Caotun climate — normals and trends

Q: What is the climate of Caotun?

Caotun has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 21.7 °C and it receives 1,784 mm of precipitation per year.

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

The hottest day measured in Caotun between 1940 and 2025 was 1 July 2004, reaching 35.4 °C.

Q: What is the coldest day in Caotun?

The coldest day measured in Caotun between 1940 and 2025 was 1 February 1970, at 1.5 °C.

Q: Does it snow in Caotun?

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

Q: Has the climate of Caotun warmed?

Yes: Caotun warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Caotun?

The wettest day measured in Caotun between 1940 and 2025 was 11 September 1963, with 525 mm of rain in 24 hours.

Q: What was the windiest day in Caotun?

The windiest day measured in Caotun between 1940 and 2025 was 26 September 1969, with winds reaching 46.2 km/h.

Q: What is the warmest month in Caotun?

The warmest month in Caotun is July (26.2 °C on average); the coldest is January (15.5 °C).

Q: How much does it rain in Caotun?

Caotun receives on average 1,784 mm of precipitation per year, spread over about 186 rainy days.

Q: Is it sunny in Caotun?

Caotun gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.

Caotun (Taiwan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 21.7 °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 July (26.2 °C on average) and the coldest is January (15.5 °C). Rainfall peaks in August.

Caotun averages 0 frost days, 54 hot days (≥ 30 °C) and 186 rainy days per year.

Caotun has warmed by +2.2 °C between 1940 and 2025, or +0.26 °C per decade. This trend is statistically significant.

The hottest day of the period reached 35.4 °C (on 1 July 2004) and the coldest 1.5 °C (on 1 February 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

CaotunTaiwan

coords: 23.98°, 120.69°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJulyColdest monthJanuaryWettest monthAugustDriest monthNovember

Mean daily temperature

21.7°C

Average daily high

25.6°C

Average daily low

18.3°C

Annual rainfall

1,784mm

Sunshine / day

9.8h

Mean relative humidity

80%

Average peak wind

9.7km/h

Seasonal range

10.7°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

54 d/yr

Rainy days (≥ 1 mm)

186 d/yr

Annual snowfall

0.0 cm

Average feels-like high

28.9 °C

Average feels-like low

19.9 °C

Average peak gust

28.3 km/h

Tropical nights (≥ 20 °C)

162 d/yr

Solar radiation

16.4 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.2 °C

since 1940

+0.3 °C per decade · r² = 0.79 · 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

