The weather in Beijing in April

Beijing's climate is a typical warm temperate semi-humid continental monsoon climate, with hot and rainy summer, cold and dry winter and short spring and autumn. Annual average temperature 10~ 12 degrees Celsius. 1October 65438+-7~-4 degrees Celsius, July 25~26 degrees Celsius. The frost-free period of the whole year is 180~200 days, which is shorter in the western mountainous area. The annual average rainfall is more than 600 mm, which is one of the most rainy areas in North China. The windward slope in front of the mountain can reach more than 700 mm, and the seasonal distribution of precipitation is very uneven. 80% of the annual precipitation is concentrated in June, July and August in summer, and there are often heavy rains in July and August.

Sandstorms are sporadic, so it is difficult to make long-term predictions.

Weather reference of Beijing in spring of 2008:

In the spring of 2008 (from March 2008 to May 2008), the temperature in most parts of Beijing was high, the precipitation was unusually high, and the dusty weather was less.

1, high temperature

The average spring temperature in the plain area of this city is 14.6℃, which is higher than normal, and close to the average in recent ten years (14.3℃) and the average in spring of 2007 (14. 1℃). The highest average temperature appears in the urban meteorological observatory, Haidian and Shijingshan. The average temperature of each station in the city is 0.3 ~ 2℃ higher than normal.

In spring, the temperature changes greatly every month. In early March, the average temperature in the plain was 7.5℃, which was 4.3℃ higher than normal (3.2℃), setting a new high in the same period since 197 1. In late April, cold air activities in our city were more frequent and the temperature dropped rapidly. The average temperature in mid-May was 2.6℃ lower than normal, which was the lowest in spring of 2008. The weather was fine in late May, and the temperature rose rapidly, 2.3℃ higher than normal (2 1.6℃).

2. The precipitation is unusually high.

The average precipitation in spring in the plain area of this city is 1 18.2 mm, which is 90% more than normal (62.2 mm) and 60% more than the average (73.4 mm) in recent ten years. Mentougou in the west has the most precipitation, and the seasonal precipitation is 159.3mm, which is more than normal (65.6mm) 1.4 times. Shangdianzi in the northeast has the least precipitation, with the seasonal precipitation of 85.6 mm, which is less than 20% more than normal (74.2 mm). The precipitation is mainly concentrated in four precipitation processes, namely March 28th to March 29th, April 20th to April 2nd1,May 3rd and May1.

3. There are many days of precipitation, with early initial thunder and early final frost.

The number of precipitation days (daily rainfall ≥ 0. 1mm) in the meteorological station in spring is 20 days, which is more than normal (13.4 days). The first thundering day at Beijing Observatory in the spring of 2008 was April 1, which was obviously earlier than normal (April 23rd). The last frost day (ground temperature ≤0℃) at Beijing Observatory in spring of 2008 occurred on March 3rd1,which was 10 days earlier than normal (April 10).

4. The wind is small, and the dust is mainly floating dust, which is less than normal.

In the spring of 2008, there were six days of dusty weather in Beijing, which was less than normal (9.7 days), and all the manifestations were foreign floating dust. Among them, March is 1 day, which occurs on March18; There are five days in May, which are more than normal (2.7 days). They appear on May 20th, May 2nd1day, May 27th, May 28th and May 29th respectively, all in late May, which is the latest sandstorm in recent years. In addition, on March 1 day, dusty weather also appeared in parts of northern Beijing.

In the spring of 2008, the number of windy days in the observatory was only 2 days, which was obviously less than normal (8.7 days). Appeared on April 25th and May 29th respectively.