Rainfall data in Beijing over the years

The historical rainfall data of Beijing are 20 1 1 annual rainfall of 72 1. 1 mm, 20 10 annual rainfall of 5338 mm, 2009 rainfall of 480.6 mm, 2008 rainfall of 600 mm and 2007 rainfall of 48338 mm respectively. The rainfall in 2005 was 465,438+007mm, in 2004 it was 483.5mm, in 2003 it was 444.5mm, in 2002 it was 370.4mm, and in 2006 it was 5,438+0,389mm.

Beijing has a typical semi-humid continental climate with less rainfall. The average annual precipitation in Beijing is about 600 mm to 700 mm, which is less than that in other regions or coastal cities.

Precipitation in Beijing is mainly concentrated in summer and autumn. Affected by the southeast monsoon and weak warm and humid airflow in summer, the precipitation is relatively large, accounting for most of the total precipitation in the whole year, and it is relatively dry in winter.

Influencing factors of rainy weather

1, Humidity: Humidity is an index to measure the water vapor content in the air, and high humidity will increase the possibility of condensation and precipitation of water vapor in the air.

2. Temperature: The change of temperature directly affects the content of water vapor in the air. Rising temperature can make water vapor condense into clouds more easily and form precipitation.

3. Airflow: The formation and movement of different airflows will also affect precipitation. For example, the intersection of warm and humid air and cold air will lead to frontal weather, which may lead to large-scale precipitation.

4. Topography: Topography has a great influence on rainfall distribution. For mountainous areas or highlands, when wet air rises, it will cool down due to vertical rise, resulting in precipitation, thus forming a rain shadow effect.