Changzhou climate — normals and trends

Q: What is the climate of Changzhou?

Changzhou has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.2 °C and it receives 1,289 mm of precipitation per year.

Q: What is the hottest day ever recorded in Changzhou?

The hottest day measured in Changzhou between 1940 and 2025 was 5 August 1946, reaching 40.5 °C.

Q: What is the coldest day in Changzhou?

The coldest day measured in Changzhou between 1940 and 2025 was 17 January 1945, at -15.2 °C.

Q: Does it snow in Changzhou?

Yes. Changzhou gets on average 11.2 cm of snow per year and has around 38 frost days.

Q: Has the climate of Changzhou warmed?

Yes: Changzhou warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Changzhou?

The wettest day measured in Changzhou between 1940 and 2025 was 4 August 1960, with 176 mm of rain in 24 hours.

Q: What was the windiest day in Changzhou?

The windiest day measured in Changzhou between 1940 and 2025 was 8 August 2012, with winds reaching 48.5 km/h.

Q: What is the warmest month in Changzhou?

The warmest month in Changzhou is July (28.6 °C on average); the coldest is January (3.3 °C).

Q: How much does it rain in Changzhou?

Changzhou receives on average 1,289 mm of precipitation per year, spread over about 120 rainy days.

Q: Is it sunny in Changzhou?

Changzhou gets on average 7.8 hours of sunshine per day, roughly 2,847 hours per year over 1940-2025.

Changzhou (China) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.2 °C and it receives 1,289 mm of precipitation per year.

These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.

The warmest month is July (28.6 °C on average) and the coldest is January (3.3 °C). Rainfall peaks in June.

Changzhou averages 38 frost days, 65 hot days (≥ 30 °C) and 120 rainy days per year.

Changzhou has warmed by +1.5 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.

The number of frost days there went from about 48 to 28 per year over the period.

The hottest day of the period reached 40.5 °C (on 5 August 1946) and the coldest -15.2 °C (on 17 January 1945).

Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.

Climate normals · ERA5

ChangzhouJiangsu

coords: 31.77°, 119.95°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJulyColdest monthJanuaryWettest monthJuneDriest monthDecember

Mean daily temperature

16.2°C

Average daily high

20.2°C

Average daily low

12.7°C

Annual rainfall

1,289mm

Sunshine / day

7.8h

Mean relative humidity

76%

Average peak wind

16.2km/h

Seasonal range

25.3°C

Frost days (< 0 °C)

38 d/yr

Hot days (≥ 30 °C)

65 d/yr

Rainy days (≥ 1 mm)

120 d/yr

Annual snowfall

11.2 cm

Average feels-like high

20.4 °C

Average feels-like low

12.2 °C

Average peak gust

32.5 km/h

Tropical nights (≥ 20 °C)

105 d/yr

Solar radiation

14.5 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.5 °C

since 1940

+0.2 °C per decade · r² = 0.34 · p = < 0.001

19402025

Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).

A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.

