Rui’an climate — normals and trends

Q: What is the climate of Rui’an?

Rui’an has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 18.5 °C and it receives 1,612 mm of precipitation per year.

Q: What is the hottest day ever recorded in Rui’an?

The hottest day measured in Rui’an between 1940 and 2025 was 21 August 2022, reaching 34.9 °C.

Q: What is the coldest day in Rui’an?

The coldest day measured in Rui’an between 1940 and 2025 was 16 January 1970, at -5.2 °C.

Q: Does it snow in Rui’an?

Yes. Rui’an gets on average 2.6 cm of snow per year and has around 1 frost days.

Q: Has the climate of Rui’an warmed?

Yes: Rui’an warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Rui’an?

The wettest day measured in Rui’an between 1940 and 2025 was 19 July 2005, with 217 mm of rain in 24 hours.

Q: What was the windiest day in Rui’an?

The windiest day measured in Rui’an between 1940 and 2025 was 6 October 2013, with winds reaching 82.2 km/h.

Q: What is the warmest month in Rui’an?

The warmest month in Rui’an is July (27.8 °C on average); the coldest is January (8.9 °C).

Q: How much does it rain in Rui’an?

Rui’an receives on average 1,612 mm of precipitation per year, spread over about 161 rainy days.

Q: Is it sunny in Rui’an?

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

Rui’an (China) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 18.5 °C and it receives 1,612 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 (27.8 °C on average) and the coldest is January (8.9 °C). Rainfall peaks in June.

Rui’an averages 1 frost days, 30 hot days (≥ 30 °C) and 161 rainy days per year.

Rui’an has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.

The number of frost days there went from about 2 to 0 per year over the period.

The hottest day of the period reached 34.9 °C (on 21 August 2022) and the coldest -5.2 °C (on 16 January 1970).

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

Rui’anZhejiang

coords: 27.78°, 120.66°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJulyColdest monthJanuaryWettest monthJuneDriest monthDecember

Mean daily temperature

18.5°C

Average daily high

20.6°C

Average daily low

16.6°C

Annual rainfall

1,612mm

Sunshine / day

7.8h

Mean relative humidity

81%

Average peak wind

18.3km/h

Seasonal range

18.9°C

Frost days (< 0 °C)

1 d/yr

Hot days (≥ 30 °C)

30 d/yr

Rainy days (≥ 1 mm)

161 d/yr

Annual snowfall

2.6 cm

Average feels-like high

21.9 °C

Average feels-like low

16.6 °C

Average peak gust

31.7 km/h

Tropical nights (≥ 20 °C)

143 d/yr

Solar radiation

14.5 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.8 °C

since 1940

+0.2 °C per decade · r² = 0.65 · 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

