{"id":5244,"date":"2025-09-15T17:06:54","date_gmt":"2025-09-15T15:06:54","guid":{"rendered":"https:\/\/meteo-sain-bel.fr\/wp\/blog\/on-15-septembre-2025-at-15h06-pourquoi-lautomne-meteorologique-ne-debute-pas-a-lequinoxe-dautomne\/"},"modified":"2025-09-15T17:06:54","modified_gmt":"2025-09-15T15:06:54","slug":"on-15-septembre-2025-at-15h06-pourquoi-lautomne-meteorologique-ne-debute-pas-a-lequinoxe-dautomne","status":"publish","type":"post","link":"https:\/\/meteo-sain-bel.fr\/wp\/blog\/on-15-septembre-2025-at-15h06-pourquoi-lautomne-meteorologique-ne-debute-pas-a-lequinoxe-dautomne\/","title":{"rendered":"on 15 septembre 2025 at 15h06  Pourquoi l&#8217;automne m\u00e9t\u00e9orologique ne d\u00e9bute pas \u00e0 l&#8217;\u00e9quinoxe d&#8217;automne ?"},"content":{"rendered":"<p>M\u00e9t\u00e9o\u00a0 Republi\u00e9 via Innoreader <a href=\"https:\/\/www.meteo-paris.com\/actualites\/pourquoi-l-automne-meteorologique-est-different-de-l-automne-astronomique\" target=\"_blank\" class=\"feedzy-rss-link-icon\">Read More<\/a><\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/paris-automne-SIXT-1024x629.jpg\" \/><\/p>\n<h2>Quelques explications sur les saisons<\/h2>\n<p>Tout d&#8217;abord, il est important de rappeler pourquoi nous observons des saisons diff\u00e9rentes sur notre plan\u00e8te. Les changements de saison sont caus\u00e9s par deux ph\u00e9nom\u00e8nes\u00a0: le mouvement de la Terre autour du Soleil et l&#8217;axe de rotation inclin\u00e9 de la Terre.<\/p>\n<p>En effet la Terre tourne sur elle-m\u00eame autour d&#8217;un axe, mais cet axe n&#8217;est pas vertical, il est au contraire inclin\u00e9 \u00e0 23,5\u00b0. R\u00e9sultat, la Terre penche toujours dans la m\u00eame direction dans son orbite autour du Soleil. Ceci veut dire que, selon les moments de l&#8217;ann\u00e9e, diff\u00e9rentes parties de la plan\u00e8te sont inclin\u00e9es vers le Soleil.<\/p>\n<p>Si les saison se produisent \u00e0 diff\u00e9rents moments dans diff\u00e9rentes parties du globe, c&#8217;est \u00e0 cause de la position de la Terre autour du Soleil. En effet, l\u2019h\u00e9misph\u00e8re Nord est inclin\u00e9 \u00e0 l\u2019oppos\u00e9 du Soleil de septembre \u00e0 mars. Ainsi, la moiti\u00e9 nord de la plan\u00e8te re\u00e7oit moins de lumi\u00e8re et de chaleur du Soleil, c\u2019est alors l\u2019automne et l\u2019hiver. Pendant ce temps, c&#8217;est donc l&#8217;\u00e9t\u00e9 sur l&#8217;h\u00e9misph\u00e8re Sud et la situation s&#8217;inverse entre avril et ao\u00fbt.<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/Mouvement_de_la_Terre_autour_du_Soleil_0.png\" \/><\/p>\n<p>Sch\u00e9ma expliquant les diff\u00e9rentes saisons sur Terre \u2013 Parlons Sciences<\/p>\n<p>Ainsi, d&#8217;un point de vue astronomique, une saison correspond \u00e0 l&#8217;intervalle de temps durant lequel la\u00a0Terre\u00a0occupe une portion de l&#8217;espace de sa\u00a0r\u00e9volution (rotation) autour du Soleil. Le passage de l&#8217;hiver au printemps et de l&#8217;\u00e9t\u00e9 \u00e0 l&#8217;automne se d\u00e9roule ainsi lors des \u00e9quinoxes, l&#8217;instant o\u00f9 le Soleil traverse le plan \u00e9quatorial terrestre, changeant ainsi d&#8217;h\u00e9misph\u00e8re c\u00e9leste.