35.4 °C

1 July 2004

Coldest day

1.5 °C

1 February 1970

Wettest day

525 mm

11 September 1963

Windiest day

46.2 km/h

26 September 1969

Strongest gust

137.9 km/h

27 September 1969

Hottest feels-like

42.0 °C

2 August 2009

Coldest feels-like

-1.7 °C

1 February 1963

Sunniest day

13.5 h

14 June 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	33.2 °C22 September 2025	7.6 °C28 January 2025	22.8 °C	1,990 mm	116
2024	33.6 °C4 July 2024	8.2 °C24 January 2024	23.2 °C	1,959 mm	116
2023	33.2 °C30 May 2023	7.6 °C29 January 2023	22.8 °C	1,779 mm	89
2022	33.5 °C27 August 2022	7.1 °C25 December 2022	22.4 °C	1,583 mm	91
2021	34.3 °C16 May 2021	7.3 °C10 January 2021	22.8 °C	1,512 mm	111
2020	34.6 °C12 July 2020	6.1 °C31 January 2020	23.2 °C	1,164 mm	129
2019	33.5 °C17 July 2019	9.8 °C28 January 2019	22.9 °C	1,693 mm	74
2018	33.7 °C28 May 2018	5.2 °C13 January 2018	22.7 °C	1,696 mm	88
2017	32.5 °C24 September 2017	10.0 °C12 February 2017	22.7 °C	1,727 mm	107
2016	32.4 °C27 June 2016	4.5 °C25 January 2016	22.4 °C	2,312 mm	84
2015	32.9 °C26 June 2015	6.3 °C23 January 2015	22.5 °C	1,653 mm	82
2014	35.0 °C15 September 2014	6.1 °C23 January 2014	22.4 °C	1,465 mm	96
2013	32.0 °C1 July 2013	9.0 °C28 December 2013	22.5 °C	2,199 mm	67
2012	32.3 °C21 July 2012	9.5 °C31 December 2012	22.4 °C	2,549 mm	57
2011	34.1 °C27 September 2011	7.9 °C17 January 2011	22.2 °C	1,659 mm	80
2010	32.2 °C3 July 2010	6.3 °C14 January 2010	22.4 °C	1,701 mm	74
2009	34.4 °C2 August 2009	5.6 °C14 January 2009	22.6 °C	1,856 mm	84
2008	33.1 °C28 May 2008	8.8 °C10 February 2008	22.6 °C	2,575 mm	92
2007	32.1 °C22 June 2007	4.7 °C29 January 2007	22.6 °C	2,147 mm	68
2006	32.4 °C6 July 2006	8.8 °C18 December 2006	22.7 °C	2,105 mm	64
2005	33.0 °C24 September 2005	4.8 °C6 March 2005	22.2 °C	2,337 mm	80
2004	35.4 °C1 July 2004	6.3 °C25 January 2004	22.2 °C	2,173 mm	83
2003	34.3 °C22 July 2003	9.3 °C6 January 2003	22.5 °C	1,222 mm	74
2002	32.4 °C5 July 2002	7.5 °C3 January 2002	22.6 °C	1,303 mm	67
2001	31.8 °C30 June 2001	7.5 °C26 December 2001	22.2 °C	2,422 mm	52
2000	32.1 °C6 July 2000	10.4 °C19 January 2000	22.2 °C	1,919 mm	39
1999	32.4 °C23 July 1999	5.2 °C22 December 1999	22.1 °C	1,440 mm	36
1998	32.3 °C31 July 1998	10.4 °C5 February 1998	22.7 °C	1,938 mm	72
1997	31.5 °C15 May 1997	6.6 °C12 January 1997	21.7 °C	1,733 mm	23
1996	32.8 °C21 July 1996	6.0 °C2 January 1996	21.8 °C	1,699 mm	64
1995	33.2 °C29 July 1995	6.7 °C6 February 1995	21.5 °C	1,446 mm	66
1994	31.8 °C13 July 1994	7.8 °C4 March 1994	22.2 °C	2,317 mm	43
1993	33.8 °C27 June 1993	5.2 °C31 January 1993	22.0 °C	1,356 mm	82
1992	31.5 °C21 July 1992	7.6 °C15 January 1992	21.4 °C	2,211 mm	26
1991	32.8 °C9 June 1991	7.5 °C29 December 1991	22.1 °C	1,333 mm	88
1990	32.5 °C26 August 1990	9.3 °C5 January 1990	22.0 °C	2,283 mm	49
1989	32.0 °C16 July 1989	7.7 °C9 March 1989	21.5 °C	1,974 mm	51
1988	31.8 °C29 June 1988	6.8 °C12 December 1988	21.7 °C	1,854 mm	65
1987	31.8 °C7 July 1987	5.7 °C5 February 1987	21.8 °C	1,565 mm	50
1986	32.8 °C11 August 1986	3.1 °C3 March 1986	21.4 °C	2,083 mm	57
1985	30.9 °C21 June 1985	4.3 °C17 December 1985	21.4 °C	1,975 mm	19
1984	32.1 °C24 June 1984	7.6 °C9 January 1984	21.2 °C	1,847 mm	21
1983	33.8 °C16 July 1983	8.3 °C25 January 1983	21.6 °C	1,678 mm	95
1982	31.8 °C28 July 1982	7.2 °C19 January 1982	21.5 °C	1,911 mm	39
1981	32.6 °C2 July 1981	4.9 °C12 January 1981	21.6 °C	2,466 mm	38
1980	35.0 °C10 July 1980	5.9 °C24 December 1980	21.9 °C	1,223 mm	84
1979	33.2 °C4 July 1979	8.3 °C2 February 1979	21.5 °C	1,921 mm	58
1978	33.7 °C25 August 1978	4.2 °C22 January 1978	21.7 °C	2,471 mm	58
1977	33.4 °C20 July 1977	5.0 °C18 February 1977	21.7 °C	1,938 mm	74
1976	32.0 °C23 August 1976	8.1 °C12 January 1976	21.3 °C	1,906 mm	37
1975	31.2 °C7 July 1975	6.4 °C30 December 1975	21.6 °C	1,991 mm	55
1974	32.0 °C8 August 1974	5.6 °C2 January 1974	21.6 °C	1,964 mm	37
1973	32.2 °C22 August 1973	3.4 °C25 December 1973	21.7 °C	1,739 mm	48
1972	31.4 °C7 July 1972	3.7 °C4 March 1972	21.2 °C	2,597 mm	29
1971	32.9 °C21 July 1971	3.8 °C10 January 1971	21.2 °C	1,694 mm	61
1970	32.2 °C8 August 1970	1.5 °C1 February 1970	21.4 °C	2,036 mm	59
1969	33.5 °C26 July 1969	7.4 °C6 February 1969	21.3 °C	2,083 mm	59
1968	32.7 °C6 September 1968	6.3 °C4 March 1968	20.9 °C	1,833 mm	39
1967	31.5 °C16 August 1967	2.9 °C17 January 1967	21.0 °C	1,651 mm	42
1966	30.2 °C15 August 1966	9.7 °C4 January 1966	21.2 °C	1,966 mm	1
1965	30.3 °C17 April 1965	4.2 °C9 January 1965	20.8 °C	1,375 mm	3
1964	33.9 °C7 August 1964	8.9 °C19 December 1964	21.5 °C	1,379 mm	28
1963	33.4 °C5 September 1963	2.2 °C1 February 1963	20.8 °C	1,925 mm	36
1962	32.0 °C1 June 1962	5.1 °C28 January 1962	20.8 °C	1,635 mm	31
1961	30.9 °C18 July 1961	5.7 °C18 January 1961	21.2 °C	1,806 mm	10
1960	31.6 °C22 August 1960	5.6 °C31 December 1960	21.6 °C	2,554 mm	34
1959	31.5 °C28 July 1959	3.0 °C18 January 1959	21.7 °C	1,587 mm	48
1958	32.4 °C9 September 1958	3.7 °C13 February 1958	21.5 °C	1,835 mm	54
1957	32.0 °C15 July 1957	6.4 °C19 January 1957	21.4 °C	1,435 mm	59
1956	33.5 °C7 July 1956	6.7 °C10 January 1956	21.4 °C	2,299 mm	79
1955	32.3 °C13 July 1955	4.1 °C22 February 1955	21.0 °C	1,422 mm	31
1954	33.0 °C23 June 1954	7.8 °C17 December 1954	22.1 °C	897 mm	124
1953	34.0 °C12 August 1953	5.8 °C8 January 1953	21.7 °C	1,654 mm	56
1952	31.5 °C8 July 1952	6.5 °C8 January 1952	21.4 °C	1,430 mm	23
1951	33.7 °C31 July 1951	6.3 °C16 December 1951	21.0 °C	1,538 mm	9
1950	31.0 °C19 July 1950	5.2 °C10 December 1950	20.7 °C	1,901 mm	4
1949	33.0 °C23 May 1949	4.8 °C17 January 1949	21.6 °C	1,133 mm	40
1948	30.6 °C31 May 1948	4.5 °C17 January 1948	20.9 °C	1,425 mm	7
1947	30.4 °C25 August 1947	8.2 °C24 February 1947	20.5 °C	1,948 mm	8
1946	31.7 °C6 September 1946	6.4 °C9 February 1946	21.2 °C	1,105 mm	30
1945	30.5 °C23 July 1945	7.7 °C18 January 1945	20.2 °C	1,501 mm	1
1944	30.8 °C7 April 1944	7.7 °C8 January 1944	20.8 °C	1,388 mm	2
1943	30.7 °C8 May 1943	6.1 °C13 January 1943	20.3 °C	701 mm	6
1942	29.6 °C11 August 1942	5.9 °C7 December 1942	20.5 °C	1,477 mm	0
1941	29.8 °C31 August 1941	4.4 °C5 February 1941	20.6 °C	1,643 mm	0
1940	28.9 °C27 July 1940	4.7 °C4 January 1940	20.0 °C	1,581 mm	0

