With the Yanshan mountains on the northwest and the North China Plain and ocean adjacent on the southeast, Beijing has a warm temperate semi-humid monsoon climate with four distinct seasons: dry and windy spring, hot and rainy summer, clear and crisp autumn, cold winter with little snow. Beijing has short springs (two months) and autumns (one and a half months) and long summers (three months) and winters (over five months).

Temperatures rise rapidly with large variance between day and night in spring when it rarely rains or snows but is frequented by dry weathers and strong winds accompanied by floating dust, flying sand or sandstorms. Scarce precipitation has earned Beijing a fame of "10 years 9 droughts". In the hot summer heat it rains often. Though July is the warmest month, most extreme high temperatures occur in June. About 70 percent of the yearly precipitation comes in summer, often in heavy downpours and causing mountain torrents and plain waterlogging. Autumn is the best season of the year: always clear and crisp, neither too cold or too hot, and endowed with adequate sunshine, pleasant weather and the best air quality. From December to February in the cold and dry winter, the monthly mean temperatures fall below 0 C; and the precipitation is only two percent of the year, often with record high zero precipitations for over a month.

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Pressure (hPa)	10242	10220	10174	10100	10057	10012	9997	10037	10105	10167	10214	10238

Pressure (hPa)
10242	10220	10174	10100	10057	10012	9997	10037	10105	10167	10214	10238
Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec

fig.1 monthly mean pressure

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Temp (oF)	25.3	30.7	42.4	57.5	67.8	75.9	79.1	76.8	68	55.5	40.2	29.3
Temp (oC)	-3.7	-.7	5.8	14.2	19.9	24.4	26.2	24.9	20	13.1	4.6	-1.5

Temperature (oC|oF)
-3.7 oC 25.3 oF	-.7 oC 30.7 oF	5.8 oC 42.4 oF	14.2 oC 57.5 oF	19.9 oC 67.8 oF	24.4 oC 75.9 oF	26.2 oC 79.1 oF	24.9 oC 76.8 oF	20 oC 68 oF	13.1 oC 55.5 oF	4.6 oC 40.2 oF	-1.5 oC 29.3 oF
Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec

fig.2 monthly mean temperature

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Min Temp (oF)	16.8	21.9	32.7	46.2	56.4	65.8	71.6	69.4	58.6	46.2	32	21.5
Min Temp (oC)	-8.4	-5.6	.4	7.9	13.6	18.8	22	20.8	14.8	7.9	0	-5.8
Max Temp (oF)	35.2	41	52.8	68.5	78.8	86.3	87.6	85.4	78.4	66.3	50.1	38.6
Max Temp (oC)	1.8	5	11.6	20.3	26	30.2	30.9	29.7	25.8	19.1	10.1	3.7

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Min Temp (oF)	-1	3.2	5	26.2	36.6	49.6	61.8	52.5	39.7	25.7	12.9	3.9
Min Temp (oC)	-18.3	-16	-15	-3.2	2.6	9.8	16.6	11.4	4.3	-3.5	-10.6	-15.6
Max Temp (oF)	55.2	67.6	79.5	91.4	98.2	102.5	107.4	96.9	93.9	84.7	71.6	67.1
Max Temp (oC)	12.9	19.8	26.4	33	36.8	39.2	41.9	36.1	34.4	29.3	22	19.5

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Hunidity (%)	44	44	46	46	53	61	75	77	68	61	57	49

Hunidity (%)
44	44	46	46	53	61	75	77	68	61	57	49
Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec

fig.3 monthly mean hunidity

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Hunidity (%)	0	0	0	0	2	0	3	13	8	0	0	3

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Precipitation (mm)	2.7	4.9	8.3	21.2	34.2	78.1	185.2	159.7	45.5	21.8	7.4	2.8
Days (Precipitation<0.1mm)	1.8	2.3	3.3	4.3	5.8	9.7	13.6	12	7.6	5	3.5	1.7
Days (Precipitation<10mm)	0	.1	.2	.7	1.1	2	5	3.9	1.6	.5	.1	0
Days (Precipitation<25mm)	0	0	0	.1	.2	.9	2.5	2.2	.4	.2	0	0
Days (Precipitation<50mm)	0	0	0	0	0	.2	1	.8	0	0	0	0

Precipitation (mm)
2.7	4.9	8.3	21.2	34.2	78.1	185.2	159.7	45.5	21.8	7.4	2.8
Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec

fig.4 monthly mean precipitation

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Precipitation (mm)	14.6	20.2	58	40.4	58.7	139.2	109.8	156.2	51.3	43	22.2	12.8

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Wind Speed (m/s)	2.6	2.8	3.1	3.2	2.9	2.5	2.1	1.8	2	2.1	2.4	2.6

Wind Speed (m/s)
2.6	2.8	3.1	3.2	2.9	2.5	2.1	1.8	2	2.1	2.4	2.6
Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec

fig.5 monthly mean wind speed

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Wind Speed (m/s)	20	18	20.7	21.7	21.3	15	21.7	12.3	12.7	17	16.7	19

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Duration (hour)	194.1	194.7	231.8	251.9	283.4	261.4	212.4	220.9	232.1	222.1	185.3	180.7

Duration (hour)
194.1	194.7	231.8	251.9	283.4	261.4	212.4	220.9	232.1	222.1	185.3	180.7
Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec

fig.5 monthly mean sunshine duration

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Percentage (%)	65	65	63	64	64	59	47	52	63	64	62	62

Remarks:
Weather forecast is provided by China Meteorological Administration.
Climate information is based on monthly averages for 30-year period of 1971-2000.
Precipitation includes both rain and snow.

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