Haimen climate — normals and trends

Q: What is the climate of Haimen?

Haimen has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 22.0 °C and it receives 1,437 mm of precipitation per year.

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

The hottest day measured in Haimen between 1940 and 2025 was 1 July 2004, reaching 37.3 °C.

Q: What is the coldest day in Haimen?

The coldest day measured in Haimen between 1940 and 2025 was 11 January 1955, at 1.1 °C.

Q: Does it snow in Haimen?

Almost never: Haimen sees virtually no snow, with about 0 frost days per year.

Q: Has the climate of Haimen warmed?

Yes: Haimen warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Haimen?

The wettest day measured in Haimen between 1940 and 2025 was 22 August 1990, with 194 mm of rain in 24 hours.

Q: What was the windiest day in Haimen?

The windiest day measured in Haimen between 1940 and 2025 was 2 September 1953, with winds reaching 73.6 km/h.

Q: What is the warmest month in Haimen?

The warmest month in Haimen is July (28.3 °C on average); the coldest is January (14.3 °C).

Q: How much does it rain in Haimen?

Haimen receives on average 1,437 mm of precipitation per year, spread over about 149 rainy days.

Q: Is it sunny in Haimen?

Haimen gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.

Haimen (China) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 22.0 °C and it receives 1,437 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 (28.3 °C on average) and the coldest is January (14.3 °C). Rainfall peaks in June.

Haimen averages 0 frost days, 81 hot days (≥ 30 °C) and 149 rainy days per year.

Haimen has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.

The hottest day of the period reached 37.3 °C (on 1 July 2004) and the coldest 1.1 °C (on 11 January 1955).

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

HaimenGuangdong

coords: 23.19°, 116.61°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJulyColdest monthJanuaryWettest monthJuneDriest monthJanuary

Mean daily temperature

22.0°C

Average daily high

25.1°C

Average daily low

19.6°C

Annual rainfall

1,437mm

Sunshine / day

8.9h

Mean relative humidity

79%

Average peak wind

17.6km/h

Seasonal range

14.0°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

81 d/yr

Rainy days (≥ 1 mm)

149 d/yr

Annual snowfall

0.0 cm

Average feels-like high

27.3 °C

Average feels-like low

21.0 °C

Average peak gust

36.7 km/h

Tropical nights (≥ 20 °C)

193 d/yr

Solar radiation

16.0 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.9 °C

since 1940

+0.2 °C per decade · r² = 0.72 · 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

