Mường Lay climate — normals and trends

Q: What is the climate of Mường Lay?

Mường Lay has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 21.1 °C and it receives 2,513 mm of precipitation per year.

Q: What is the hottest day ever recorded in Mường Lay?

The hottest day measured in Mường Lay between 1940 and 2025 was 28 April 2024, reaching 38.1 °C.

Q: What is the coldest day in Mường Lay?

The coldest day measured in Mường Lay between 1940 and 2025 was 25 December 1975, at 1.1 °C.

Q: Does it snow in Mường Lay?

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

Q: Has the climate of Mường Lay warmed?

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

Q: What is the wettest day in Mường Lay?

The wettest day measured in Mường Lay between 1940 and 2025 was 4 July 1964, with 274 mm of rain in 24 hours.

Q: What was the windiest day in Mường Lay?

The windiest day measured in Mường Lay between 1940 and 2025 was 16 March 1996, with winds reaching 15.9 km/h.

Q: What is the warmest month in Mường Lay?

The warmest month in Mường Lay is June (24.6 °C on average); the coldest is January (15.2 °C).

Q: How much does it rain in Mường Lay?

Mường Lay receives on average 2,513 mm of precipitation per year, spread over about 220 rainy days.

Q: Is it sunny in Mường Lay?

Mường Lay gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.

Mường Lay (Vietnam) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 21.1 °C and it receives 2,513 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 (24.6 °C on average) and the coldest is January (15.2 °C). Rainfall peaks in June.

Mường Lay averages 0 frost days, 59 hot days (≥ 30 °C) and 220 rainy days per year.

Mường Lay 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 38.1 °C (on 28 April 2024) and the coldest 1.1 °C (on 25 December 1975).

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

Mường LayĐiện Biên Province

coords: 22.00°, 103.13°
period: 1940–2025 · 86 yrs

CwaHumid subtropical, dry winterWarmest monthJuneColdest monthJanuaryWettest monthJuneDriest monthDecember

Mean daily temperature

21.1°C

Average daily high

25.8°C

Average daily low

17.5°C

Annual rainfall

2,513mm

Sunshine / day

8.1h

Mean relative humidity

84%

Average peak wind

4.9km/h

Seasonal range

9.4°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

59 d/yr

Rainy days (≥ 1 mm)

220 d/yr

Annual snowfall

0.0 cm

Average feels-like high

29.2 °C

Average feels-like low

19.7 °C

Average peak gust

26.8 km/h

Tropical nights (≥ 20 °C)

152 d/yr

Solar radiation

14.7 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.0 °C

since 1940

+0.2 °C per decade · r² = 0.73 · 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

