Helin climate — normals and trends

Q: What is the climate of Helin?

Helin has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 17.5 °C and it receives 1,784 mm of precipitation per year.

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

The hottest day measured in Helin between 1940 and 2025 was 18 August 2022, reaching 40.6 °C.

Q: What is the coldest day in Helin?

The coldest day measured in Helin between 1940 and 2025 was 12 February 1945, at -6.9 °C.

Q: Does it snow in Helin?

Yes. Helin gets on average 4.5 cm of snow per year and has around 3 frost days.

Q: Has the climate of Helin warmed?

Yes: Helin warmed by +0.9 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Helin?

The wettest day measured in Helin between 1940 and 2025 was 17 July 1982, with 188 mm of rain in 24 hours.

Q: What was the windiest day in Helin?

The windiest day measured in Helin between 1940 and 2025 was 23 May 1946, with winds reaching 43.3 km/h.

Q: What is the warmest month in Helin?

The warmest month in Helin is August (27.5 °C on average); the coldest is January (6.9 °C).

Q: How much does it rain in Helin?

Helin receives on average 1,784 mm of precipitation per year, spread over about 177 rainy days.

Q: Is it sunny in Helin?

Helin gets on average 6.0 hours of sunshine per day, roughly 2,190 hours per year over 1940-2025.

Helin (China) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 17.5 °C and it receives 1,784 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 August (27.5 °C on average) and the coldest is January (6.9 °C). Rainfall peaks in July.

Helin averages 3 frost days, 66 hot days (≥ 30 °C) and 177 rainy days per year.

Helin has warmed by +0.9 °C between 1940 and 2025, or +0.11 °C per decade. This trend is statistically significant.

The number of frost days there went from about 6 to 0 per year over the period.

The hottest day of the period reached 40.6 °C (on 18 August 2022) and the coldest -6.9 °C (on 12 February 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

HelinChongqing Municipality

coords: 30.58°, 107.68°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthJulyDriest monthJanuary

Mean daily temperature

17.5°C

Average daily high

20.9°C

Average daily low

14.5°C

Annual rainfall

1,784mm

Sunshine / day

6.0h

Mean relative humidity

79%

Average peak wind

8.4km/h

Seasonal range

20.6°C

Frost days (< 0 °C)

3 d/yr

Hot days (≥ 30 °C)

66 d/yr

Rainy days (≥ 1 mm)

177 d/yr

Annual snowfall

4.5 cm

Average feels-like high

22.2 °C

Average feels-like low

15.1 °C

Average peak gust

21.0 km/h

Tropical nights (≥ 20 °C)

107 d/yr

Solar radiation

11.6 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+0.9 °C

since 1940

+0.1 °C per decade · r² = 0.28 · 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

