Climatic Characteristics of Xiaohe Township in Songpan County

Songpan is located in the middle of Minshan Mountain range and belongs to the eastern edge of Qinghai-Tibet Plateau. The landform is obviously different from east to west, mainly mountainous; The terrain is obviously undulating and the relative height difference is relatively large. The lowest point of Shekou in Baiyang Township is1082m above sea level, and the highest point of Xuebaoding, the main peak of Minshan Mountain, is 5588m above sea level, with a relative height difference of 4506m.

Due to the complex terrain, Songpan has great differences in altitude and climate. But looking at the climate in various regions, the general characteristics are:

1, some of which are low temperature, extreme cold and lack of heat. Except Xiaohe Township, Shijiabao Township, Baiyang Township, Zhenping Township and Zhenjiang Township, where the climate is warmer, most areas of Songpan are located in alpine mountainous areas, with long winter and no summer, spring and autumn connected and four distinct seasons. The annual average temperature in the county is 5.7℃, and the annual extreme minimum temperature is -2 1. 1℃. From the end of June 1 1 to the end of February of the following year, the daily average temperature is below zero. The average temperature in March and April is above 6.5℃, and the average temperature in May and July is above 10℃.

2, long sunshine, rich in light energy resources Songpan is located in the plateau mountainous area, with low temperature, more sunny days, more sunshine hours and strong solar radiation. The annual sunshine hours in the county are 1, 827.5 hours, the sunshine percentage is 42%, and the annual total radiation is 1, 654,38+0.5.6 kcal/cm2, which exceeds most counties in Sichuan Basin.

The dry season and the rainy season are very different. The average annual precipitation in Chengguan area is 729.7mm, which varies greatly from year to year, and the most frequent year is twice that of the youngest. There is a clear distinction between dry season and rainy season, and the precipitation in rainy season accounts for more than 72% of the annual precipitation. The rainy season generally begins in late April or early May and ends in late September or early June 10. Winter is controlled by cold air from Siberia, with less precipitation, sunny weather, strong sunshine and dry, cold and windy air.

4. The annual temperature difference is large, the winter is long and cold, the spring and summer are short and the temperature is low, and the annual temperature difference is large. The average temperature of the hottest month in the county is 22.4℃, that of Leng Yue is-1 1.4℃, and that of the whole year is 33.8℃, so the planting activities are very seasonal. Because of the high altitude, strong solar radiation, strong airflow convection and fast heat absorption and dissipation, it has the characteristics of large daily temperature difference, which is between 10. 1℃ and 23. 1℃.