Records for the period

Hottest day

40.5 °C

5 August 1946

Coldest day

-15.2 °C

17 January 1945

Wettest day

176 mm

4 August 1960

Windiest day

48.5 km/h

8 August 2012

Strongest gust

110.5 km/h

2 August 1956

Hottest feels-like

48.8 °C

4 August 2024

Coldest feels-like

-20.5 °C

17 January 1945

Snowiest day

24.5 cm

18 January 1984

Sunniest day

14.0 h

19 June 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	37.3 °C5 July 2025	-7.2 °C9 February 2025	18.4 °C	1,077 mm	107	30
2024	40.2 °C4 August 2024	-5.9 °C23 January 2024	17.8 °C	1,370 mm	92	33
2023	36.3 °C12 July 2023	-8.3 °C25 January 2023	17.4 °C	1,412 mm	85	27
2022	40.0 °C14 August 2022	-4.2 °C18 December 2022	17.6 °C	987 mm	86	30
2021	37.3 °C14 July 2021	-7.9 °C8 January 2021	17.8 °C	1,220 mm	91	25
2020	36.7 °C20 August 2020	-7.1 °C31 December 2020	17.3 °C	1,679 mm	62	17
2019	36.7 °C29 July 2019	-3.0 °C27 January 2019	17.3 °C	834 mm	66	19
2018	37.1 °C26 June 2018	-9.3 °C30 January 2018	17.4 °C	1,167 mm	89	39
2017	39.7 °C23 July 2017	-4.9 °C21 January 2017	17.4 °C	975 mm	69	20
2016	38.1 °C24 July 2016	-8.7 °C24 January 2016	17.2 °C	1,747 mm	76	37
2015	37.0 °C3 August 2015	-4.9 °C9 February 2015	16.7 °C	1,708 mm	45	18
2014	35.7 °C4 August 2014	-5.2 °C22 January 2014	16.7 °C	1,199 mm	43	30
2013	39.1 °C6 August 2013	-4.9 °C4 January 2013	17.2 °C	973 mm	89	39
2012	37.4 °C5 July 2012	-5.2 °C23 January 2012	16.4 °C	1,079 mm	67	39
2011	36.7 °C25 July 2011	-7.3 °C16 January 2011	16.5 °C	977 mm	73	54
2010	38.2 °C12 August 2010	-5.7 °C14 January 2010	16.7 °C	1,009 mm	80	33
2009	36.5 °C17 July 2009	-7.2 °C24 January 2009	17.0 °C	1,216 mm	79	31
2008	37.4 °C5 July 2008	-6.4 °C22 December 2008	16.7 °C	1,257 mm	71	48
2007	36.9 °C28 July 2007	-2.8 °C9 January 2007	17.7 °C	1,010 mm	84	18
2006	37.1 °C13 August 2006	-4.7 °C7 January 2006	17.4 °C	1,064 mm	83	21
2005	39.7 °C3 July 2005	-6.4 °C2 January 2005	17.0 °C	868 mm	89	55
2004	36.8 °C24 July 2004	-6.5 °C25 January 2004	17.1 °C	1,118 mm	74	26
2003	38.3 °C2 August 2003	-6.1 °C5 January 2003	16.6 °C	1,059 mm	61	37
2002	37.6 °C15 July 2002	-4.2 °C27 December 2002	17.1 °C	1,569 mm	71	25
2001	36.9 °C2 July 2001	-5.1 °C15 January 2001	16.7 °C	1,299 mm	52	25
2000	36.0 °C22 July 2000	-5.9 °C25 January 2000	16.7 °C	1,139 mm	74	24
1999	35.2 °C11 September 1999	-5.9 °C22 December 1999	16.3 °C	1,737 mm	45	26
1998	37.2 °C10 August 1998	-6.2 °C19 January 1998	17.2 °C	1,513 mm	64	25
1997	36.3 °C5 June 1997	-5.3 °C8 January 1997	16.6 °C	1,092 mm	77	29
1996	35.0 °C7 August 1996	-5.3 °C10 February 1996	15.9 °C	1,482 mm	62	36
1995	36.8 °C20 July 1995	-4.3 °C5 February 1995	16.1 °C	1,081 mm	67	33
1994	36.2 °C1 July 1994	-4.4 °C19 January 1994	17.2 °C	883 mm	84	22
1993	35.7 °C12 July 1993	-7.3 °C17 January 1993	15.6 °C	1,725 mm	39	40
1992	37.0 °C30 July 1992	-5.0 °C15 January 1992	15.7 °C	1,150 mm	52	34
1991	35.2 °C22 July 1991	-8.6 °C29 December 1991	15.7 °C	1,830 mm	51	25
1990	36.8 °C24 July 1990	-7.8 °C1 February 1990	16.6 °C	1,512 mm	77	33
1989	36.3 °C12 August 1989	-4.7 °C15 January 1989	15.7 °C	1,524 mm	39	25
1988	37.6 °C8 July 1988	-5.2 °C17 December 1988	15.7 °C	1,036 mm	59	35
1987	35.1 °C11 July 1987	-6.5 °C14 January 1987	15.7 °C	1,633 mm	50	41
1986	36.0 °C12 August 1986	-7.4 °C5 January 1986	15.5 °C	1,181 mm	59	42
