Suzhou, China climate

Cfa Humid subtropical

Suzhou has a strongly seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 90°F, while the coldest is January averaging around 32°F at night. Precipitation totals about 41 inches a year and is strongly seasonal — July alone averages 7.1 inches while December barely receives 1.47 inches.

☀️ Summers

Hot

Highs near 90°F in July.

About 49 days a year above 90 °F

❄️ Winters

Cold

Lows near 32°F in January.

About 36 freezing nights a year

🌧️ Rain

Wet

About 41 in of rain a year.

Wettest in July

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+1.2 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Suzhou climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	45	50	59	71	81	85	90	89	83	73	62	50
Avg temp (°F)	38	43	51	62	73	78	84	83	75	65	53	42
Avg low (°F)	32	36	43	54	64	72	78	76	68	57	45	35
Precipitation (in)	1.9	2.0	3.2	3.1	3.6	6.4	7.1	5.5	2.6	2.2	2.1	1.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	45	50	59	71	81	85
Avg temp (°F)	38	43	51	62	73	78
Avg low (°F)	32	36	43	54	64	72
Precipitation (in)	1.9	2.0	3.2	3.1	3.6	6.4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	90	89	83	73	62	50
Avg temp (°F)	84	83	75	65	53	42
Avg low (°F)	78	76	68	57	45	35
Precipitation (in)	7.1	5.5	2.6	2.2	2.1	1.5

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	9	9	10	9	10	10	11	12	8	8	8	7
Days with high ≥ 90°F (days)	—	—	—	0.3	3	8	17	17	4	0.4	—	—
Days with low ≤ 32°F (days)	16	8	1	—	—	—	—	—	—	—	1.0	10

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	9	9	10	9	10	10
Days with high ≥ 90°F (days)	—	—	—	0.3	3	8
Days with low ≤ 32°F (days)	16	8	1	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	11	12	8	8	8	7
Days with high ≥ 90°F (days)	17	17	4	0.4	—	—
Days with low ≤ 32°F (days)	—	—	—	—	1.0	10

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	61	66	69	69	71	76	70	65	63	58	54	53
Clear days (≤ 30% cloud)	8	5	5	4	4	3	4	5	7	9	10	11
Partly cloudy days (30–70%)	8	8	8	9	8	7	8	11	8	9	8	8
Cloudy days (≥ 70%)	15	16	18	17	19	20	18	16	15	14	12	13
Relative humidity (%)	75	74	74	71	70	73	80	79	75	71	73	74
Wind speed (mph)	5.6	6.0	6.3	6.2	6.0	5.5	5.3	5.1	5.3	5.2	5.5	5.6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	61	66	69	69	71	76
Clear days (≤ 30% cloud)	8	5	5	4	4	3
Partly cloudy days (30–70%)	8	8	8	9	8	7
Cloudy days (≥ 70%)	15	16	18	17	19	20
Relative humidity (%)	75	74	74	71	70	73
Wind speed (mph)	5.6	6.0	6.3	6.2	6.0	5.5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	70	65	63	58	54	53
Clear days (≤ 30% cloud)	4	5	7	9	10	11
Partly cloudy days (30–70%)	8	11	8	9	8	8
Cloudy days (≥ 70%)	18	16	15	14	12	13
Relative humidity (%)	80	79	75	71	73	74
Wind speed (mph)	5.3	5.1	5.3	5.2	5.5	5.6

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 25 years of daily observations at Hefei, a weather station, about 198 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →