Yilan climate — normals and trends

Q: What is the climate of Yilan?

Yilan has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 20.5 °C and it receives 3,198 mm of precipitation per year.

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

The hottest day measured in Yilan between 1940 and 2025 was 10 August 2019, reaching 34.9 °C.

Q: What is the coldest day in Yilan?

The coldest day measured in Yilan between 1940 and 2025 was 24 January 2016, at 1.9 °C.

Q: Does it snow in Yilan?

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

Q: Has the climate of Yilan warmed?

Yes: Yilan warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Yilan?

The wettest day measured in Yilan between 1940 and 2025 was 2 October 1970, with 353 mm of rain in 24 hours.

Q: What was the windiest day in Yilan?

The windiest day measured in Yilan between 1940 and 2025 was 8 August 2015, with winds reaching 68.0 km/h.

Q: What is the warmest month in Yilan?

The warmest month in Yilan is July (26.7 °C on average); the coldest is January (13.8 °C).

Q: How much does it rain in Yilan?

Yilan receives on average 3,198 mm of precipitation per year, spread over about 270 rainy days.

Q: Is it sunny in Yilan?

Yilan gets on average 8.0 hours of sunshine per day, roughly 2,920 hours per year over 1940-2025.

Yilan (Taiwan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 20.5 °C and it receives 3,198 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 (26.7 °C on average) and the coldest is January (13.8 °C). Rainfall peaks in October.

Yilan averages 0 frost days, 25 hot days (≥ 30 °C) and 270 rainy days per year.

Yilan has warmed by +2.0 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.

The hottest day of the period reached 34.9 °C (on 10 August 2019) and the coldest 1.9 °C (on 24 January 2016).

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

YilanTaiwan

coords: 24.76°, 121.75°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJulyColdest monthJanuaryWettest monthOctoberDriest monthMarch

Mean daily temperature

20.5°C

Average daily high

22.7°C

Average daily low

18.5°C

Annual rainfall

3,198mm

Sunshine / day

8.0h

Mean relative humidity

85%

Average peak wind

11.2km/h

Seasonal range

12.9°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

25 d/yr

Rainy days (≥ 1 mm)

270 d/yr

Annual snowfall

0.9 cm

Average feels-like high

25.6 °C

Average feels-like low

20.0 °C

Average peak gust

30.6 km/h

Tropical nights (≥ 20 °C)

