Lý Sơn climate — normals and trends

Q: What is the climate of Lý Sơn?

Lý Sơn has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 26.3 °C and it receives 1,946 mm of precipitation per year.

Q: What is the hottest day ever recorded in Lý Sơn?

The hottest day measured in Lý Sơn between 1940 and 2025 was 20 July 2019, reaching 35.0 °C.

Q: What is the coldest day in Lý Sơn?

The coldest day measured in Lý Sơn between 1940 and 2025 was 7 January 1940, at 16.9 °C.

Q: Does it snow in Lý Sơn?

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

Q: Has the climate of Lý Sơn warmed?

Yes: Lý Sơn warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Lý Sơn?

The wettest day measured in Lý Sơn between 1940 and 2025 was 13 May 1947, with 295 mm of rain in 24 hours.

Q: What was the windiest day in Lý Sơn?

The windiest day measured in Lý Sơn between 1940 and 2025 was 29 September 2009, with winds reaching 82.2 km/h.

Q: What is the warmest month in Lý Sơn?

The warmest month in Lý Sơn is June (29.4 °C on average); the coldest is January (22.5 °C).

Q: How much does it rain in Lý Sơn?

Lý Sơn receives on average 1,946 mm of precipitation per year, spread over about 197 rainy days.

Q: Is it sunny in Lý Sơn?

Lý Sơn gets on average 10.1 hours of sunshine per day, roughly 3,687 hours per year over 1940-2025.

Lý Sơn (Vietnam) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 26.3 °C and it receives 1,946 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 June (29.4 °C on average) and the coldest is January (22.5 °C). Rainfall peaks in October.

Lý Sơn averages 0 frost days, 120 hot days (≥ 30 °C) and 197 rainy days per year.

Lý Sơn has warmed by +1.2 °C between 1940 and 2025, or +0.14 °C per decade. This trend is statistically significant.

The hottest day of the period reached 35.0 °C (on 20 July 2019) and the coldest 16.9 °C (on 7 January 1940).

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

Lý SơnQuang Ngai

coords: 15.37°, 109.12°
period: 1940–2025 · 86 yrs

AmTropical monsoonWarmest monthJuneColdest monthJanuaryWettest monthOctoberDriest monthApril

Mean daily temperature

26.3°C

Average daily high

28.0°C

Average daily low

24.8°C

Annual rainfall

1,946mm

Sunshine / day

10.1h

Mean relative humidity

83%

Average peak wind

19.3km/h

Seasonal range

6.9°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

120 d/yr

Rainy days (≥ 1 mm)

197 d/yr

Annual snowfall

0.0 cm

Average feels-like high

32.6 °C

Average feels-like low

28.3 °C

Average peak gust

31.1 km/h

Tropical nights (≥ 20 °C)

354 d/yr

Solar radiation

18.8 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.2 °C

since 1940

+0.1 °C per decade · r² = 0.57 · 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