34.9 °C

21 August 2022

Coldest day

-5.2 °C

16 January 1970

Wettest day

217 mm

19 July 2005

Windiest day

82.2 km/h

6 October 2013

Strongest gust

172.4 km/h

6 October 2013

Hottest feels-like

43.3 °C

6 August 2017

Coldest feels-like

-10.5 °C

16 January 1970

Snowiest day

11.7 cm

14 January 1989

Sunniest day

13.8 h

20 June 1943

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	33.8 °C30 July 2025	2.1 °C8 February 2025	20.2 °C	1,725 mm	96	0
2024	34.0 °C2 August 2024	0.1 °C23 January 2024	19.8 °C	2,384 mm	78	0
2023	33.9 °C5 August 2023	-0.2 °C25 January 2023	19.9 °C	1,359 mm	70	1
2022	34.9 °C21 August 2022	2.3 °C19 December 2022	19.6 °C	1,582 mm	75	0
2021	32.6 °C8 August 2021	0.0 °C9 January 2021	20.1 °C	1,823 mm	70	0
2020	34.2 °C25 August 2020	0.1 °C31 December 2020	19.9 °C	1,167 mm	66	0
2019	32.6 °C11 August 2019	4.2 °C27 January 2019	19.5 °C	1,691 mm	53	0
2018	33.8 °C16 August 2018	1.0 °C6 February 2018	19.7 °C	1,331 mm	52	0
2017	33.7 °C6 August 2017	3.1 °C21 January 2017	19.6 °C	1,354 mm	66	0
2016	32.4 °C15 July 2016	-2.4 °C25 January 2016	19.6 °C	1,753 mm	61	2
2015	31.8 °C28 June 2015	3.2 °C10 February 2015	19.2 °C	1,752 mm	28	0
2014	33.0 °C31 July 2014	1.9 °C11 February 2014	19.2 °C	1,678 mm	47	0
2013	33.8 °C8 August 2013	1.0 °C28 December 2013	19.1 °C	1,569 mm	51	0
2012	32.2 °C11 July 2012	1.2 °C31 December 2012	18.8 °C	1,856 mm	45	0
2011	32.9 °C6 August 2011	0.6 °C16 January 2011	18.6 °C	1,336 mm	34	0
2010	32.8 °C3 August 2010	1.1 °C16 December 2010	18.8 °C	1,986 mm	44	0
2009	33.1 °C28 August 2009	1.4 °C24 January 2009	19.3 °C	1,553 mm	45	0
2008	32.9 °C13 August 2008	2.4 °C14 February 2008	19.2 °C	1,568 mm	37	0
2007	32.9 °C13 July 2007	3.1 °C3 February 2007	19.4 °C	1,503 mm	51	0
2006	33.2 °C29 August 2006	0.6 °C7 January 2006	19.4 °C	1,877 mm	50	0
2005	32.3 °C1 August 2005	-0.3 °C1 January 2005	18.6 °C	1,832 mm	31	1
2004	32.6 °C18 August 2004	-0.1 °C25 January 2004	19.0 °C	1,461 mm	47	1
2003	32.7 °C30 July 2003	1.7 °C5 January 2003	18.8 °C	1,130 mm	61	0
2002	32.4 °C15 July 2002	2.9 °C27 December 2002	19.3 °C	1,546 mm	33	0
2001	31.2 °C10 July 2001	2.1 °C26 December 2001	19.0 °C	1,709 mm	38	0
2000	32.6 °C10 August 2000	0.1 °C27 January 2000	18.8 °C	1,841 mm	29	0
1999	31.9 °C9 August 1999	-0.3 °C23 December 1999	18.9 °C	1,702 mm	29	1
1998	32.8 °C16 July 1998	0.1 °C25 January 1998	19.2 °C	1,857 mm	41	0
1997	31.7 °C7 August 1997	1.8 °C8 January 1997	18.7 °C	1,810 mm	22	0
1996	31.5 °C13 August 1996	2.3 °C3 February 1996	18.3 °C	1,386 mm	30	0
1995	32.3 °C7 September 1995	2.3 °C5 February 1995	18.2 °C	1,403 mm	29	0
1994	32.1 °C13 August 1994	1.2 °C22 January 1994	19.2 °C	2,093 mm	36	0
1993	31.6 °C16 July 1993	-0.6 °C17 January 1993	18.4 °C	1,566 mm	30	1
1992	32.0 °C12 August 1992	0.5 °C15 January 1992	18.0 °C	2,029 mm	21	0
1991	31.9 °C22 August 1991	-1.1 °C29 December 1991	18.6 °C	1,211 mm	41	2
1990	31.8 °C7 August 1990	0.3 °C1 February 1990	18.7 °C	2,097 mm	28	0
1989	32.0 °C13 August 1989	-1.0 °C15 January 1989	18.3 °C	1,868 mm	28	1
1988	32.6 °C22 July 1988	2.6 °C18 February 1988	18.2 °C	1,760 mm	43	0
1987	32.2 °C30 August 1987	0.7 °C4 February 1987	18.1 °C	1,592 mm	25	0
1986	32.0 °C27 August 1986	0.5 °C6 January 1986	18.0 °C	1,212 mm	33	0
