Climatic and Geomorphological Features of Kunming

Climate characteristics: Kunming is located in the subtropical zone of north latitude. However, most areas in China have typical temperate climate characteristics and are known as "Spring City" at home and abroad. The main features of the climate in Kunming are as follows. 1. Spring is warm, dry and rainy, with strong wind and strong evaporation, and the daily temperature changes greatly. In spring, the airflow comes from the tropical continent, with plenty of sunshine, and the average monthly temperature is mostly below 20℃. But the temperature difference between day and night is large, which has the characteristics of "spring in the morning, summer in the afternoon, autumn in the evening and winter in the middle of the night". There is little precipitation in spring, low air humidity, large evaporation and rapid temperature rise, which makes agricultural production vulnerable to drought, which is not conducive to the growth and sowing of crops in spring. 2. There is no intense heat in summer, the rainfall is concentrated in summer, the airflow comes from the tropical ocean, it is rainy and cloudy, the water is sufficient, the soil is moist, and the solar radiation absorbed by the ground is reduced, so the radiation heat is used for water evaporation. Therefore, in midsummer, except for areas below 1600 meters above sea level, the average temperature can reach the summer standard of 22℃ in about two months, and most other areas belong to the spring climate below 2 1℃, so there is no hot summer period. Summer rainfall is concentrated, with heavy rain and heavy rain, and precipitation accounting for more than 60% of the whole year, which is prone to floods. 3. The air is crisp in autumn, the weather is crisp, the rain is reduced, and the temperature drops rapidly in autumn during the frost period, and the weather is dry. The temperature in most areas is about 2℃ lower than that in spring. Precipitation is reduced by more than half compared with summer, but it is more than winter and spring, and autumn drought is rare. Generally, the rainy season ends in the first half of June 65438+1October, and the first frost period begins in the first half of June165438+1October. There is no severe cold in winter, and there is plenty of sunshine. It is sunny and rainy. In winter, the average sunny day is about 20 days, sunshine is about 230 hours, and rainy day is about 4 days. The precipitation in the whole season only accounts for 3% ~ 5% of the whole year. Except for the valley areas below 1500m, the winter lasts for more than two months in most areas of the city (the five-day average temperature is lower than 10℃), and sometimes there will be cold weather, frost or snowfall, which may cause crops to suffer in early spring. 5. The dry season and the rainy season are completely different. In terms of time distribution, the annual precipitation is obviously divided into dry season and rainy season. May ~ 10 is the rainy season, and the precipitation accounts for about 85% of the whole year. The dry season is 1 1 to April of the following year, and the precipitation only accounts for about 15% of the whole year. In April and May, the precipitation 10 and 1 1 changed greatly. The precipitation in May is two or three times more than that in April, and 1 1 monthly precipitation is more than that in June 1 times.