35.0 °C

20 July 2019

Coldest day

16.9 °C

7 January 1940

Wettest day

295 mm

13 May 1947

Windiest day

82.2 km/h

29 September 2009

Strongest gust

143.6 km/h

29 September 2009

Hottest feels-like

43.6 °C

4 June 2021

Coldest feels-like

13.2 °C

11 January 1955

Sunniest day

12.7 h

16 June 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	33.7 °C4 August 2025	18.0 °C23 January 2025	26.5 °C	2,602 mm	142
2024	34.5 °C14 June 2024	21.3 °C24 January 2024	27.4 °C	2,146 mm	161
2023	34.1 °C1 June 2023	19.2 °C30 January 2023	27.2 °C	2,180 mm	157
2022	33.0 °C29 June 2022	19.5 °C24 February 2022	26.6 °C	2,388 mm	129
2021	35.0 °C29 July 2021	17.9 °C12 January 2021	26.9 °C	2,587 mm	141
2020	33.9 °C7 September 2020	20.0 °C7 February 2020	27.1 °C	2,248 mm	151
2019	35.0 °C20 July 2019	20.3 °C10 December 2019	27.5 °C	1,467 mm	158
2018	33.7 °C7 July 2018	17.6 °C6 February 2018	26.9 °C	1,578 mm	145
2017	33.5 °C4 June 2017	19.2 °C20 December 2017	26.9 °C	2,511 mm	152
2016	34.3 °C14 August 2016	18.1 °C25 January 2016	27.0 °C	2,353 mm	151
2015	34.6 °C4 July 2015	18.5 °C25 January 2015	27.0 °C	1,437 mm	146
2014	33.8 °C27 June 2014	18.3 °C15 January 2014	26.6 °C	1,524 mm	148
2013	34.4 °C10 June 2013	18.9 °C19 December 2013	26.6 °C	1,821 mm	121
2012	33.3 °C13 June 2012	20.5 °C30 December 2012	26.9 °C	1,603 mm	144
2011	34.1 °C6 August 2011	17.8 °C7 February 2011	26.1 °C	2,271 mm	131
2010	34.0 °C2 June 2010	20.1 °C18 December 2010	27.0 °C	2,341 mm	136
2009	33.4 °C14 June 2009	19.3 °C11 January 2009	26.6 °C	2,440 mm	121
2008	33.0 °C24 June 2008	19.0 °C13 February 2008	26.1 °C	2,714 mm	130
2007	33.1 °C24 May 2007	19.0 °C3 February 2007	26.4 °C	2,258 mm	120
2006	33.2 °C9 June 2006	18.1 °C13 January 2006	26.5 °C	1,896 mm	120
2005	33.7 °C12 June 2005	18.5 °C6 March 2005	26.4 °C	2,275 mm	127
2004	33.5 °C2 July 2004	17.3 °C15 February 2004	26.3 °C	1,377 mm	127
2003	33.3 °C11 June 2003	18.7 °C11 January 2003	26.5 °C	1,736 mm	134
2002	33.3 °C19 July 2002	19.9 °C5 February 2002	26.5 °C	1,659 mm	113
2001	33.5 °C31 July 2001	19.5 °C31 December 2001	26.5 °C	1,893 mm	130
2000	33.5 °C12 August 2000	19.5 °C10 February 2000	26.2 °C	2,374 mm	105
1999	33.3 °C20 July 1999	17.2 °C25 December 1999	26.4 °C	3,005 mm	118
1998	34.4 °C17 June 1998	20.2 °C16 December 1998	27.2 °C	2,249 mm	150
1997	33.2 °C13 August 1997	18.5 °C13 January 1997	26.5 °C	1,535 mm	123
1996	33.2 °C17 July 1996	18.9 °C18 January 1996	26.0 °C	2,311 mm	103
1995	32.9 °C12 August 1995	18.5 °C5 February 1995	26.1 °C	1,760 mm	117
1994	33.4 °C4 May 1994	19.4 °C24 January 1994	26.5 °C	1,445 mm	131
1993	33.4 °C5 June 1993	17.2 °C30 January 1993	26.2 °C	1,916 mm	134
1992	33.0 °C30 May 1992	17.9 °C29 January 1992	26.1 °C	1,944 mm	120
1991	32.6 °C11 August 1991	19.5 °C8 February 1991	26.5 °C	1,335 mm	113
1990	32.6 °C11 July 1990	18.3 °C30 January 1990	26.4 °C	2,300 mm	113
1989	33.0 °C20 July 1989	19.2 °C9 February 1989	26.1 °C	1,806 mm	103
1988	34.2 °C24 May 1988	19.8 °C13 December 1988	26.3 °C	2,218 mm	122
1987	33.5 °C30 June 1987	19.2 °C7 December 1987	26.6 °C	1,768 mm	135
1986	33.3 °C2 July 1986	17.5 °C2 March 1986	26.1 °C	1,814 mm	109