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

26.6 °C

+1.0 °C

Hot days (≥ 30 °C)

116 d/yr

+62

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1990 mm

+206 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	19.8 °C	-0.1 °C	61 mm	+8 mm
Feb	20.4 °C	-0.3 °C	119 mm	+44 mm
Mar	23.7 °C	+0.8 °C	101 mm	+12 mm
Apr	26.0 °C	+0.4 °C	105 mm	+4 mm
May	29.0 °C	+1.2 °C	116 mm	-49 mm
Jun	30.1 °C	+1.2 °C	263 mm	+28 mm
Jul	29.5 °C	-0.3 °C	649 mm	+369 mm
Aug	30.4 °C	+1.2 °C	215 mm	-134 mm
Sep	30.6 °C	+1.8 °C	156 mm	-92 mm
Oct	29.7 °C	+2.4 °C	127 mm	+33 mm
Nov	26.4 °C	+1.5 °C	46 mm	+1 mm
Dec	23.5 °C	+1.9 °C	31 mm	-17 mm

The year's extremes

Hottest day

33.2 °C

22 Sep 2025

Coldest day

7.6 °C

28 Jan 2025

Wettest day

125.7 mm

20 Jul 2025

Windiest day

26.1 km/h

13 Aug 2025

Strongest gust

108.4 km/h

13 Aug 2025

Hottest feels-like

39.7 °C

24 Aug 2025

Coldest feels-like

4.8 °C

28 Jan 2025

Sunniest day

13.3 h

15 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 Caotun?

Caotun has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 21.7 °C and it receives 1,784 mm of precipitation per year.

What is the hottest day ever recorded in Caotun?

The hottest day measured in Caotun between 1940 and 2025 was 1 July 2004, reaching 35.4 °C.

What is the coldest day in Caotun?

The coldest day measured in Caotun between 1940 and 2025 was 1 February 1970, at 1.5 °C.

Does it snow in Caotun?

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

Has the climate of Caotun warmed?

Yes: Caotun warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Caotun?

The wettest day measured in Caotun between 1940 and 2025 was 11 September 1963, with 525 mm of rain in 24 hours.

What was the windiest day in Caotun?

The windiest day measured in Caotun between 1940 and 2025 was 26 September 1969, with winds reaching 46.2 km/h.

What is the warmest month in Caotun?

The warmest month in Caotun is July (26.2 °C on average); the coldest is January (15.5 °C).

How much does it rain in Caotun?

Caotun receives on average 1,784 mm of precipitation per year, spread over about 186 rainy days.

Is it sunny in Caotun?

Caotun gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.

Are there tropical nights in Caotun?

Yes: Caotun has on average 162 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Caotun?

In Caotun, between 1940 and 2025, the highest apparent temperature reached 42.0 °C on 2 August 2009, and the lowest was -1.7 °C on 1 February 1963.

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