The climate in Hangzhou in autumn and winter

As summer turns to autumn in September, the light and temperature drop simultaneously. At the same time, affected by typhoons and cold air, the autumn rains came, which alleviated the late drought. From October to November, cool autumn weather prevails. There is sufficient sunlight, large diurnal temperature range, and light and temperature conditions are better than those in spring. In winter, light, heat, and water are at their lowest levels of the year.

Hangzhou City has a vast area of ​​low mountains and hills, along with river plains and basins and valleys surrounded by mountains and rivers, so it has obvious topographic and climate characteristics. As can be seen from Table 1, in the Ningshao Plain area in the east, the monthly average temperature in winter (represented by January) is 0.9-1.3℃ higher than that in the low hilly valleys in the west. However, the temperature of ≥10℃ warms up at the beginning of Lin'an and the eastern plain. The area is the same. On the first day when ≥15℃ warms up, Lin'an is 3 days earlier than Ningbo; from the first day when ≥10℃ warms up to ≥15℃, Lin'an takes 22 days, while it takes 25-26 days in Ningbo in the east, and the spring temperature returns earlier than in the Ningshao Plain. Table 2 lists the average temperature recovery in the two months before and after the first half of the year in Ningbo, Xiaoshan and other places. It can be seen from the table that the average temperature recovery value from February to April in the basin valley is greater than that in the plain areas.

The diurnal temperature range in the mountain basins and valleys is significantly greater than that in the plains. The annual average daily temperature range in Changhua is 11.0℃, in Jiande it is 10.1℃, while in the plain area in the northeast of Hangzhou it is only 7 ．9-8.1℃, which is 2-3℃ lower than that in the mountain basins and valleys. This is another climate characteristic of Hangzhou.