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\u8868\uff1a1991-2020\u5e74\u56db\u6708\u4efd\u5929\u6587\u53f0\u6700\u4f4e\u6c23\u6eab\u6392\u540d\uff08\u8cc7\u6599\u4f86\u6e90\uff1a\u9999\u6e2f\u5929\u6587\u53f0\uff09<\/p>\n
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\u5716\uff1a2014\u5e743\u670830\u65e5\u665a\u4e0a\u9999\u6e2f\u53d7\u66b4\u96e8\u53ca\u51b0\u96f9\u5f71\u97ff\uff0c\u5929\u6587\u53f0\u767c\u51fa\u9ed1\u8272\u66b4\u96e8\u8b66\u544a\uff08\u8cc7\u6599\u4f86\u6e90\uff1a\u9999\u6e2f\u5929\u6587\u53f0\uff09<\/p>\n
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![](\"https:\/\/i0.wp.com\/www.weather.org.hk\/news\/wp-content\/uploads\/2023\/04\/d2f88c6c7f5ed128c75cac77e0be2dec.png?ssl=1\")
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\u5ef6\u4f38\u95b1\u8b80\uff1a<\/p>\n
近日天氣相當溫暖，新界氣溫更接近30度。不過一道冷鋒將於星期五橫過香港，天氣再次轉涼，星期六早上新界氣溫可能降至12度或以下。 古時農民以「立春」作為春天的開始，而在二十四節氣中，「立春」出現在2月3-4日。不過即使到了四月，北方的冷空氣依然活躍。當冷空氣南下路徑偏南時，便會為華南包括香港帶來降溫，稱為「倒春寒」。一般來說，「倒春寒」出現在三至五月，中國不同省份有不同標準，例如雲南省三月連續四日平均氣溫低於正常超過6度時，就稱為「倒春寒」。香港沒有「倒春寒」的標準，但翻查天文台紀錄，最近三十年四月份最低氣溫排名如下： 表：1991-2020年四月份天文台最低氣溫排名（資料來源：香港天文台） 春天日間天氣溫暖，因此冷空氣到達後，高低氣溫可以相差10度以上，容易影響健康。此外，當溫暖潮濕氣團與寒冷乾燥氣團相遇時，容易形成「強對流天氣」，包括大雨，雷暴甚至冰雹。 圖：2014年3月30日晚上香港受暴雨及冰雹影響，天文台發出黑色暴雨警告（資料來源：香港天文台） 「倒春寒」對農作物生長及市民健康均有影響。天氣轉冷令農作物生長停止，大雨、冰雹更會破壞農作物。而每當氣溫下降，長者及長期病患者的熱平衡能力較差，皮膚及神經系統受寒冷天氣刺激後引致血管收縮，血壓上升，腦部及心臟無法負荷，出現高血壓及中風等問題，甚至引致死亡。天氣突然轉冷亦會令細菌及病毒乘虛而入，呼吸系統疾病例如流感及肺炎個案亦會增加。因此市民應留意天文台的天氣預報，並利用實時天氣雷達監測天氣變化（例如大雨及雷暴），外出時帶備雨具及注意穿衣，以免著涼。 圖：歐洲 ECMWF 預報星期六早上香港及鄰近地區氣溫（來源：meteologix） 延伸閱讀： 北極平流層突然增溫, 留意冷空氣發展 西班牙及泰國可能出現極端低溫<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[43],"tags":[],"class_list":["post-2027","post","type-post","status-publish","format-standard","hentry","category-43"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/2027","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/comments?post=2027"}],"version-history":[{"count":13,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/2027\/revisions"}],"predecessor-version":[{"id":4629,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/2027\/revisions\/4629"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=2027"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=2027"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=2027"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}