Why is it so hot in Jinan?

The annual average total solar radiation in Jinan is120.9 ~126.7 kcal/cm2, which is rich in light resources and located in the high-value area of solar radiation distribution in Shandong Province. Solar radiation varies greatly in a year, with the highest in spring and summer, the second in autumn and the least in winter.

The climate of Jinan is located in the mid-latitude zone and belongs to the continental monsoon climate of warm temperate zone. Its main climatic characteristics are: the monsoon is obvious and the four seasons are distinct; In winter, Leng Xia is hot and the rainfall is concentrated.

The monsoon is obvious and the four seasons are distinct. In winter, Mongolian high is formed in the northern part of Asian continent, and Jinan is controlled by denatured polar continental air mass and often attacked by cold air in the north. The weather is cold and sunny, with little rain and snow and northerly winds. In summer, influenced by tropical and subtropical ocean air masses, warm and humid air currents prevail in the ocean, with hot weather, abundant rainfall, abundant sunshine and southerly winds. Spring and autumn are the transitional seasons from winter to summer and from summer to winter, and the wind direction is changeable. During the year, in different seasons, the whole city is under the control of different atmospheric circulation, which constitutes a distinct climate change in spring, summer, autumn and winter. The winter in Jinan lasts for 4 to 5 months, generally from the first ten days of 1 1 to the last ten days of March. Summer is 105 ~ 120 days, generally from late May to early September; Spring and autumn are the shortest, less than two months.

In winter, Leng Xia is hot and the rainfall is concentrated. In winter, Jinan is controlled by Mongolian cold high pressure, and the cold northerly wind blows. Generally, there is a cold air intrusion every 6 ~ 8 days, which makes the temperature drop continuously. In winter, the average temperature in Leng Yue is below 0℃, and the average extreme minimum temperature is below -20℃ (Pingyin county-18.9℃, Changqing county-19. 1℃, the northern suburb of Jinan-19.7℃, and the eastern suburb of Jinan-22. The maximum frozen soil depth is about 45cm, and the maximum snow depth is about 20cm. The winter precipitation is 20 ~ 25mm, accounting for only 3.0 ~ 3.7% of the total annual precipitation. There is little rain and snow throughout the winter, and the north wind is frequent, dry and cold. Summer is hot, the average seasonal temperature is around 26℃, the extreme maximum temperature exceeds 40℃, and the high temperature with daily maximum temperature ≥40℃ occurs in summer every day. Summer is not only hot, but also rainy and hot in the same season. The average summer precipitation in counties and districts of the city is over 400 mm, and 60% of the annual precipitation is concentrated in summer. The average precipitation days in July are about 15 days, and the rainstorm days with daily precipitation ≥50 mm are concentrated in July and August, accounting for 70% of the rainstorm days in the whole year.