1985	35.9 °C16 July 1985	-6.4 °C12 December 1985	15.6 °C	1,585 mm	66	48
1984	35.8 °C26 July 1984	-9.0 °C23 January 1984	15.3 °C	1,256 mm	62	60
1983	37.4 °C3 August 1983	-6.4 °C19 February 1983	15.8 °C	1,471 mm	45	38
1982	34.2 °C8 July 1982	-7.5 °C19 January 1982	15.9 °C	1,132 mm	48	35
1981	35.3 °C19 June 1981	-7.6 °C3 January 1981	15.5 °C	1,260 mm	61	48
1980	36.1 °C27 July 1980	-10.2 °C8 February 1980	14.9 °C	1,477 mm	34	50
1979	35.7 °C6 August 1979	-7.3 °C15 January 1979	16.1 °C	986 mm	58	35
1978	37.7 °C8 July 1978	-7.1 °C2 February 1978	16.2 °C	720 mm	81	44
1977	36.7 °C6 August 1977	-11.9 °C31 January 1977	15.6 °C	1,798 mm	42	51
1976	36.7 °C5 August 1976	-6.8 °C29 December 1976	15.2 °C	1,144 mm	45	44
1975	35.3 °C19 July 1975	-5.2 °C17 December 1975	16.0 °C	1,563 mm	67	43
1974	35.6 °C23 July 1974	-4.9 °C13 January 1974	15.6 °C	1,244 mm	43	43
1973	35.0 °C5 August 1973	-8.3 °C26 December 1973	15.9 °C	1,305 mm	62	31
1972	35.2 °C7 July 1972	-6.8 °C10 February 1972	15.2 °C	1,262 mm	52	48
1971	36.6 °C18 August 1971	-7.3 °C5 January 1971	15.8 °C	1,094 mm	70	54
1970	35.4 °C7 August 1970	-9.2 °C5 January 1970	15.4 °C	1,473 mm	61	39
1969	36.3 °C17 August 1969	-14.0 °C6 February 1969	15.3 °C	1,268 mm	59	67
1968	34.9 °C20 July 1968	-6.6 °C16 January 1968	15.8 °C	993 mm	60	55
1967	37.2 °C12 August 1967	-9.2 °C16 January 1967	15.6 °C	1,062 mm	81	81
1966	38.2 °C6 August 1966	-10.1 °C27 December 1966	16.3 °C	1,211 mm	59	32
1965	35.0 °C20 July 1965	-7.1 °C17 December 1965	15.6 °C	1,237 mm	49	40
1964	37.6 °C16 July 1964	-6.2 °C18 February 1964	16.3 °C	1,196 mm	78	40
1963	36.2 °C28 July 1963	-8.7 °C4 February 1963	15.7 °C	1,358 mm	65	55
1962	37.2 °C19 July 1962	-5.5 °C31 January 1962	15.8 °C	1,485 mm	46	43
1961	36.2 °C23 July 1961	-6.0 °C12 January 1961	16.7 °C	1,256 mm	80	28
1960	36.1 °C12 July 1960	-6.2 °C19 December 1960	16.1 °C	1,757 mm	59	35
1959	39.0 °C21 August 1959	-8.4 °C17 January 1959	16.2 °C	1,087 mm	69	37
1958	36.7 °C22 July 1958	-10.0 °C16 January 1958	15.6 °C	1,072 mm	67	43
1957	36.6 °C22 July 1957	-13.5 °C12 February 1957	15.2 °C	1,781 mm	44	46
1956	37.1 °C12 July 1956	-9.8 °C24 January 1956	15.5 °C	1,708 mm	70	58
1955	36.4 °C12 September 1955	-11.8 °C6 January 1955	16.3 °C	1,127 mm	74	37
1954	36.2 °C12 August 1954	-12.5 °C30 January 1954	15.9 °C	1,900 mm	56	41
1953	37.8 °C28 July 1953	-8.7 °C18 January 1953	16.7 °C	1,314 mm	72	32
1952	34.4 °C2 August 1952	-7.1 °C19 February 1952	15.9 °C	1,735 mm	59	32
1951	37.2 °C8 August 1951	-10.9 °C13 January 1951	15.8 °C	1,548 mm	53	42
1950	35.3 °C13 July 1950	-5.9 °C5 February 1950	16.2 °C	1,527 mm	56	39
1949	34.6 °C17 September 1949	-5.9 °C6 January 1949	16.4 °C	1,645 mm	51	33
1948	34.3 °C8 August 1948	-8.9 °C26 January 1948	16.7 °C	1,351 mm	60	32
1947	35.2 °C29 July 1947	-6.3 °C19 December 1947	16.1 °C	1,079 mm	64	41
1946	40.5 °C5 August 1946	-5.8 °C4 January 1946	17.5 °C	744 mm	111	41
1945	34.6 °C4 June 1945	-15.2 °C17 January 1945	15.7 °C	975 mm	83	66
1944	35.9 °C29 June 1944	-6.7 °C20 December 1944	16.4 °C	810 mm	84	57
1943	33.5 °C3 August 1943	-7.5 °C12 January 1943	15.8 °C	1,738 mm	21	50
1942	35.9 °C7 August 1942	-6.9 °C17 January 1942	16.1 °C	1,403 mm	61	49
1941	33.9 °C12 June 1941	-7.4 °C25 January 1941	16.3 °C	1,328 mm	50	37
1940	34.2 °C14 August 1940	-7.5 °C4 February 1940	16.1 °C	967 mm	70	47

