In winter, it is one of the four seasonses, and points out season during the coldest period of one year. Like twenty-four seasons or the lunar calendar, the period when a solar altitude is the lowest and when night is long may be pointed out by all the year round. It is common around January-February after winter solstice to be low-temperature in the Northern Hemisphere, and will hit in the Southern Hemisphere around July-August after the summer solstice. At the Meteorological Agency of Japan, the Japanese lowest temperature on the first calls a winter day an ice day for a day 0 ℃ or less, and the Japanese maximum temperature is calling a day 0 ℃ or less. Except warm Chugoku-Shikoku district and Kyushu, since such a day will occur from December at the next year March time every year of order focusing on January however, it may produce even in November and April depending on a year or the area, the hit of this time goes into the range of winter.
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