Geographical environment of the eastern district

The eastern region belongs to the three-dimensional climate with the sub-tropical as the baseband, and the vertical difference is significant. Winter is controlled by tropical continental air mass, and the weather is sunny and dry. Affected by tropical monsoon, there is abundant rainfall in summer. June ~ 10 is rainy season, and June ~ 1 10 is dry season. More than 90% precipitation is concentrated in the rainy season. The average annual temperature in the region is 20.9℃, and the average temperature and total heat in the whole city are on the high side. The hottest month generally appears in May-June, and the most Leng Yue appears in 65438+February or 65438+ 10. The daily temperature difference in June, 5438+ 10 and February is the largest, with a monthly average of about 13℃, and the maximum daily temperature difference can reach more than 20℃. The annual sunshine hours are about 2,640 hours, the annual average sunny days are about 240 days, rainy days are about 60 days, cloudy days are about 65 days, and the annual average total solar radiation is about 632 100 Jow/cm2, forming a unique high temperature area in the same latitude area.

The climate in the east area is dry, with annual rainfall of about 800 mm, annual evaporation of 2,400 mm and annual average relative humidity of 59%. The annual average air pressure is 878.00 mbar, with the lowest in June and the highest in165438+1October. The difference between height and height is about 9 millibars. It is southeast wind in Xia Dong in both seasons. The annual maximum wind speed is 18.30m/s, and the annual average wind speed is 2m/s in summer and 1. 10m/s in winter. The annual average number of windy days is 12.20 days, and the annual quiet wind frequency is 46%. The first ten days of February-May is a windy season, with the smallest wind speed, the fewest windy days and the highest quiet wind frequency in autumn. The frost-free period lasts for more than 300 days, and there is basically no winter below the altitude of 1 400 meters, and the summer lasts for about half a year. The average frost day in China is 14.20 days, the first frost period is in the middle of 65438+February, the last frost period is generally in February, and the average frost-free period is 287.60 ~ 308.438+00 days.