165 d/yr

Solar radiation

14.1 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.0 °C

since 1940

+0.2 °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

34.9 °C

10 August 2019

Coldest day

1.9 °C

24 January 2016

Wettest day

353 mm

2 October 1970

Windiest day

68.0 km/h

8 August 2015

Strongest gust

205.9 km/h

8 August 2015

Hottest feels-like

42.8 °C

16 July 1998

Coldest feels-like

-3.5 °C

24 January 2016

Snowiest day

2.1 cm

24 January 2016

Sunniest day

13.5 h

2 July 2001

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	32.0 °C20 August 2025	7.2 °C28 January 2025	21.6 °C	3,643 mm	68
2024	32.4 °C3 August 2024	5.9 °C23 January 2024	21.7 °C	3,793 mm	64
2023	34.6 °C6 August 2023	5.7 °C25 January 2023	21.4 °C	3,125 mm	31
2022	32.9 °C16 July 2022	7.0 °C18 December 2022	21.2 °C	4,163 mm	50
2021	33.1 °C18 June 2021	5.3 °C8 January 2021	21.6 °C	3,028 mm	57
2020	34.4 °C25 August 2020	6.0 °C31 December 2020	21.6 °C	2,827 mm	60
2019	34.9 °C10 August 2019	10.2 °C8 March 2019	21.7 °C	3,024 mm	56
2018	31.9 °C30 July 2018	6.3 °C5 February 2018	21.3 °C	3,069 mm	34
2017	34.3 °C6 August 2017	7.9 °C10 February 2017	21.4 °C	2,932 mm	66
2016	32.8 °C15 July 2016	1.9 °C24 January 2016	21.5 °C	3,728 mm	54
2015	31.8 °C27 June 2015	7.5 °C9 February 2015	21.3 °C	3,586 mm	35
2014	33.5 °C1 August 2014	6.7 °C11 February 2014	21.1 °C	2,585 mm	57
2013	32.8 °C19 August 2013	8.6 °C18 January 2013	21.3 °C	3,200 mm	41
2012	32.6 °C8 August 2012	7.0 °C30 December 2012	21.1 °C	3,369 mm	34
2011	32.1 °C7 August 2011	6.0 °C16 January 2011	20.6 °C	3,253 mm	36
2010	33.0 °C4 July 2010	7.0 °C13 January 2010	21.2 °C	2,845 mm	42
2009	31.5 °C20 August 2009	6.6 °C14 January 2009	21.2 °C	3,388 mm	33
2008	32.5 °C13 August 2008	7.1 °C13 February 2008	21.2 °C	3,951 mm	40
2007	33.6 °C19 July 2007	7.9 °C29 January 2007	21.5 °C	4,207 mm	42
2006	33.5 °C30 August 2006	7.0 °C7 January 2006	21.5 °C	3,301 mm	43
2005	32.5 °C1 August 2005	5.4 °C1 January 2005	21.1 °C	3,937 mm	40
2004	32.2 °C6 July 2004	5.3 °C24 January 2004	20.9 °C	3,074 mm	30
2003	33.7 °C8 August 2003	7.8 °C28 January 2003	21.0 °C	1,999 mm	22
2002	31.8 °C24 June 2002	8.7 °C3 January 2002	21.3 °C	2,440 mm	23
2001	31.1 °C6 August 2001	8.4 °C22 December 2001	21.0 °C	3,462 mm	25
2000	32.7 °C26 July 2000	7.1 °C26 January 2000	20.9 °C	4,212 mm	26
1999	31.1 °C16 August 1999	5.1 °C22 December 1999	20.8 °C	2,845 mm	10
1998	33.8 °C16 July 1998	7.2 °C25 January 1998	21.6 °C	4,333 mm	40
1997	30.9 °C6 August 1997	8.0 °C12 January 1997	20.7 °C	3,088 mm	5
1996	31.1 °C20 June 1996	6.7 °C10 February 1996	20.4 °C	3,261 mm	18
1995	33.0 °C22 June 1995	6.7 °C6 February 1995	20.3 °C	2,631 mm	31
1994	32.6 °C13 August 1994	7.3 °C21 January 1994	21.2 °C	3,332 mm	34
1993	31.7 °C17 July 1993	6.8 °C29 January 1993	20.8 °C	2,447 mm	36
1992	30.9 °C24 August 1992	6.9 °C1 February 1992	20.4 °C	3,231 mm	15
1991	32.3 °C28 July 1991	4.5 °C28 December 1991	20.9 °C	2,862 mm	33
1990	32.6 °C6 August 1990	8.4 °C1 February 1990	20.9 °C	3,846 mm	31
1989	31.6 °C16 June 1989	6.9 °C28 January 1989	20.5 °C	3,186 mm	33
1988	32.1 °C12 June 1988	8.3 °C18 February 1988	20.6 °C	3,660 mm	52
1987	31.8 °C4 August 1987	5.5 °C27 February 1987	20.8 °C	3,466 mm	36