37.3 °C

1 July 2004

Coldest day

1.1 °C

11 January 1955

Wettest day

194 mm

22 August 1990

Windiest day

73.6 km/h

2 September 1953

Strongest gust

154.1 km/h

19 July 1988

Hottest feels-like

45.7 °C

4 August 2024

Coldest feels-like

-4.4 °C

25 January 2016

Snowiest day

0.1 cm

24 January 2016

Sunniest day

13.1 h

21 June 1946

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	35.1 °C26 July 2025	7.4 °C12 January 2025	23.1 °C	1,775 mm	134
2024	35.5 °C4 August 2024	4.4 °C24 January 2024	23.4 °C	1,998 mm	115
2023	35.8 °C30 May 2023	6.5 °C29 January 2023	23.3 °C	1,541 mm	114
2022	35.5 °C24 July 2022	7.2 °C19 December 2022	22.8 °C	1,619 mm	116
2021	35.3 °C28 May 2021	4.2 °C13 January 2021	23.4 °C	1,131 mm	138
2020	36.0 °C14 July 2020	5.3 °C31 December 2020	23.3 °C	1,002 mm	113
2019	36.5 °C9 August 2019	9.2 °C23 January 2019	23.3 °C	1,318 mm	118
2018	35.9 °C27 May 2018	5.3 °C6 February 2018	22.9 °C	1,231 mm	111
2017	35.7 °C30 July 2017	8.2 °C12 February 2017	23.0 °C	1,355 mm	113
2016	35.7 °C8 July 2016	1.6 °C25 January 2016	22.9 °C	2,135 mm	114
2015	35.0 °C21 August 2015	7.1 °C15 January 2015	23.1 °C	1,462 mm	106
2014	35.6 °C1 August 2014	5.4 °C20 February 2014	22.6 °C	1,313 mm	120
2013	34.2 °C9 August 2013	5.6 °C29 December 2013	22.5 °C	1,678 mm	90
2012	36.1 °C1 August 2012	4.9 °C31 December 2012	22.5 °C	1,477 mm	95
2011	33.9 °C25 June 2011	6.1 °C12 January 2011	22.1 °C	1,468 mm	92
2010	34.8 °C5 July 2010	2.7 °C17 December 2010	22.4 °C	1,530 mm	95
2009	35.3 °C7 August 2009	5.2 °C11 January 2009	22.8 °C	978 mm	111
2008	36.0 °C27 July 2008	6.7 °C3 February 2008	22.5 °C	1,439 mm	95
2007	33.7 °C10 July 2007	6.6 °C4 February 2007	22.8 °C	1,431 mm	105
2006	35.7 °C13 July 2006	6.2 °C7 January 2006	22.6 °C	1,974 mm	86
2005	35.8 °C19 July 2005	3.1 °C1 January 2005	22.3 °C	1,308 mm	95
2004	37.3 °C1 July 2004	5.4 °C25 January 2004	22.4 °C	1,025 mm	111
2003	34.8 °C15 July 2003	7.4 °C28 January 2003	22.4 °C	1,230 mm	91
2002	34.3 °C4 July 2002	7.2 °C27 December 2002	22.9 °C	1,184 mm	91
2001	34.2 °C4 July 2001	6.2 °C22 December 2001	22.7 °C	1,548 mm	101
2000	36.5 °C5 June 2000	5.8 °C27 January 2000	22.5 °C	1,461 mm	98
1999	33.9 °C18 August 1999	2.5 °C23 December 1999	22.6 °C	1,604 mm	99
1998	35.8 °C4 August 1998	8.8 °C18 January 1998	23.1 °C	1,795 mm	106
1997	34.8 °C29 August 1997	6.6 °C11 January 1997	22.3 °C	1,845 mm	76
1996	34.6 °C31 July 1996	6.8 °C20 February 1996	22.0 °C	1,602 mm	99
1995	34.8 °C22 July 1995	6.4 °C6 January 1995	21.8 °C	1,390 mm	77
1994	34.9 °C10 July 1994	5.4 °C21 January 1994	22.3 °C	1,416 mm	70
1993	33.0 °C29 July 1993	4.5 °C16 January 1993	21.8 °C	1,417 mm	85
1992	33.4 °C29 July 1992	5.2 °C15 January 1992	21.7 °C	1,769 mm	75
1991	34.0 °C23 August 1991	2.1 °C29 December 1991	22.4 °C	1,434 mm	103
1990	35.9 °C17 August 1990	4.9 °C1 February 1990	22.2 °C	1,902 mm	77
1989	34.0 °C14 August 1989	5.9 °C14 January 1989	21.8 °C	1,508 mm	88
1988	34.4 °C6 July 1988	8.0 °C13 December 1988	21.8 °C	1,328 mm	92
1987	34.2 °C12 July 1987	6.6 °C7 December 1987	22.2 °C	1,321 mm	72
1986	33.8 °C1 August 1986	4.1 °C1 March 1986	21.6 °C	1,789 mm	75
