00e0 la moyenne, aussi appel\u00e9 <strong>anomalie de temp\u00e9rature<\/strong>, compare la temp\u00e9rature moyenne observ\u00e9e \u00e0 une normale climatique de r\u00e9f\u00e9rence. Entre 1921 et les ann\u00e9es 1980, les mois de mars alternaient r\u00e9guli\u00e8rement entre p\u00e9riodes plus froides et plus douces que la normale.<\/p>\n<p>Depuis les ann\u00e9es 1980, les anomalies positives dominent largement. Les temp\u00e9ratures moyennes de mars d\u00e9passent plus fr\u00e9quemment les normales saisonni\u00e8res, traduisant une tendance durable au r\u00e9chauffement en France.<\/p>\n<h3>Quels sont les impacts de cette \u00e9volution ?<\/h3>\n<p>Des mois de mars plus doux entra\u00eenent plusieurs cons\u00e9quences :<\/p>\n<ul data-spread=\"false\">\n<li>une reprise plus pr\u00e9coce de la v\u00e9g\u00e9tation ;<\/li>\n<li>un risque accru de d\u00e9g\u00e2ts en cas de gel\u00e9es tardives apr\u00e8s un d\u00e9marrage anticip\u00e9 de la floraison ;<\/li>\n<li>une diminution de l’enneigement \u00e0 moyenne altitude ;<\/li>\n<li>des modifications des cycles biologiques de nombreuses esp\u00e8ces.<\/li>\n<\/ul>\n<p>Ces \u00e9volutions concernent aussi bien les milieux naturels que les activit\u00e9s agricoles et foresti\u00e8res.<\/p>\n<\/div><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\"><h2><\/h2>\n<h2><\/h2>\n<h2><\/h2>\n<h2>Comment interpr\u00e9ter un \u00e9cart \u00e0 la moyenne ?<\/h2>\n<p class=\"isSelectedEnd\">Une anomalie positive signifie que la temp\u00e9rature moyenne du mois est sup\u00e9rieure \u00e0 la normale climatique. Cela n’emp\u00eache pas la survenue de journ\u00e9es froides ou de chutes de neige tardives, encore possibles en mars.<\/p>\n<p class=\"isSelectedEnd\">\u00c0 l’inverse, une anomalie n\u00e9gative indique un mois globalement plus froid que la moyenne, un sc\u00e9nario devenu moins fr\u00e9quent au cours des derni\u00e8res d\u00e9cennies.<\/p>\n<h2>FAQ<\/h2>\n<h3>Qu’est-ce qu’une anomalie de temp\u00e9rature ?<\/h3>\n<p class=\"isSelectedEnd\">C’est la diff\u00e9rence entre la temp\u00e9rature moyenne observ\u00e9e et la normale climatique calcul\u00e9e sur une p\u00e9riode de r\u00e9f\u00e9rence.<\/p>\n<h3>Pourquoi mars se r\u00e9chauffe-t-il ?<\/h3>\n<p class=\"isSelectedEnd\">Cette \u00e9volution s’inscrit dans le contexte du r\u00e9chauffement climatique, qui entra\u00eene une hausse progressive des temp\u00e9ratures moyennes en France.<\/p>\n<h3>Peut-il encore geler en mars ?<\/h3>\n<p class=\"isSelectedEnd\">Oui. Les gel\u00e9es matinales restent possibles, notamment lors de descentes d’air froid en fin d’hiver.<\/p>\n<h3>Depuis quand observe-t-on cette tendance ?<\/h3>\n<p class=\"isSelectedEnd\">La hausse des temp\u00e9ratures devient particuli\u00e8rement visible \u00e0 partir des ann\u00e9es 1980, avec une majorit\u00e9 de mois de mars plus doux que la normale.<\/p>\n<h3>Quelles sont les cons\u00e9quences pour la nature ?<\/h3>\n<p class=\"isSelectedEnd\">Le r\u00e9chauffement favorise une floraison plus pr\u00e9coce, mais augmente aussi la vuln\u00e9rabilit\u00e9 des cultures et des arbres fruitiers aux gel\u00e9es tardives.<\/p>\n<h2>Conclusion<\/h2>\n<p class=\"isSelectedEnd\">L’\u00e9volution des temp\u00e9ratures en mars depuis 1921 montre une augmentation progressive des anomalies positives en France. Malgr\u00e9 une m\u00e9t\u00e9o toujours tr\u00e8s changeante au d\u00e9but du printemps, les donn\u00e9es climatiques confirment une tendance durable \u00e0 l’adoucissement des temp\u00e9ratures.<\/p>\n<h2>Consultez nos analyses climatiques<\/h2>\n<p>Explorez nos graphiques climatiques, nos statistiques m\u00e9t\u00e9o et nos pr\u00e9visions saisonni\u00e8res pour suivre l’\u00e9volution des temp\u00e9ratures en France et mieux comprendre les changements du climat au fil des d\u00e9cennies.<\/p>\n<\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"\u00c9cart \u00e0 la moyenne des temp\u00e9ratures en mars en France depuis 1921 : \u00e9volution et anomalies climatiques","_seopress_titles_desc":"D\u00e9couvrez l'\u00e9volution des temp\u00e9ratures en mars en France depuis 1921 et analysez les \u00e9carts \u00e0 la moyenne qui t\u00e9moignent du r\u00e9chauffement climatique.","_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":"Pyr\u00e9n\u00e9es-Orientales,Pr\u00e9visionM\u00e9t\u00e9o,M\u00c9T\u00c9O DU JOUR","footnotes":""},"categories":[80,170],"tags":[],"class_list":["post-60978","post","type-post","status-publish","format-standard","hentry","category-actualite","category-climatologie"],"_links":{"self":[{"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/posts\/60978","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"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=60978"}],"version-history":[{"count":1,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/posts\/60978\/revisions"}],"predecessor-version":[{"id":60979,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/posts\/60978\/revisions\/60979"}],"wp:attachment":[{"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/media?parent=60978"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/categories?post=60978"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/tags?post=60978"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}