1985	32.9 °C31 May 1985	19.3 °C17 December 1985	26.1 °C	1,958 mm	89
1984	32.2 °C19 July 1984	18.0 °C18 January 1984	25.9 °C	1,764 mm	97
1983	33.2 °C3 June 1983	17.8 °C24 January 1983	26.2 °C	1,711 mm	121
1982	32.8 °C3 August 1982	17.5 °C30 December 1982	26.3 °C	1,332 mm	119
1981	33.7 °C26 August 1981	18.8 °C20 January 1981	26.5 °C	2,217 mm	132
1980	33.6 °C6 August 1980	19.8 °C24 December 1980	26.4 °C	2,387 mm	110
1979	34.1 °C15 May 1979	19.5 °C1 February 1979	26.5 °C	1,850 mm	126
1978	33.2 °C1 June 1978	19.2 °C24 January 1978	26.3 °C	2,165 mm	114
1977	33.9 °C26 June 1977	18.5 °C11 February 1977	26.1 °C	1,457 mm	111
1976	33.3 °C17 June 1976	18.6 °C12 January 1976	26.1 °C	1,811 mm	117
1975	33.1 °C1 August 1975	17.1 °C30 December 1975	26.2 °C	2,270 mm	125
1974	33.6 °C4 July 1974	17.6 °C2 January 1974	26.1 °C	2,013 mm	127
1973	33.3 °C18 August 1973	19.1 °C29 December 1973	26.5 °C	2,197 mm	121
1972	32.9 °C24 May 1972	17.6 °C23 January 1972	26.1 °C	2,496 mm	105
1971	32.5 °C5 August 1971	18.7 °C14 February 1971	25.6 °C	3,512 mm	90
1970	33.4 °C29 August 1970	17.3 °C23 January 1970	26.3 °C	2,196 mm	130
1969	33.2 °C24 May 1969	19.1 °C5 February 1969	26.3 °C	1,843 mm	122
1968	32.8 °C10 July 1968	18.5 °C29 January 1968	26.0 °C	1,292 mm	111
1967	33.3 °C3 August 1967	17.1 °C16 January 1967	25.8 °C	1,960 mm	115
1966	32.6 °C13 May 1966	20.1 °C1 January 1966	26.4 °C	2,233 mm	102
1965	32.9 °C8 July 1965	18.7 °C6 January 1965	26.1 °C	1,964 mm	114
1964	33.6 °C2 August 1964	18.9 °C27 February 1964	26.1 °C	2,318 mm	123
1963	32.5 °C1 June 1963	17.0 °C15 January 1963	25.6 °C	1,234 mm	100
1962	33.4 °C30 May 1962	18.7 °C28 January 1962	25.8 °C	1,548 mm	117
1961	32.9 °C3 August 1961	18.0 °C17 January 1961	26.1 °C	1,622 mm	111
1960	32.8 °C14 June 1960	17.7 °C4 January 1960	26.1 °C	2,189 mm	110
1959	33.7 °C13 June 1959	19.1 °C20 January 1959	26.2 °C	1,342 mm	121
1958	32.6 °C23 May 1958	19.1 °C5 January 1958	25.9 °C	1,757 mm	106
1957	33.5 °C15 June 1957	18.6 °C14 February 1957	26.0 °C	1,323 mm	110
1956	33.0 °C13 June 1956	17.8 °C31 January 1956	25.8 °C	2,041 mm	101
1955	32.5 °C24 July 1955	17.0 °C11 January 1955	25.7 °C	2,099 mm	105
1954	33.1 °C19 August 1954	18.7 °C11 February 1954	26.2 °C	1,400 mm	122
1953	32.8 °C7 August 1953	19.7 °C11 January 1953	26.4 °C	2,386 mm	117
1952	33.6 °C12 July 1952	18.1 °C23 January 1952	26.4 °C	1,667 mm	123
1951	33.2 °C14 June 1951	19.0 °C2 February 1951	26.4 °C	1,561 mm	129
1950	33.2 °C17 August 1950	20.0 °C5 March 1950	26.4 °C	1,316 mm	135
1949	33.4 °C14 June 1949	18.5 °C9 January 1949	25.9 °C	1,726 mm	105
1948	32.9 °C18 June 1948	18.7 °C21 January 1948	25.7 °C	1,308 mm	106
1947	32.8 °C12 June 1947	19.2 °C5 January 1947	25.8 °C	1,980 mm	103
1946	33.1 °C14 July 1946	17.9 °C20 February 1946	26.0 °C	2,054 mm	115
1945	32.4 °C1 August 1945	18.4 °C17 January 1945	25.2 °C	1,645 mm	87
1944	32.3 °C4 August 1944	17.7 °C27 January 1944	25.5 °C	2,313 mm	102
1943	31.9 °C19 June 1943	17.6 °C25 January 1943	25.2 °C	1,770 mm	94
1942	33.0 °C10 August 1942	18.1 °C18 December 1942	25.8 °C	1,368 mm	90
1941	31.8 °C22 July 1941	20.6 °C2 February 1941	26.0 °C	1,950 mm	86
1940	32.0 °C14 June 1940	16.9 °C7 January 1940	25.5 °C	1,681 mm	86