1985	31.7 °C17 August 1985	0.9 °C12 December 1985	18.1 °C	1,588 mm	15	0
1984	31.8 °C13 July 1984	-1.2 °C1 January 1984	17.7 °C	1,698 mm	21	5
1983	31.8 °C15 August 1983	-2.7 °C31 December 1983	18.2 °C	1,544 mm	27	2
1982	31.4 °C17 July 1982	1.2 °C19 January 1982	18.3 °C	1,878 mm	17	0
1981	32.0 °C2 September 1981	0.7 °C3 January 1981	17.9 °C	1,639 mm	18	0
1980	32.8 °C27 July 1980	-1.9 °C31 January 1980	18.1 °C	1,548 mm	33	4
1979	32.1 °C13 July 1979	0.2 °C1 February 1979	18.4 °C	1,255 mm	23	0
1978	33.0 °C1 August 1978	0.5 °C18 February 1978	18.4 °C	1,530 mm	34	0
1977	32.0 °C8 July 1977	-2.4 °C30 January 1977	18.4 °C	1,752 mm	16	5
1976	32.5 °C9 August 1976	-0.4 °C28 December 1976	17.7 °C	1,740 mm	12	1
1975	31.4 °C6 July 1975	-0.5 °C16 December 1975	18.6 °C	2,076 mm	33	1
1974	32.8 °C18 August 1974	-1.2 °C26 February 1974	18.1 °C	1,709 mm	17	1
1973	32.2 °C16 August 1973	-1.2 °C26 December 1973	18.4 °C	2,302 mm	12	2
1972	31.0 °C24 July 1972	-0.6 °C10 February 1972	18.2 °C	1,811 mm	7	1
1971	32.2 °C16 August 1971	0.7 °C5 January 1971	18.2 °C	1,404 mm	36	0
1970	31.7 °C13 August 1970	-5.2 °C16 January 1970	17.9 °C	1,700 mm	16	6
1969	31.1 °C23 August 1969	-1.4 °C5 February 1969	17.5 °C	1,674 mm	11	2
1968	33.5 °C14 August 1968	1.6 °C12 February 1968	18.2 °C	1,671 mm	10	0
1967	31.7 °C16 July 1967	-3.1 °C16 January 1967	18.0 °C	1,266 mm	35	6
1966	32.0 °C14 August 1966	-1.1 °C27 December 1966	18.4 °C	1,675 mm	14	1
1965	31.0 °C21 July 1965	-0.9 °C17 December 1965	17.9 °C	1,942 mm	8	1
1964	32.3 °C19 August 1964	1.9 °C25 January 1964	18.5 °C	1,761 mm	33	0
1963	32.4 °C31 August 1963	-1.4 °C8 January 1963	18.4 °C	1,155 mm	19	2
1962	32.0 °C2 August 1962	0.1 °C2 January 1962	18.0 °C	2,449 mm	25	0
1961	31.3 °C25 July 1961	0.5 °C12 January 1961	18.5 °C	1,890 mm	10	0
1960	32.9 °C27 July 1960	1.4 °C31 December 1960	18.6 °C	1,908 mm	25	0
1959	32.1 °C12 July 1959	-0.3 °C17 January 1959	18.5 °C	1,821 mm	24	1
1958	31.1 °C31 July 1958	-0.2 °C24 January 1958	18.0 °C	1,862 mm	10	1
1957	32.1 °C20 August 1957	-1.6 °C11 February 1957	17.9 °C	1,213 mm	18	3
1956	32.5 °C9 July 1956	-0.5 °C9 January 1956	18.0 °C	1,579 mm	31	1
1955	31.1 °C13 July 1955	-1.9 °C11 January 1955	18.0 °C	1,506 mm	7	3
1954	34.1 °C16 August 1954	1.2 °C26 January 1954	18.3 °C	870 mm	27	0
1953	32.3 °C4 August 1953	1.8 °C18 January 1953	18.5 °C	1,264 mm	44	0
1952	31.0 °C16 August 1952	-1.0 °C19 February 1952	18.3 °C	1,929 mm	8	2
1951	32.7 °C21 August 1951	-1.7 °C14 January 1951	18.0 °C	1,744 mm	9	2
1950	32.0 °C19 July 1950	2.0 °C18 February 1950	18.4 °C	1,446 mm	13	0
1949	31.4 °C29 July 1949	-0.1 °C9 January 1949	18.3 °C	1,515 mm	8	1
1948	30.9 °C6 July 1948	0.1 °C27 January 1948	18.4 °C	1,572 mm	6	0
1947	31.5 °C31 July 1947	-0.1 °C20 December 1947	17.7 °C	1,602 mm	19	1
1946	31.2 °C17 September 1946	0.9 °C5 January 1946	18.3 °C	776 mm	10	0
1945	31.8 °C3 August 1945	0.3 °C18 December 1945	17.5 °C	1,172 mm	11	0
1944	31.2 °C3 August 1944	0.8 °C9 December 1944	17.8 °C	1,058 mm	10	0
1943	30.1 °C1 August 1943	-1.7 °C12 January 1943	18.1 °C	1,191 mm	3	2
1942	30.7 °C9 August 1942	0.2 °C18 January 1942	17.6 °C	1,098 mm	4	0
1941	29.9 °C7 August 1941	0.6 °C25 January 1941	17.9 °C	1,432 mm	0	0
1940	30.9 °C31 July 1940	-1.0 °C24 January 1940	17.3 °C	1,466 mm	6	4