38.1 °C

28 April 2024

Coldest day

1.1 °C

25 December 1975

Wettest day

274 mm

4 July 1964

Windiest day

15.9 km/h

16 March 1996

Strongest gust

76.3 km/h

9 July 1956

Hottest feels-like

42.5 °C

31 May 2023

Coldest feels-like

-1.1 °C

25 December 1975

Sunniest day

13.1 h

14 June 2013

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	34.3 °C6 May 2025	6.8 °C12 January 2025	21.9 °C	2,503 mm	97
2024	38.1 °C28 April 2024	9.4 °C24 January 2024	22.8 °C	2,698 mm	124
2023	37.9 °C19 April 2023	6.6 °C30 January 2023	22.6 °C	1,849 mm	119
2022	34.7 °C25 July 2022	7.2 °C19 December 2022	21.8 °C	2,419 mm	84
2021	34.8 °C24 April 2021	6.1 °C10 January 2021	22.0 °C	2,154 mm	109
2020	34.9 °C21 May 2020	8.5 °C26 January 2020	21.9 °C	2,308 mm	93
2019	38.0 °C19 May 2019	3.6 °C8 December 2019	22.5 °C	2,027 mm	123
2018	33.6 °C18 July 2018	7.5 °C6 February 2018	21.7 °C	2,462 mm	68
2017	34.4 °C11 April 2017	5.2 °C21 December 2017	21.9 °C	2,359 mm	84
2016	34.5 °C12 April 2016	3.9 °C25 January 2016	22.2 °C	2,056 mm	121
2015	36.8 °C8 May 2015	6.9 °C15 January 2015	22.5 °C	2,562 mm	117
2014	35.4 °C24 April 2014	5.0 °C23 January 2014	22.1 °C	2,309 mm	111
2013	34.2 °C28 March 2013	5.5 °C20 December 2013	21.8 °C	2,644 mm	97
2012	35.7 °C3 May 2012	7.6 °C16 January 2012	22.0 °C	2,322 mm	80
2011	33.3 °C17 April 2011	8.1 °C8 February 2011	21.0 °C	1,874 mm	55
2010	36.2 °C13 April 2010	9.1 °C4 January 2010	22.5 °C	2,089 mm	119
2009	34.0 °C24 March 2009	7.6 °C16 January 2009	22.3 °C	1,885 mm	103
2008	34.1 °C23 September 2008	6.7 °C1 December 2008	21.2 °C	2,867 mm	60
2007	36.4 °C2 April 2007	6.4 °C29 January 2007	21.7 °C	2,280 mm	79
2006	34.0 °C11 April 2006	5.3 °C23 December 2006	21.9 °C	2,209 mm	81
2005	33.7 °C12 March 2005	7.2 °C22 December 2005	21.7 °C	2,275 mm	86
2004	34.0 °C1 July 2004	6.8 °C9 February 2004	21.3 °C	2,431 mm	60
2003	34.4 °C7 May 2003	7.1 °C7 January 2003	21.9 °C	2,101 mm	80
2002	34.0 °C28 March 2002	9.1 °C5 January 2002	21.8 °C	2,783 mm	81
2001	33.8 °C10 April 2001	6.9 °C26 December 2001	21.7 °C	2,297 mm	57
2000	34.9 °C3 April 2000	7.4 °C2 February 2000	21.5 °C	2,195 mm	53
1999	33.0 °C20 March 1999	1.8 °C25 December 1999	21.6 °C	2,099 mm	51
1998	34.9 °C17 March 1998	7.2 °C16 December 1998	22.2 °C	2,410 mm	87
1997	33.7 °C5 June 1997	8.7 °C1 January 1997	21.2 °C	2,914 mm	41
1996	33.4 °C20 March 1996	3.7 °C1 January 1996	21.1 °C	2,507 mm	41
1995	33.9 °C20 May 1995	4.3 °C31 December 1995	21.1 °C	2,744 mm	56
1994	33.5 °C2 May 1994	8.0 °C1 January 1994	21.4 °C	3,262 mm	45
1993	32.9 °C5 June 1993	3.4 °C30 January 1993	20.9 °C	2,984 mm	42
1992	35.4 °C9 May 1992	7.2 °C8 December 1992	21.0 °C	2,526 mm	92
1991	34.1 °C10 April 1991	8.7 °C29 December 1991	21.5 °C	3,121 mm	84
1990	34.3 °C22 April 1990	7.0 °C7 December 1990	21.1 °C	2,794 mm	52
1989	34.9 °C21 April 1989	6.1 °C9 January 1989	20.9 °C	2,625 mm	62
1988	34.0 °C6 April 1988	7.8 °C12 December 1988	21.3 °C	2,299 mm	63
1987	34.2 °C21 May 1987	5.0 °C27 December 1987	21.4 °C	2,459 mm	73
1986	34.8 °C2 April 1986	4.5 °C11 January 1986	21.0 °C	2,598 mm	55