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

28.2 °C

+0.2 °C

Hot days (≥ 30 °C)

142 d/yr

+22

Frost days (< 0 °C)

0 d/yr

Annual rainfall

2602 mm

+656 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	23.3 °C	-0.7 °C	112 mm	-12 mm
Feb	24.2 °C	-0.5 °C	130 mm	+57 mm
Mar	25.7 °C	-0.6 °C	195 mm	+131 mm
Apr	27.9 °C	-0.6 °C	25 mm	-31 mm
May	31.1 °C	+0.6 °C	58 mm	-27 mm
Jun	31.6 °C	+0.2 °C	202 mm	+116 mm
Jul	31.9 °C	+0.5 °C	87 mm	+13 mm
Aug	31.6 °C	+0.4 °C	139 mm	+30 mm
Sep	30.3 °C	+0.6 °C	280 mm	+17 mm
Oct	28.5 °C	+0.8 °C	511 mm	+127 mm
Nov	26.3 °C	+0.1 °C	630 mm	+267 mm
Dec	25.4 °C	+0.9 °C	234 mm	-30 mm

The year's extremes

Hottest day

33.7 °C

4 Aug 2025

Coldest day

18.0 °C

23 Jan 2025

Wettest day

108.6 mm

12 Jun 2025

Windiest day

49.7 km/h

6 Nov 2025

Strongest gust

85.3 km/h

6 Nov 2025

Hottest feels-like

42.5 °C

16 Jul 2025

Coldest feels-like

16.9 °C

12 Jan 2025

Sunniest day

12.7 h

16 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 Lý Sơn?

Lý Sơn has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 26.3 °C and it receives 1,946 mm of precipitation per year.

What is the hottest day ever recorded in Lý Sơn?

The hottest day measured in Lý Sơn between 1940 and 2025 was 20 July 2019, reaching 35.0 °C.

What is the coldest day in Lý Sơn?

The coldest day measured in Lý Sơn between 1940 and 2025 was 7 January 1940, at 16.9 °C.

Does it snow in Lý Sơn?

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

Has the climate of Lý Sơn warmed?

Yes: Lý Sơn warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Lý Sơn?

The wettest day measured in Lý Sơn between 1940 and 2025 was 13 May 1947, with 295 mm of rain in 24 hours.

What was the windiest day in Lý Sơn?

The windiest day measured in Lý Sơn between 1940 and 2025 was 29 September 2009, with winds reaching 82.2 km/h.

What is the warmest month in Lý Sơn?

The warmest month in Lý Sơn is June (29.4 °C on average); the coldest is January (22.5 °C).

How much does it rain in Lý Sơn?

Lý Sơn receives on average 1,946 mm of precipitation per year, spread over about 197 rainy days.

Is it sunny in Lý Sơn?

Lý Sơn gets on average 10.1 hours of sunshine per day, roughly 3,687 hours per year over 1940-2025.

Are there tropical nights in Lý Sơn?

Yes: Lý Sơn has on average 354 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Lý Sơn?

In Lý Sơn, between 1940 and 2025, the highest apparent temperature reached 43.6 °C on 4 June 2021, and the lowest was 13.2 °C on 11 January 1955.

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