Changshu climate

Name: Changshu
Address: CN

Changshu is warmest in July, with average highs of 32 °C, and coldest in January, when nights average -0.2 °C. June is the wettest month (250 mm) and December the driest (40 mm). Figures are 1991–2020 climate normals.

Across a full year Changshu averages 1,283 mm of rain, 138 days above 25 °C and 41 days below freezing.

China · population 1,677,050 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month July 32 °C
Coldest month January -0.2 °C
Driest month December 40 mm
Wettest month June 250 mm
Least cloud December 50 % cloud
Hottest on record August 40 °C
Coldest on record December -11 °C

What to expectChangshu through the year

Changshu has a clear annual cycle: average daily highs run from 8.3 °C in January to 32 °C in July, a swing of 24 °C in mean temperature across the year.

Counted across a normal year, 138 days a year reach 25 °C, 61 of them reach 30 °C, 41 nights drop below freezing. The warmest reading in the 1991–2020 record is 40 °C, in August.

Rain is strongly seasonal. June averages 250 mm against 40 mm in December — 6.2 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	8.3 °C	61 mm	58 %
February	10.5 °C	57 mm	62 %
March	14.7 °C	85 mm	66 %
April	20.5 °C	96 mm	66 %
May	25.5 °C	120 mm	67 %
June	28.2 °C	250 mm	77 %
July	31.7 °C	196 mm	70 %
August	31.2 °C	175 mm	62 %
September	27.3 °C	96 mm	57 %
October	22.6 °C	52 mm	52 %
November	17.1 °C	56 mm	52 %
December	10.6 °C	40 mm	50 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	8.3 °C	-0.2 °C	3.9 °C	21.5 °C	-9.4 °C	0	0	18
February	10.5 °C	1.5 °C	5.8 °C	25.9 °C	-7.2 °C	0	0	10
March	14.7 °C	5.6 °C	9.8 °C	27.8 °C	-5.0 °C	1	0	2
April	20.5 °C	11.1 °C	15.4 °C	32.6 °C	-1.1 °C	5	0	0
May	25.5 °C	16.4 °C	20.6 °C	37.8 °C	6.3 °C	17	3	0
June	28.2 °C	20.8 °C	24.2 °C	37.0 °C	13.8 °C	25	9	0
July	31.7 °C	25.1 °C	28.0 °C	39.7 °C	17.4 °C	30	22	0
August	31.2 °C	24.8 °C	27.6 °C	40.3 °C	17.9 °C	30	21	0
September	27.3 °C	20.3 °C	23.4 °C	36.3 °C	10.1 °C	24	5	0
October	22.6 °C	14.4 °C	18.2 °C	31.7 °C	4.5 °C	7	0	0
November	17.1 °C	8.6 °C	12.5 °C	29.7 °C	-6.0 °C	1	0	1
December	10.6 °C	1.9 °C	6.1 °C	21.2 °C	-10.6 °C	0	0	11

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	61 mm	8	10 h/day	58 %	74 %	16 km/h
February	57 mm	8	11 h/day	62 %	74 %	17 km/h
March	85 mm	10	12 h/day	66 %	73 %	18 km/h
April	96 mm	10	13 h/day	66 %	73 %	18 km/h
May	120 mm	10	14 h/day	67 %	74 %	17 km/h
June	250 mm	14	14 h/day	77 %	80 %	16 km/h
July	196 mm	15	14 h/day	70 %	81 %	16 km/h
August	175 mm	15	13 h/day	62 %	82 %	16 km/h
September	96 mm	9	12 h/day	57 %	80 %	16 km/h
October	52 mm	6	11 h/day	52 %	75 %	15 km/h
November	56 mm	7	11 h/day	52 %	74 %	16 km/h
December	40 mm	6	10 h/day	50 %	72 %	16 km/h

How Changshu compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Changshu	32 °C	-0.2 °C	1,283 mm	138
Kunshan · China	32 °C	0.4 °C	1,299 mm	136
Suzhou · China	32 °C	0.8 °C	1,418 mm	135
Wuxi · China	31 °C	0.05 °C	1,354 mm	137
Nantong · China	31 °C	0.1 °C	1,254 mm	127
Jiangyin · China	31 °C	-0.6 °C	1,254 mm	137
Qingpu · China	32 °C	0.6 °C	1,341 mm	136

Planning a trip? See the best time to visit Changshu.

QuestionsCommon questions about Changshu’s climate

When is the best time to visit Changshu?

That depends on what you want, so the honest answer is a comparison rather than a single month. May, September, October sit closest to 20 °C on average, July is the warmest month and December the driest. The month-by-month table above has the full picture.

How hot does Changshu get?

In July, the warmest month, daily highs average 32 °C. About 61 days a year pass 30 °C. The highest value in the 1991–2020 record is 40 °C.

How cold does it get in winter?

Nights average -0.2 °C in January, the coldest month. A normal year has 41 nights below freezing.

Which month is wettest in Changshu?

June, averaging 250 mm over 14 days with rain. The driest month is December with 40 mm. The year as a whole averages 1,283 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Changshu rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 31.646°, 120.742° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.