1985	33.4 °C22 June 1985	5.2 °C16 December 1985	21.5 °C	1,743 mm	53
1984	33.4 °C28 August 1984	5.5 °C9 January 1984	21.3 °C	1,393 mm	68
1983	33.0 °C28 June 1983	4.6 °C30 December 1983	21.7 °C	1,998 mm	92
1982	36.6 °C28 July 1982	5.4 °C28 December 1982	21.8 °C	1,452 mm	77
1981	33.3 °C21 August 1981	5.6 °C12 January 1981	21.9 °C	1,423 mm	67
1980	34.5 °C10 July 1980	3.7 °C31 January 1980	21.8 °C	1,209 mm	89
1979	35.0 °C4 July 1979	3.7 °C1 February 1979	21.9 °C	1,431 mm	74
1978	34.2 °C18 August 1978	5.5 °C18 February 1978	21.9 °C	1,819 mm	91
1977	33.4 °C8 August 1977	4.7 °C5 January 1977	22.1 °C	1,231 mm	91
1976	34.0 °C17 July 1976	5.1 °C28 December 1976	21.5 °C	1,518 mm	63
1975	33.6 °C28 July 1975	3.8 °C14 December 1975	22.1 °C	1,937 mm	88
1974	34.3 °C20 August 1974	3.1 °C26 February 1974	21.9 °C	1,684 mm	85
1973	33.0 °C30 July 1973	5.4 °C3 January 1973	22.3 °C	2,099 mm	72
1972	33.6 °C22 July 1972	3.5 °C9 February 1972	21.9 °C	1,759 mm	75
1971	35.2 °C25 July 1971	5.8 °C31 January 1971	21.5 °C	1,455 mm	94
1970	33.7 °C2 July 1970	4.9 °C21 January 1970	21.7 °C	1,578 mm	92
1969	34.5 °C26 September 1969	3.4 °C5 February 1969	21.5 °C	1,381 mm	93
1968	33.6 °C29 July 1968	5.9 °C15 February 1968	21.7 °C	1,632 mm	67
1967	34.5 °C29 June 1967	2.4 °C16 January 1967	21.7 °C	1,137 mm	93
1966	33.3 °C16 August 1966	5.9 °C23 February 1966	21.8 °C	1,381 mm	40
1965	32.2 °C13 July 1965	5.9 °C10 January 1965	21.1 °C	1,459 mm	24
1964	33.8 °C7 August 1964	6.6 °C26 February 1964	22.1 °C	1,374 mm	74
1963	34.3 °C16 July 1963	2.8 °C28 January 1963	22.1 °C	805 mm	100
1962	35.3 °C2 August 1962	3.8 °C2 January 1962	21.9 °C	1,086 mm	94
1961	33.8 °C25 August 1961	5.6 °C18 January 1961	22.2 °C	2,209 mm	79
1960	33.9 °C22 August 1960	5.2 °C4 January 1960	22.2 °C	1,647 mm	81
1959	34.1 °C29 August 1959	3.7 °C11 January 1959	22.3 °C	1,441 mm	77
1958	34.9 °C15 July 1958	5.5 °C16 January 1958	21.8 °C	1,278 mm	77
1957	33.9 °C10 August 1957	2.8 °C12 February 1957	21.6 °C	1,462 mm	67
1956	36.7 °C3 September 1956	2.0 °C9 January 1956	21.6 °C	867 mm	100
1955	32.6 °C24 August 1955	1.1 °C11 January 1955	21.1 °C	920 mm	37
1954	34.1 °C15 August 1954	5.5 °C16 December 1954	21.6 °C	1,081 mm	82
1953	34.0 °C16 August 1953	5.7 °C7 January 1953	21.6 °C	1,223 mm	66
1952	32.9 °C10 June 1952	4.7 °C19 February 1952	21.9 °C	1,122 mm	64
1951	32.5 °C31 July 1951	4.8 °C14 January 1951	21.5 °C	1,297 mm	37
1950	31.8 °C20 July 1950	4.5 °C10 December 1950	21.3 °C	1,366 mm	27
1949	32.1 °C8 June 1949	3.6 °C9 January 1949	21.6 °C	1,072 mm	50
1948	33.2 °C6 July 1948	5.5 °C27 January 1948	21.4 °C	1,020 mm	43
1947	31.5 °C29 July 1947	5.9 °C24 February 1947	20.7 °C	1,811 mm	13
1946	32.4 °C25 September 1946	4.6 °C6 January 1946	21.6 °C	864 mm	52
1945	32.3 °C31 July 1945	5.0 °C17 January 1945	20.7 °C	1,631 mm	29
1944	31.7 °C7 July 1944	4.5 °C19 December 1944	21.0 °C	1,271 mm	17
1943	34.1 °C27 May 1943	4.7 °C12 January 1943	21.4 °C	528 mm	74
1942	33.0 °C15 August 1942	4.9 °C7 December 1942	21.1 °C	1,307 mm	42
1941	31.8 °C8 August 1941	6.7 °C5 February 1941	21.1 °C	1,425 mm	28
1940	33.4 °C30 August 1940	2.6 °C24 January 1940	20.6 °C	983 mm	29