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

22.7 °C

+2.1 °C

Hot days (≥ 30 °C)

96 d/yr

+66

Frost days (< 0 °C)

0 d/yr

-1

Annual rainfall

1725 mm

+113 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	13.1 °C	+1.8 °C	8 mm	-50 mm
Feb	11.9 °C	+0.3 °C	52 mm	-26 mm
Mar	15.8 °C	+1.7 °C	121 mm	+5 mm
Apr	21.0 °C	+2.7 °C	146 mm	+7 mm
May	24.8 °C	+2.2 °C	278 mm	+63 mm
Jun	29.1 °C	+2.7 °C	123 mm	-148 mm
Jul	30.4 °C	+0.8 °C	578 mm	+435 mm
Aug	31.5 °C	+1.8 °C	46 mm	-152 mm
Sep	31.0 °C	+3.5 °C	185 mm	+7 mm
Oct	27.0 °C	+3.7 °C	86 mm	-2 mm
Nov	19.4 °C	+0.6 °C	89 mm	+15 mm
Dec	16.4 °C	+2.6 °C	13 mm	-41 mm

The year's extremes

Hottest day

33.8 °C

30 Jul 2025

Coldest day

2.1 °C

8 Feb 2025

Wettest day

140.6 mm

8 Jul 2025

Windiest day

41.8 km/h

9 Jul 2025

Strongest gust

72.7 km/h

9 Jul 2025

Hottest feels-like

40.6 °C

15 Jul 2025

Coldest feels-like

-4.7 °C

8 Feb 2025

Sunniest day

13.6 h

28 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 Rui’an?

Rui’an has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 18.5 °C and it receives 1,612 mm of precipitation per year.

What is the hottest day ever recorded in Rui’an?

The hottest day measured in Rui’an between 1940 and 2025 was 21 August 2022, reaching 34.9 °C.

What is the coldest day in Rui’an?

The coldest day measured in Rui’an between 1940 and 2025 was 16 January 1970, at -5.2 °C.

Does it snow in Rui’an?

Yes. Rui’an gets on average 2.6 cm of snow per year and has around 1 frost days.

Has the climate of Rui’an warmed?

Yes: Rui’an warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Rui’an?

The wettest day measured in Rui’an between 1940 and 2025 was 19 July 2005, with 217 mm of rain in 24 hours.

What was the windiest day in Rui’an?

The windiest day measured in Rui’an between 1940 and 2025 was 6 October 2013, with winds reaching 82.2 km/h.

What is the warmest month in Rui’an?

The warmest month in Rui’an is July (27.8 °C on average); the coldest is January (8.9 °C).

How much does it rain in Rui’an?

Rui’an receives on average 1,612 mm of precipitation per year, spread over about 161 rainy days.

Is it sunny in Rui’an?

Rui’an 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 Rui’an?

The heaviest 24-hour snowfall measured in Rui’an between 1940 and 2025 was 14 January 1989, with 11.7 cm.

Are there tropical nights in Rui’an?

Yes: Rui’an has on average 143 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Rui’an?

In Rui’an, between 1940 and 2025, the highest apparent temperature reached 43.3 °C on 6 August 2017, and the lowest was -10.5 °C on 16 January 1970.

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