1986	32.8 °C27 August 1986	3.8 °C3 March 1986	20.2 °C	3,592 mm	26
1985	31.1 °C31 July 1985	5.3 °C16 December 1985	20.3 °C	3,248 mm	7
1984	33.3 °C13 July 1984	5.9 °C7 February 1984	20.2 °C	2,916 mm	21
1983	32.4 °C1 July 1983	7.6 °C22 January 1983	20.7 °C	3,196 mm	37
1982	31.5 °C17 June 1982	7.2 °C17 January 1982	20.5 °C	3,061 mm	28
1981	32.9 °C21 August 1981	5.9 °C27 February 1981	20.4 °C	3,429 mm	31
1980	32.3 °C2 August 1980	5.7 °C31 January 1980	20.4 °C	3,317 mm	37
1979	32.8 °C13 July 1979	5.7 °C1 February 1979	20.3 °C	3,174 mm	28
1978	31.9 °C30 June 1978	4.2 °C18 February 1978	20.4 °C	3,823 mm	34
1977	32.0 °C9 July 1977	4.8 °C18 February 1977	20.7 °C	3,639 mm	31
1976	31.5 °C18 July 1976	7.0 °C9 December 1976	20.0 °C	2,955 mm	15
1975	31.3 °C28 July 1975	6.4 °C29 December 1975	20.5 °C	3,253 mm	20
1974	32.1 °C23 July 1974	4.2 °C26 February 1974	20.3 °C	4,748 mm	21
1973	31.6 °C23 June 1973	4.5 °C24 December 1973	20.6 °C	3,214 mm	22
1972	33.3 °C21 July 1972	4.5 °C2 March 1972	20.1 °C	3,702 mm	8
1971	32.8 °C3 August 1971	6.1 °C5 January 1971	20.0 °C	3,451 mm	16
1970	32.4 °C4 July 1970	5.0 °C16 January 1970	20.2 °C	3,587 mm	26
1969	31.4 °C23 August 1969	4.4 °C6 February 1969	20.1 °C	3,606 mm	24
1968	31.7 °C31 July 1968	5.7 °C21 February 1968	19.8 °C	3,322 mm	13
1967	32.0 °C16 July 1967	2.9 °C16 January 1967	19.9 °C	3,300 mm	20
1966	30.1 °C2 August 1966	8.5 °C23 February 1966	20.0 °C	3,171 mm	2
1965	29.9 °C4 August 1965	7.4 °C11 January 1965	19.5 °C	3,029 mm	0
1964	29.8 °C5 July 1964	6.7 °C2 February 1964	20.1 °C	2,620 mm	0
1963	29.4 °C31 August 1963	5.0 °C7 January 1963	19.6 °C	2,493 mm	0
1962	29.7 °C25 June 1962	5.9 °C2 January 1962	19.6 °C	2,800 mm	0
1961	30.1 °C2 August 1961	5.1 °C1 February 1961	20.2 °C	2,487 mm	3
1960	31.2 °C27 July 1960	5.3 °C30 December 1960	20.4 °C	3,083 mm	11
1959	31.6 °C12 July 1959	4.8 °C17 January 1959	20.6 °C	3,153 mm	34
1958	30.8 °C8 July 1958	4.0 °C13 February 1958	20.3 °C	3,091 mm	16
1957	31.2 °C20 August 1957	5.4 °C11 February 1957	20.2 °C	3,196 mm	28
1956	31.9 °C17 July 1956	4.4 °C9 January 1956	20.2 °C	3,118 mm	26
1955	32.3 °C13 July 1955	4.4 °C20 February 1955	19.9 °C	2,641 mm	8
1954	33.1 °C17 August 1954	7.5 °C5 February 1954	20.5 °C	2,716 mm	23
1953	31.5 °C12 July 1953	7.0 °C6 January 1953	20.5 °C	3,231 mm	28
1952	30.3 °C4 July 1952	5.5 °C8 January 1952	20.5 °C	2,723 mm	6
1951	31.9 °C19 August 1951	6.7 °C21 January 1951	20.0 °C	3,150 mm	7
1950	33.5 °C19 July 1950	6.0 °C10 December 1950	20.0 °C	2,839 mm	4
1949	30.5 °C24 July 1949	5.2 °C16 January 1949	20.2 °C	2,644 mm	5
1948	30.2 °C31 July 1948	5.1 °C26 January 1948	19.9 °C	2,441 mm	5
1947	30.5 °C31 July 1947	5.9 °C21 February 1947	19.4 °C	3,610 mm	2
1946	29.5 °C5 July 1946	5.9 °C2 February 1946	19.7 °C	2,514 mm	0
1945	30.5 °C2 August 1945	6.2 °C18 December 1945	19.1 °C	3,272 mm	2
1944	28.6 °C21 July 1944	8.0 °C6 January 1944	19.4 °C	2,902 mm	0
1943	28.9 °C31 July 1943	4.4 °C12 January 1943	19.4 °C	2,252 mm	0
1942	30.9 °C10 August 1942	6.8 °C13 February 1942	19.5 °C	3,292 mm	4
1941	28.9 °C11 July 1941	6.3 °C2 February 1941	19.5 °C	3,071 mm	0
1940	30.0 °C13 July 1940	5.1 °C24 January 1940	18.8 °C	2,661 mm	1