<\/p>\n<p>Le passages \u00e0 l&#8217;hiver et \u00e0 l&#8217;\u00e9t\u00e9 se d\u00e9roulent quant \u00e0 eux lors des solstices, c&#8217;est \u00e0 dire lorsque la position apparente du soleil atteint sa plus grande inclinaison vers le nord ou vers le sud, par rapport \u00e0 l&#8217;\u00e9quateur c\u00e9leste.<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/equinoxe-et-solstice.jpg\" \/><\/p>\n<p>Diff\u00e9rences entre \u00e9quinoxe et solstice\u00a0\u2013 Via Calendrier Lunaire<\/p>\n<h2>Pourquoi les saisons astronomiques et les saisons m\u00e9t\u00e9orologiques diff\u00e8rent\u00a0?<\/h2>\n<p>L&#8217;explication est finalement assez simple et est cette fois-ci li\u00e9e \u00e0 l&#8217;atmosph\u00e8re.<\/p>\n<p>En prenant l&#8217;exemple de l&#8217;\u00e9t\u00e9, on note que l&#8217;\u00e9t\u00e9 m\u00e9t\u00e9orologique correspond \u00e0 la p\u00e9riode de l&#8217;ann\u00e9e la plus chaude. Si la dur\u00e9e d&#8217;ensoleillement maximale se situe autour du solstice d&#8217;\u00e9t\u00e9, l&#8217;inertie de l&#8217;atmosph\u00e8re fait que la temp\u00e9rature moyenne atteint g\u00e9n\u00e9ralement son pic trois semaines plus tard environ, c&#8217;est \u00e0 dire \u00e0 la mi-juillet. De ce fait, on consid\u00e8re que ce pic correspond au milieu de l&#8217;\u00e9t\u00e9 en m\u00e9t\u00e9orologie. Logiquement, si le milieu de la saison estivale se situe \u00e0 la mi-juillet, l&#8217;\u00e9t\u00e9 commence d\u00e9but juin et se termine fin ao\u00fbt.<\/p>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/carte%20-%202025-09-15T124009.921.png\" \/><\/p>\n<p><em><strong>\u00c9volution des temp\u00e9ratures moyennes en France entre avril et novembre<\/strong><\/em> &#8211; via infoclimat.fr<\/p>\n<p>Le m\u00eame raisonnement est donc utilisable pour l&#8217;hiver mais \u00e9galement pour le printemps et l&#8217;automne, ce qui explique pourquoi les saisons m\u00e9t\u00e9orologiques sont :<\/p>\n<ul>\n<li>Printemps : du 1er\u00a0mars au 31 mai ;<\/li>\n<li>\u00c9t\u00e9 : du 1er\u00a0juin au 31 ao\u00fbt\u00a0<\/li>\n<li>Automne : du 1er\u00a0septembre au 30 novembre<\/li>\n<li>Hiver : du 1er\u00a0d\u00e9cembre au 28 ou 29 f\u00e9vrier\u00a0<\/li>\n<\/ul>\n<p><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.meteo-paris.com\/uploads\/actu\/saisons-meteo-2025.png\" \/><\/p>\n<p><em><strong>Dates des saisons calendaires et m\u00e9t\u00e9orologiques 2025-2026 <\/strong><\/em>\u2013 M\u00e9t\u00e9o Express<\/p>\n<p>Compte tenu de cette inertie atmosph\u00e9rique mais \u00e9galement du fait que les saisons m\u00e9t\u00e9orologiques recouvrent exactement trois mois, ce qui facilite le calcul des donn\u00e9es climatiques, la plupart des pays ont adopt\u00e9 cette r\u00e8gle dans l&#8217;h\u00e9misph\u00e8re Nord et les dates de d\u00e9but et fin des saisons m\u00e9t\u00e9orologiques et astronomiques sont ainsi diff\u00e9rentes.<\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>Auteur : <a href=\"https:\/\/x.com\/BergenTristan\">Tristan Bergen<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>M\u00e9t\u00e9o\u00a0 Republi\u00e9 via Innoreader Read More Quelques explications sur les saisons Tout d&#8217;abord, il est important de rappeler pourquoi nous observons des saisons diff\u00e9rentes sur [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5245,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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