A day when the maximum temperature is below 0°C. Also called an ice day. On a midwinter day, ice or frost does not melt all day. The average values for major cities (1981-2010) are 75 days in Wakkanai, 45 days in Sapporo, 2 days in Sendai, 1 day in Niigata, and 0 days in Tokyo, Nagoya, Kyoto, Osaka, Fukuoka, Kagoshima, and Naha. There are many in Hokkaido, and many inland in Honshu, with 20 days in Karuizawa, 7 days in Nagano, and 10 days in Takayama. Tokyo has only had four midwinter days since observation began in 1876, and none have been observed since February 12, 1967. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
日最高気温が 0℃未満の日。氷日ともいう。真冬日には氷や霜が一日中溶けない。おもな都市の平年値(1981~2010)は,稚内 75日,札幌 45日,仙台 2日,新潟 1日,その他東京,名古屋,京都,大阪,福岡,鹿児島,那覇では 0日である。北海道で多く,本州では内陸で多く軽井沢 20日,長野 7日,高山 10日である。東京の真冬日は,1876年の観測開始から 4回のみで,1967年2月12日以降は観測されていない。
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