1985	33.8 °C7 May 1985	3.8 °C25 December 1985	20.7 °C	2,545 mm	36
1984	35.1 °C4 April 1984	6.3 °C9 January 1984	21.0 °C	2,475 mm	58
1983	35.3 °C24 May 1983	4.7 °C4 December 1983	20.8 °C	3,271 mm	77
1982	33.5 °C12 May 1982	3.1 °C28 December 1982	21.1 °C	2,765 mm	60
1981	32.5 °C8 April 1981	7.7 °C12 January 1981	21.1 °C	3,449 mm	52
1980	34.0 °C3 May 1980	7.5 °C29 January 1980	21.4 °C	2,608 mm	61
1979	33.9 °C13 May 1979	8.1 °C11 January 1979	21.2 °C	2,401 mm	53
1978	32.4 °C29 July 1978	5.1 °C17 December 1978	20.8 °C	3,022 mm	47
1977	33.3 °C9 June 1977	7.3 °C2 February 1977	20.4 °C	2,811 mm	58
1976	32.3 °C18 June 1976	1.6 °C1 January 1976	20.4 °C	3,024 mm	37
1975	34.2 °C28 April 1975	1.1 °C25 December 1975	20.6 °C	2,854 mm	44
1974	32.8 °C8 May 1974	1.5 °C4 January 1974	20.6 °C	2,619 mm	42
1973	35.0 °C9 April 1973	2.7 °C31 December 1973	21.2 °C	2,796 mm	61
1972	33.2 °C11 May 1972	6.1 °C22 January 1972	20.8 °C	3,018 mm	53
1971	32.6 °C11 May 1971	3.7 °C10 January 1971	20.2 °C	2,973 mm	29
1970	34.2 °C11 May 1970	6.9 °C21 December 1970	20.9 °C	2,636 mm	60
1969	35.6 °C15 May 1969	5.3 °C30 November 1969	21.0 °C	2,546 mm	71
1968	32.8 °C26 July 1968	4.9 °C19 January 1968	20.6 °C	3,013 mm	40
1967	34.9 °C6 April 1967	5.0 °C17 January 1967	20.7 °C	2,474 mm	59
1966	34.0 °C29 April 1966	8.0 °C30 December 1966	20.6 °C	2,412 mm	23
1965	33.8 °C3 April 1965	6.0 °C17 January 1965	20.2 °C	2,852 mm	30
1964	32.8 °C28 May 1964	5.3 °C29 December 1964	20.6 °C	2,799 mm	32
1963	32.5 °C21 April 1963	4.6 °C28 January 1963	20.6 °C	2,975 mm	56
1962	33.8 °C21 March 1962	6.4 °C4 January 1962	20.9 °C	2,099 mm	61
1961	33.4 °C22 June 1961	3.2 °C17 January 1961	21.0 °C	2,870 mm	47
1960	36.4 °C27 April 1960	7.2 °C2 January 1960	21.3 °C	2,525 mm	65
1959	35.3 °C11 April 1959	6.9 °C11 January 1959	20.9 °C	2,387 mm	45
1958	36.6 °C25 April 1958	5.5 °C12 December 1958	21.2 °C	2,694 mm	83
1957	36.9 °C14 May 1957	5.6 °C13 February 1957	21.3 °C	2,260 mm	72
1956	35.9 °C19 April 1956	5.1 °C10 January 1956	20.8 °C	2,235 mm	40
1955	33.8 °C18 April 1955	4.0 °C13 January 1955	20.5 °C	2,103 mm	33
1954	35.9 °C17 April 1954	4.5 °C16 December 1954	20.9 °C	2,017 mm	43
1953	32.3 °C22 May 1953	6.7 °C27 January 1953	20.7 °C	2,204 mm	33
1952	33.7 °C3 May 1952	5.9 °C13 December 1952	20.8 °C	2,399 mm	33
1951	33.4 °C10 April 1951	8.9 °C1 February 1951	20.4 °C	2,927 mm	13
1950	34.4 °C22 April 1950	7.0 °C7 January 1950	20.5 °C	2,568 mm	28
1949	32.3 °C9 July 1949	6.9 °C11 January 1949	20.7 °C	2,418 mm	18
1948	33.5 °C14 March 1948	5.2 °C30 January 1948	20.2 °C	2,307 mm	18
1947	33.1 °C7 May 1947	5.2 °C31 December 1947	20.2 °C	2,212 mm	11
1946	36.4 °C19 March 1946	4.6 °C11 January 1946	20.6 °C	1,971 mm	33
1945	31.2 °C28 May 1945	6.7 °C20 January 1945	19.7 °C	2,146 mm	4
1944	33.2 °C9 April 1944	5.8 °C10 December 1944	20.1 °C	2,376 mm	13
1943	34.6 °C24 March 1943	6.4 °C24 January 1943	19.9 °C	2,471 mm	23
1942	35.6 °C17 April 1942	6.1 °C15 December 1942	20.0 °C	2,613 mm	22
1941	33.9 °C23 March 1941	6.5 °C3 February 1941	20.4 °C	2,533 mm	26
1940	31.1 °C26 April 1940	3.7 °C1 January 1940	20.1 °C	2,166 mm	11

