Why does the daily temperature range decrease with the increase of latitude?

The diurnal variation of solar height in high latitudes is small.

The daily temperature range decreases with the increase of latitude. This is because the change of the sun's height in a day decreases with the increase of latitude. The daily temperature difference in tropical areas is about 65438 02℃. The daily range of temperate zone is 8.0 ~ 9.0℃; The daily temperature difference of polar circle is 3.0 ~ 4.0℃.

Generally, the daily range in summer is greater than that in winter, but in the middle and high latitudes, the maximum daily range in a year appears in spring. Because in summer, although the height angle of the sun is large, the sunshine time is long and the temperature is high during the day, the daily temperature difference in summer is not as large as that in spring because of the short day, short cooling time and high temperature at night in the middle and high latitudes.

Extended data

Factors affecting the temperature annual range

At latitude (1), the temperature annual range increases with the increase of latitude. This is because with the increase of latitude, the annual variation of solar radiation energy increases (the height of the sun at noon and the length of day and night change greatly in a year).

For example, the annual temperature variation of Xisha Islands (16 50' N) in China is only 6℃, that of Shanghai (3 1' N) is 25℃, and that of Hailar (49 13'N' N) is 46℃. The annual temperature in low latitudes is very low, and the annual temperature in high latitudes can reach 40 ~ 50℃.

(2) The thermal properties of land and sea are different. Compared with the land and ocean at the same latitude, the difference of heat income between China mainland in winter and summer is greater than that of the ocean, so the closer to the ocean, the greater the influence of the ocean, the smaller the temperature annual range, and the farther away from the ocean, the smaller the influence of the ocean and the greater the temperature annual range. In general, the temperature difference between temperate oceans and the mainland last year was 1 1℃, and it could reach 20 ~ 60℃.

(3) Topography: Generally, highlands are smaller than depressions and valleys. The higher the altitude, the smaller the annual range.

(4) Weather, areas with more clouds and rain are smaller than areas with less clouds and rain.

Baidu Encyclopedia-Daily Temperature Range