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

26.3 °C

+1.2 °C

Hot days (≥ 30 °C)

134 d/yr

+53

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1775 mm

+338 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	19.1 °C	+1.3 °C	4 mm	-23 mm
Feb	18.3 °C	0.0 °C	58 mm	+14 mm
Mar	22.0 °C	+1.1 °C	81 mm	+21 mm
Apr	26.3 °C	+1.7 °C	112 mm	+15 mm
May	28.7 °C	+1.0 °C	178 mm	-12 mm
Jun	30.9 °C	+1.3 °C	176 mm	-74 mm
Jul	32.0 °C	+1.0 °C	373 mm	+165 mm
Aug	31.3 °C	+0.6 °C	310 mm	+74 mm
Sep	31.6 °C	+1.9 °C	360 mm	+181 mm
Oct	29.3 °C	+2.3 °C	73 mm	+5 mm
Nov	23.9 °C	+0.2 °C	32 mm	-16 mm
Dec	21.7 °C	+2.0 °C	18 mm	-11 mm

The year's extremes

Hottest day

35.1 °C

26 Jul 2025

Coldest day

7.4 °C

12 Jan 2025

Wettest day

87.1 mm

19 Sep 2025

Windiest day

49.0 km/h

24 Sep 2025

Strongest gust

102.2 km/h

20 Jul 2025

Hottest feels-like

42.6 °C

17 Jul 2025

Coldest feels-like

3.5 °C

12 Jan 2025

Sunniest day

13.0 h

21 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 Haimen?

Haimen has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 22.0 °C and it receives 1,437 mm of precipitation per year.

What is the hottest day ever recorded in Haimen?

The hottest day measured in Haimen between 1940 and 2025 was 1 July 2004, reaching 37.3 °C.

What is the coldest day in Haimen?

The coldest day measured in Haimen between 1940 and 2025 was 11 January 1955, at 1.1 °C.

Does it snow in Haimen?

Almost never: Haimen sees virtually no snow, with about 0 frost days per year.

Has the climate of Haimen warmed?

Yes: Haimen warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Haimen?

The wettest day measured in Haimen between 1940 and 2025 was 22 August 1990, with 194 mm of rain in 24 hours.

What was the windiest day in Haimen?

The windiest day measured in Haimen between 1940 and 2025 was 2 September 1953, with winds reaching 73.6 km/h.

What is the warmest month in Haimen?

The warmest month in Haimen is July (28.3 °C on average); the coldest is January (14.3 °C).

How much does it rain in Haimen?

Haimen receives on average 1,437 mm of precipitation per year, spread over about 149 rainy days.

Is it sunny in Haimen?

Haimen gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.

What is the biggest single-day snowfall in Haimen?

The heaviest 24-hour snowfall measured in Haimen between 1940 and 2025 was 24 January 2016, with 0.1 cm.

Are there tropical nights in Haimen?

Yes: Haimen has on average 193 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Haimen?

In Haimen, between 1940 and 2025, the highest apparent temperature reached 45.7 °C on 4 August 2024, and the lowest was -4.4 °C on 25 January 2016.

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