Drifting weather in Anji general pass

Beijing area spans east longitude 1 15 degrees 25 minutes-east longitude 1 17 degrees 30 minutes, and north latitude 39 degrees 28 minutes-north latitude 4 1 0 degrees 05 minutes. Surrounded by mountains on three sides, the average elevation of the ridge is about 1000 meters, forming an arc-shaped natural barrier. The piedmont plain is close to the mountainous area, and the terrain is stepped from southeast to northwest. Beijing belongs to the continental climate of warm temperate zone, semi-humid and semi-arid monsoon. It has obvious characteristics of cold rain and snow in winter, strong wind and low humidity in spring, concentrated rain and heat in summer and cool light in autumn, and there are obvious regional differences. Because it is located at the intersection of cold and warm air, the annual precipitation changes greatly, and meteorological disasters such as drought, rainstorm, strong wind, hail and cold wave occur frequently.

Climatic characteristics of various seasons in Beijing

1, Spring (March-May): The temperature changes rapidly, and there are often strong winds to cool down.

The number of windy days accounts for 36% of the number of windy days in the whole year. The precipitation is 45-80mm, accounting for about 65,438+00% of the annual precipitation. Evapotranspiration accounts for 30-32% of annual evapotranspiration. Due to the rapid temperature rise, low humidity, strong evapotranspiration and dry soil, there are windy and dusty days now, and the temperature rises quickly after the wind. This is the characteristic of Beijing's continental climate.

2. Summer (June-August): hot and rainy is a remarkable feature. July average

The temperature in the plain is about 26 degrees, and it is 22-25 degrees in most mountainous areas. The precipitation is between 400-600 mm, accounting for about 75% of the annual precipitation. The distribution of precipitation is uneven. The areas around Zaoshulin, Badao River and Shuiman River in fangshan county, and Luo Ying, Haizi and Jiangjunguan in Pinggu Town are rainy areas. The seasonal precipitation is above 600-700 mm, and the seasonal precipitation is less than 400 mm in the mountainous area north of Kangzhuang and Zhangshanying in the northwest, with high precipitation intensity. Often a few rainstorms or one or two rainstorms are equivalent to a month's precipitation.

3. Autumn (September-165438+1October): it is suitable for cold and warm, sunny and warm with little rain.

Seasonal precipitation only accounts for 14% of the annual precipitation. The rapid cooling makes the duration of autumn shorter than that of spring In Fuan weather, a strong cold air went south in late autumn and entered winter.

4. Winter (65438+February-February): cold and dry, windy and snowy season is long, which is the characteristic of this season. The monthly average temperature is below zero, and the precipitation is only about 10 mm, accounting for 2% of the annual precipitation. Strong winds and cold waves occur every year, but the intensity and time are different.