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

24.0 °C

+1.3 °C

Hot days (≥ 30 °C)

68 d/yr

+43

Frost days (< 0 °C)

0 d/yr

Annual rainfall

3643 mm

+445 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	16.0 °C	+0.1 °C	122 mm	-63 mm
Feb	16.3 °C	-0.1 °C	231 mm	+63 mm
Mar	19.8 °C	+1.1 °C	238 mm	+92 mm
Apr	22.7 °C	+0.8 °C	138 mm	-32 mm
May	25.8 °C	+0.8 °C	309 mm	+11 mm
Jun	29.5 °C	+1.9 °C	252 mm	-100 mm
Jul	29.1 °C	-0.1 °C	413 mm	+158 mm
Aug	30.3 °C	+1.4 °C	177 mm	-123 mm
Sep	29.4 °C	+2.2 °C	172 mm	-179 mm
Oct	26.6 °C	+2.8 °C	745 mm	+334 mm
Nov	22.2 °C	+1.4 °C	495 mm	+166 mm
Dec	19.3 °C	+1.8 °C	351 mm	+117 mm

The year's extremes

Hottest day

32.0 °C

20 Aug 2025

Coldest day

7.2 °C

28 Jan 2025

Wettest day

176.8 mm

11 Nov 2025

Windiest day

30.0 km/h

13 Aug 2025

Strongest gust

105.8 km/h

13 Aug 2025

Hottest feels-like

39.5 °C

20 Aug 2025

Coldest feels-like

3.4 °C

8 Feb 2025

Snowiest day

0.1 cm

4 Feb 2025

Sunniest day

13.4 h

30 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 Yilan?

Yilan has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 20.5 °C and it receives 3,198 mm of precipitation per year.

What is the hottest day ever recorded in Yilan?

The hottest day measured in Yilan between 1940 and 2025 was 10 August 2019, reaching 34.9 °C.

What is the coldest day in Yilan?

The coldest day measured in Yilan between 1940 and 2025 was 24 January 2016, at 1.9 °C.

Does it snow in Yilan?

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

Has the climate of Yilan warmed?

Yes: Yilan warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Yilan?

The wettest day measured in Yilan between 1940 and 2025 was 2 October 1970, with 353 mm of rain in 24 hours.

What was the windiest day in Yilan?

The windiest day measured in Yilan between 1940 and 2025 was 8 August 2015, with winds reaching 68.0 km/h.

What is the warmest month in Yilan?

The warmest month in Yilan is July (26.7 °C on average); the coldest is January (13.8 °C).

How much does it rain in Yilan?

Yilan receives on average 3,198 mm of precipitation per year, spread over about 270 rainy days.

Is it sunny in Yilan?

Yilan gets on average 8.0 hours of sunshine per day, roughly 2,920 hours per year over 1940-2025.

What is the biggest single-day snowfall in Yilan?

The heaviest 24-hour snowfall measured in Yilan between 1940 and 2025 was 24 January 2016, with 2.1 cm.

Are there tropical nights in Yilan?

Yes: Yilan has on average 165 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Yilan?

In Yilan, between 1940 and 2025, the highest apparent temperature reached 42.8 °C on 16 July 1998, and the lowest was -3.5 °C on 24 January 2016.

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