According to Beijing meteorological data, the average urban wind speed in recent
years was 2.5 m/s with a maximum of 13.9 m/s. The average annual precipitation
of the city is generally between 550 and 650 mm, with large variation through the
year. The specific statistics can be seen in Fig. 5.50. Precipitation distribution in the
region is uneven throughout the year. The precipitation of the flood season (June–
September) accounts for more than 80% of that of the whole year, as detailed in
Fig. 5.51.
In addition to the extremely uneven distribution by time, the spatial distribution
of precipitation in Beijing is also non-uniform. According to the Beijing Water
Resources Bulletin (2015), precipitation in the northwestern part of Beijing is small,
and that in the east and southeast parts is large.
Precipitation (mm)
Year 1949
Year 1952
Year 1955
Year 1958
Year 1961
Year 1964
Year 1967
Year 1970
Year 1973
Year 1976
Year 1979
Year 1982
Year 1985
Year 1988
Year 1991
Year 1994
Year 1997
Year 2000
Year 2003
Year 2006
Year 2010
Year 2013
Fig. 5.50 Annual rainfall statistics in Beijing region
0
50
100
150
200
250
300
350
Month
Precipitation (mm)
January
February
March
April
May
June
July
August
September October November
December
Fig. 5.51 Distribution of average precipitation in Beijing during 2016
5.5 North China
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