Annual average temperature in major cities of China.

The annual average temperature in Haikou is 25.8 degrees Celsius, with the highest in1-June and1-kloc-0/February. Only in the hot summer vacation, it was surpassed by Zhengzhou and Changsha in July and by Chongqing, Wuhan, Nanchang and Changsha in August.

The city with the lowest annual average temperature is Harbin, with the lowest average temperature in 1, March, April,1,1and February.

Influencing factors of temperature:

1. Latitude (decisive factor): It affects solar height, day length, solar radiation and daily range, which is within annual range (the temperature days in low latitude and annual range are smaller than those in high latitude).

2. Topography (height, topography): shady slopes, sunny slopes, mountains, plains, valleys, and basins with different altitudes (for example, the topographic heat in valley basins is not easy to dissipate, and the tall terrain blocks the winter wind, and the daily amplitude in mountainous areas at the same latitude is worse than that in plains, and the annual amplitude is smaller).

3. Location of land and sea: The strength of ocean leads to the annual variation range of temperature.

4. Ocean current (warm current: warming and humidifying; Cold current: cooling and dehumidification).

5. Weather conditions (sunny in rainy days, and the temperature in the whole year is less than rainy days).

6. Underlying surface: ground reflectivity (high snow reflectivity and low temperature); The daily temperature and annual range of green land are less than that of bare land.

7. Human activities: heat island effect, greenhouse effect, etc.