40.6 °C

18 August 2022

Coldest day

-6.9 °C

12 February 1945

Wettest day

188 mm

17 July 1982

Windiest day

43.3 km/h

23 May 1946

Strongest gust

68.4 km/h

28 May 1946

Hottest feels-like

46.6 °C

25 July 1957

Coldest feels-like

-10.8 °C

12 February 1945

Snowiest day

9.7 cm

22 February 1966

Sunniest day

13.9 h

29 June 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	38.5 °C16 July 2025	0.3 °C27 January 2025	18.8 °C	1,662 mm	102	0
2024	38.6 °C4 September 2024	0.8 °C16 December 2024	19.0 °C	1,549 mm	98	0
2023	36.6 °C23 July 2023	0.2 °C29 January 2023	18.3 °C	1,981 mm	79	0
2022	40.6 °C18 August 2022	-1.7 °C19 December 2022	18.6 °C	1,281 mm	89	1
2021	38.6 °C2 August 2021	-1.9 °C12 January 2021	17.9 °C	1,842 mm	78	5
2020	36.9 °C5 August 2020	-0.4 °C22 December 2020	17.8 °C	1,875 mm	69	1
2019	37.2 °C28 July 2019	1.7 °C22 January 2019	17.8 °C	1,421 mm	64	0
2018	38.4 °C20 July 2018	-0.6 °C12 January 2018	17.9 °C	1,483 mm	84	3
2017	38.5 °C27 July 2017	1.2 °C21 December 2017	17.9 °C	1,575 mm	70	0
2016	38.4 °C24 August 2016	-3.9 °C25 January 2016	18.1 °C	1,450 mm	81	3
2015	35.3 °C12 July 2015	0.1 °C17 December 2015	18.2 °C	1,431 mm	68	0
2014	37.5 °C23 July 2014	0.1 °C18 January 2014	17.5 °C	2,045 mm	49	0
2013	37.7 °C25 July 2013	-2.5 °C1 January 2013	18.3 °C	1,339 mm	95	2
2012	37.2 °C12 August 2012	-2.8 °C30 December 2012	17.1 °C	1,379 mm	63	2
2011	37.6 °C18 August 2011	-2.4 °C2 February 2011	17.4 °C	1,393 mm	81	3
2010	38.9 °C11 August 2010	-2.7 °C17 December 2010	17.6 °C	1,336 mm	72	3
2009	38.0 °C7 September 2009	0.5 °C10 January 2009	17.9 °C	1,384 mm	80	0
2008	35.5 °C23 September 2008	-1.6 °C15 February 2008	17.4 °C	1,692 mm	62	5
2007	35.5 °C7 August 2007	0.1 °C9 January 2007	17.9 °C	1,618 mm	72	0
2006	40.3 °C15 August 2006	0.7 °C10 January 2006	18.5 °C	1,280 mm	90	0
2005	35.7 °C1 July 2005	-0.9 °C2 January 2005	17.4 °C	1,816 mm	75	4
2004	38.6 °C11 August 2004	-2.6 °C31 December 2004	17.6 °C	1,874 mm	63	2
2003	37.1 °C2 August 2003	0.5 °C7 January 2003	17.8 °C	1,883 mm	60	0
2002	36.8 °C13 July 2002	0.7 °C2 February 2002	17.9 °C	1,861 mm	67	0
2001	37.4 °C6 August 2001	-0.9 °C23 December 2001	18.1 °C	1,528 mm	67	1
2000	36.9 °C27 July 2000	-0.4 °C1 February 2000	17.4 °C	2,127 mm	64	1
1999	36.0 °C8 August 1999	-1.6 °C23 December 1999	17.8 °C	2,058 mm	69	5
1998	35.7 °C23 August 1998	-0.2 °C20 January 1998	18.3 °C	2,270 mm	72	1
1997	36.7 °C31 August 1997	0.6 °C28 January 1997	17.6 °C	1,749 mm	71	0
1996	36.6 °C22 August 1996	-0.9 °C3 January 1996	16.9 °C	2,020 mm	70	2
1995	38.2 °C6 September 1995	-0.2 °C6 January 1995	17.4 °C	1,769 mm	72	2
1994	39.1 °C5 August 1994	-0.2 °C23 January 1994	18.0 °C	1,746 mm	84	1
1993	35.7 °C13 July 1993	-0.9 °C25 January 1993	17.0 °C	2,096 mm	47	4
1992	39.0 °C11 August 1992	-0.2 °C24 December 1992	17.1 °C	1,633 mm	70	1
1991	37.0 °C25 July 1991	-2.9 °C28 December 1991	17.3 °C	1,865 mm	66	3
1990	37.1 °C27 August 1990	1.6 °C24 January 1990	18.0 °C	1,605 mm	87	0
1989	37.4 °C22 July 1989	-1.6 °C25 February 1989	16.9 °C	2,099 mm	49	3
1988	37.5 °C19 July 1988	2.0 °C11 December 1988	17.4 °C	1,662 mm	68	0
1987	35.1 °C23 May 1987	1.2 °C27 January 1987	17.6 °C	2,113 mm	50	0
1986	36.3 °C11 August 1986	-0.1 °C2 March 1986	17.0 °C	1,844 mm	61	1
