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我国四季分明,在农业生产中掌握季节变化,极为重要。四季的划分有三个标准:一是天文学上规定,以立春、立夏、立秋和立冬作为四季开始;二是常以阳历3、4、5月为春季,6、7、8月为夏季,9、10、11月为秋季,12、1、2月为冬季;三是气象学中规定,以五日为一候的平均气温多年稳定地达到10℃以上至21.9℃为春季,22℃以上为夏季,22℃逐渐下降到10℃为秋季,10℃以
It is extremely important that we have a clear seasons in our country and master the seasonal changes in agricultural production. There are three criteria for the division of the four seasons: one is astronomical provisions that start with the beginning of spring, the beginning of summer, the beginning of autumn and the beginning of winter as the four seasons; the second is often the spring with the solar calendar of March, April and May, the summer of June, July and August, 10, November for the autumn, 12, 1, February for the winter; Third, meteorology provides that the five-day average temperature over the years for many years and steadily reached above 10 ℃ to 21.9 ℃ for spring, 22 ℃ for summer , 22 ℃ gradually decreased to 10 ℃ for the fall, 10 ℃