A midsummer day is a day when the maximum temperature is over 30°C. In Tokyo, there are an average of 46 midsummer days per year (average from 1971 to 2000), and this number has tended to increase in recent years. A midwinter day is a day when the maximum temperature is below 0°C. There are similar words, summer day and winter day, but a summer day is a day when the maximum temperature is over 25°C, and a winter day is a day when the minimum temperature is below 0°C. A tropical night is a night that is as hot as in the tropics and difficult to sleep, and since weather statistics often show that the minimum temperature is observed before dawn, it is considered a day when the minimum temperature is over 25°C. A scorching hot day is a day when the maximum temperature is over 35°C. [Number of midsummer days in Tokyo by year] (1971-1980) 41, 40, 52, 39, 62, 31, 41, 63, 53, 21 (1981-1990) 41, 24, 35, 51, 54, 33, 50, 21, 47, 60 (1991-2000) 45, 46, 19, 66, 50, 46, 58, 48, 63, 67 (2001-2007) 52, 59, 38, 70, 57, 38, 54 (Yo Narumura, Director of Wakayama Meteorological Observatory / 2008) Source : "Chiezo" published by Asahi Shimbun Publications Co., Ltd. About Chiezo |
真夏日は、最高気温が30℃以上の日で、東京の1年間の真夏日は、平年(1971〜2000の平均)は46日で、近年増える傾向にある。真冬日は最高気温が0℃未満の日。似た言葉に夏日(summer day)と冬日(winter day)があるが、夏日は最高気温が25℃以上の日で冬日は最低気温が0℃未満の日。熱帯夜は熱帯のように暑く寝苦しい夜のことで、気象統計は最低気温が夜明け前に観測されることが多いことから、最低気温が25℃以上の日としている。最高気温が35℃以上の日を猛暑日。 【年ごとの東京の真夏日日数】 (1971〜1980) 41、40、52、39、62、31、41、63、53、21 (1981〜1990) 41、24、35、51、54、33、50、21、47、60 (1991〜2000) 45、46、19、66、50、46、58、48、63、67 (2001〜2007) 52、59、38、70、57、38、54
(饒村曜 和歌山気象台長 / 2008年) 出典 (株)朝日新聞出版発行「知恵蔵」知恵蔵について 情報 |
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