1985	36.3 °C5 August 1985	0.1 °C18 January 1985	17.2 °C	1,814 mm	63	0
1984	36.3 °C2 August 1984	-1.0 °C21 January 1984	17.1 °C	1,806 mm	63	2
1983	34.7 °C25 July 1983	-0.3 °C29 December 1983	17.3 °C	1,941 mm	46	1
1982	35.7 °C1 September 1982	-2.4 °C27 December 1982	16.9 °C	2,248 mm	48	3
1981	36.4 °C9 August 1981	-0.9 °C23 December 1981	17.4 °C	1,586 mm	75	2
1980	36.6 °C28 July 1980	0.5 °C31 January 1980	17.3 °C	1,906 mm	46	0
1979	36.3 °C9 August 1979	0.1 °C31 January 1979	17.7 °C	1,905 mm	56	0
1978	37.1 °C3 August 1978	-1.2 °C19 January 1978	17.8 °C	1,332 mm	78	4
1977	37.6 °C8 August 1977	-3.8 °C30 January 1977	17.2 °C	1,665 mm	66	7
1976	37.7 °C6 August 1976	-1.2 °C29 December 1976	16.9 °C	1,660 mm	54	2
1975	39.4 °C10 September 1975	-4.5 °C15 December 1975	17.8 °C	1,633 mm	75	9
1974	36.0 °C30 July 1974	-1.1 °C2 January 1974	17.2 °C	1,966 mm	53	2
1973	36.5 °C21 August 1973	1.6 °C2 January 1973	17.9 °C	1,877 mm	72	0
1972	38.4 °C26 August 1972	-0.3 °C8 February 1972	17.5 °C	1,766 mm	78	2
1971	37.6 °C20 August 1971	-0.5 °C31 January 1971	17.6 °C	1,559 mm	70	1
1970	37.3 °C17 August 1970	-0.4 °C8 January 1970	17.3 °C	2,020 mm	67	2
1969	37.2 °C28 July 1969	-1.3 °C31 January 1969	17.7 °C	1,614 mm	71	3
1968	35.8 °C31 July 1968	0.8 °C7 February 1968	17.1 °C	1,897 mm	51	0
1967	38.1 °C30 August 1967	-1.6 °C16 January 1967	17.3 °C	2,085 mm	68	9
1966	34.1 °C21 July 1966	-3.1 °C29 December 1966	16.8 °C	1,889 mm	48	7
1965	32.4 °C29 July 1965	-5.0 °C20 December 1965	16.4 °C	2,039 mm	31	9
1964	37.0 °C22 July 1964	0.2 °C28 January 1964	17.7 °C	2,237 mm	65	0
1963	36.0 °C15 July 1963	-3.2 °C15 January 1963	18.2 °C	1,975 mm	76	6
1962	36.9 °C18 July 1962	-1.2 °C26 January 1962	17.5 °C	1,717 mm	70	2
1961	38.8 °C23 July 1961	-2.5 °C17 January 1961	18.2 °C	1,685 mm	96	3
1960	37.9 °C30 August 1960	-1.2 °C2 January 1960	17.9 °C	1,939 mm	74	3
1959	38.3 °C24 August 1959	-1.5 °C13 January 1959	18.0 °C	1,393 mm	90	3
1958	35.9 °C27 July 1958	-1.4 °C20 January 1958	17.7 °C	1,826 mm	69	2
1957	37.2 °C30 August 1957	-1.3 °C18 January 1957	17.5 °C	1,724 mm	56	1
1956	32.7 °C28 July 1956	-6.5 °C10 January 1956	16.7 °C	2,077 mm	58	10
1955	32.2 °C10 September 1955	-4.3 °C12 January 1955	16.9 °C	1,664 mm	47	16
1954	33.9 °C3 September 1954	-3.1 °C27 January 1954	17.0 °C	2,521 mm	50	8
1953	35.7 °C18 August 1953	-1.9 °C20 January 1953	17.8 °C	2,110 mm	69	2
1952	33.6 °C4 July 1952	-0.1 °C14 January 1952	17.5 °C	2,268 mm	53	1
1951	33.4 °C8 August 1951	-4.5 °C14 January 1951	17.1 °C	1,832 mm	65	5
1950	33.3 °C23 July 1950	-1.8 °C17 December 1950	16.9 °C	2,368 mm	28	2
1949	33.0 °C23 July 1949	-2.2 °C8 January 1949	17.4 °C	1,832 mm	61	2
1948	32.6 °C17 August 1948	-3.0 °C29 January 1948	17.4 °C	1,918 mm	60	8
1947	33.2 °C20 May 1947	-2.7 °C21 December 1947	17.5 °C	1,576 mm	55	7
1946	35.5 °C19 July 1946	-0.6 °C3 February 1946	17.6 °C	1,587 mm	71	3
1945	32.8 °C22 July 1945	-6.9 °C12 February 1945	16.2 °C	1,508 mm	35	17
1944	34.0 °C29 July 1944	-4.0 °C19 December 1944	16.8 °C	1,475 mm	79	9
1943	31.3 °C26 June 1943	-0.4 °C8 February 1943	17.0 °C	2,575 mm	15	2
1942	32.0 °C9 August 1942	-1.9 °C8 January 1942	17.4 °C	1,610 mm	47	5
1941	33.3 °C12 July 1941	0.2 °C4 February 1941	17.1 °C	1,724 mm	39	0
1940	34.6 °C19 August 1940	-4.3 °C24 January 1940	17.0 °C	1,473 mm	66	8