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

26.7 °C

+0.9 °C

Hot days (≥ 30 °C)

97 d/yr

+38

Frost days (< 0 °C)

0 d/yr

Annual rainfall

2504 mm

-10 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	21.5 °C	+0.9 °C	14 mm	-41 mm
Feb	23.3 °C	+0.6 °C	46 mm	-24 mm
Mar	26.7 °C	+0.5 °C	54 mm	-83 mm
Apr	28.4 °C	+0.4 °C	149 mm	-86 mm
May	29.5 °C	+0.8 °C	333 mm	-1 mm
Jun	29.0 °C	+0.7 °C	499 mm	+45 mm
Jul	29.3 °C	+1.1 °C	492 mm	+57 mm
Aug	29.2 °C	+0.9 °C	392 mm	+10 mm
Sep	29.7 °C	+1.6 °C	200 mm	-10 mm
Oct	27.6 °C	+1.2 °C	225 mm	+122 mm
Nov	23.3 °C	-0.3 °C	89 mm	+29 mm
Dec	22.7 °C	+1.9 °C	12 mm	-27 mm

The year's extremes

Hottest day

34.3 °C

6 May 2025

Coldest day

6.8 °C

12 Jan 2025

Wettest day

118.4 mm

7 Oct 2025

Windiest day

11.9 km/h

4 Mar 2025

Strongest gust

59.4 km/h

29 Sep 2025

Hottest feels-like

40.4 °C

14 Jun 2025

Coldest feels-like

5.7 °C

12 Jan 2025

Sunniest day

12.9 h

13 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 Mường Lay?

Mường Lay has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 21.1 °C and it receives 2,513 mm of precipitation per year.

What is the hottest day ever recorded in Mường Lay?

The hottest day measured in Mường Lay between 1940 and 2025 was 28 April 2024, reaching 38.1 °C.

What is the coldest day in Mường Lay?

The coldest day measured in Mường Lay between 1940 and 2025 was 25 December 1975, at 1.1 °C.

Does it snow in Mường Lay?

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

Has the climate of Mường Lay warmed?

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

What is the wettest day in Mường Lay?

The wettest day measured in Mường Lay between 1940 and 2025 was 4 July 1964, with 274 mm of rain in 24 hours.

What was the windiest day in Mường Lay?

The windiest day measured in Mường Lay between 1940 and 2025 was 16 March 1996, with winds reaching 15.9 km/h.

What is the warmest month in Mường Lay?

The warmest month in Mường Lay is June (24.6 °C on average); the coldest is January (15.2 °C).

How much does it rain in Mường Lay?

Mường Lay receives on average 2,513 mm of precipitation per year, spread over about 220 rainy days.

Is it sunny in Mường Lay?

Mường Lay gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.

Are there tropical nights in Mường Lay?

Yes: Mường Lay has on average 152 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Mường Lay?

In Mường Lay, between 1940 and 2025, the highest apparent temperature reached 42.5 °C on 31 May 2023, and the lowest was -1.1 °C on 25 December 1975.

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