Normals computed over complete calendar years 1940–2025.

A specific year

Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?

Year

Across the whole year

Average daily high

22.8 °C

+2.6 °C

Hot days (≥ 30 °C)

107 d/yr

+42

Frost days (< 0 °C)

30 d/yr

-8

Annual rainfall

1078 mm

-212 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	10.7 °C	+3.5 °C	10 mm	-34 mm
Feb	9.9 °C	+0.9 °C	15 mm	-42 mm
Mar	17.1 °C	+3.4 °C	53 mm	-32 mm
Apr	25.3 °C	+5.4 °C	37 mm	-69 mm
May	27.3 °C	+2.5 °C	120 mm	-18 mm
Jun	29.2 °C	+1.0 °C	273 mm	+26 mm
Jul	33.7 °C	+1.9 °C	202 mm	-11 mm
Aug	34.0 °C	+2.4 °C	144 mm	-2 mm
Sep	30.3 °C	+3.0 °C	151 mm	+33 mm
Oct	24.1 °C	+1.9 °C	54 mm	-2 mm
Nov	17.8 °C	+1.5 °C	12 mm	-36 mm
Dec	13.0 °C	+3.1 °C	8 mm	-25 mm

The year's extremes

Hottest day

37.3 °C

5 Jul 2025

Coldest day

-7.2 °C

9 Feb 2025

Wettest day

118.6 mm

30 Jul 2025

Windiest day

39.8 km/h

12 Apr 2025

Strongest gust

77.8 km/h

8 May 2025

Hottest feels-like

45.0 °C

5 Jul 2025

Coldest feels-like

-11.4 °C

9 Feb 2025

Sunniest day

14.0 h

5 Jun 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Changzhou?

Changzhou has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.2 °C and it receives 1,289 mm of precipitation per year.

What is the hottest day ever recorded in Changzhou?

The hottest day measured in Changzhou between 1940 and 2025 was 5 August 1946, reaching 40.5 °C.

What is the coldest day in Changzhou?

The coldest day measured in Changzhou between 1940 and 2025 was 17 January 1945, at -15.2 °C.

Does it snow in Changzhou?

Yes. Changzhou gets on average 11.2 cm of snow per year and has around 38 frost days.

Has the climate of Changzhou warmed?

Yes: Changzhou warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Changzhou?

The wettest day measured in Changzhou between 1940 and 2025 was 4 August 1960, with 176 mm of rain in 24 hours.

What was the windiest day in Changzhou?

The windiest day measured in Changzhou between 1940 and 2025 was 8 August 2012, with winds reaching 48.5 km/h.

What is the warmest month in Changzhou?

The warmest month in Changzhou is July (28.6 °C on average); the coldest is January (3.3 °C).

How much does it rain in Changzhou?

Changzhou receives on average 1,289 mm of precipitation per year, spread over about 120 rainy days.

Is it sunny in Changzhou?

Changzhou gets on average 7.8 hours of sunshine per day, roughly 2,847 hours per year over 1940-2025.

What is the biggest single-day snowfall in Changzhou?

The heaviest 24-hour snowfall measured in Changzhou between 1940 and 2025 was 18 January 1984, with 24.5 cm.

Are there tropical nights in Changzhou?

Yes: Changzhou has on average 105 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Changzhou?

In Changzhou, between 1940 and 2025, the highest apparent temperature reached 48.8 °C on 4 August 2024, and the lowest was -20.5 °C on 17 January 1945.

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