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

22.6 °C

+1.7 °C

Hot days (≥ 30 °C)

102 d/yr

+36

Frost days (< 0 °C)

0 d/yr

-3

Annual rainfall

1663 mm

-122 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	11.5 °C	+2.0 °C	63 mm	+12 mm
Feb	11.2 °C	-0.3 °C	41 mm	-23 mm
Mar	16.8 °C	+0.3 °C	162 mm	+34 mm
Apr	24.6 °C	+3.0 °C	140 mm	-40 mm
May	27.8 °C	+2.6 °C	93 mm	-127 mm
Jun	28.9 °C	+0.9 °C	230 mm	+18 mm
Jul	34.5 °C	+3.2 °C	105 mm	-121 mm
Aug	33.7 °C	+2.0 °C	220 mm	+45 mm
Sep	28.9 °C	+1.9 °C	199 mm	+9 mm
Oct	23.4 °C	+2.3 °C	256 mm	+94 mm
Nov	16.5 °C	+0.5 °C	84 mm	-30 mm
Dec	13.1 °C	+2.2 °C	71 mm	+8 mm

The year's extremes

Hottest day

38.5 °C

16 Jul 2025

Coldest day

0.3 °C

27 Jan 2025

Wettest day

114.8 mm

11 Aug 2025

Windiest day

21.2 km/h

28 Mar 2025

Strongest gust

50.0 km/h

28 Mar 2025

Hottest feels-like

45.2 °C

5 Aug 2025

Coldest feels-like

-3.2 °C

27 Jan 2025

Sunniest day

13.7 h

4 Jul 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 Helin?

Helin has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 17.5 °C and it receives 1,784 mm of precipitation per year.

What is the hottest day ever recorded in Helin?

The hottest day measured in Helin between 1940 and 2025 was 18 August 2022, reaching 40.6 °C.

What is the coldest day in Helin?

The coldest day measured in Helin between 1940 and 2025 was 12 February 1945, at -6.9 °C.

Does it snow in Helin?

Yes. Helin gets on average 4.5 cm of snow per year and has around 3 frost days.

Has the climate of Helin warmed?

Yes: Helin warmed by +0.9 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Helin?

The wettest day measured in Helin between 1940 and 2025 was 17 July 1982, with 188 mm of rain in 24 hours.

What was the windiest day in Helin?

The windiest day measured in Helin between 1940 and 2025 was 23 May 1946, with winds reaching 43.3 km/h.

What is the warmest month in Helin?

The warmest month in Helin is August (27.5 °C on average); the coldest is January (6.9 °C).

How much does it rain in Helin?

Helin receives on average 1,784 mm of precipitation per year, spread over about 177 rainy days.

Is it sunny in Helin?

Helin gets on average 6.0 hours of sunshine per day, roughly 2,190 hours per year over 1940-2025.

What is the biggest single-day snowfall in Helin?

The heaviest 24-hour snowfall measured in Helin between 1940 and 2025 was 22 February 1966, with 9.7 cm.

Are there tropical nights in Helin?

Yes: Helin has on average 107 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Helin?

In Helin, between 1940 and 2025, the highest apparent temperature reached 46.6 °C on 25 July 1957, and the lowest was -10.8 °C on 12 February 1945.

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