Dien Bien Phu climate — normals and trends

Q: What is the climate of Dien Bien Phu?

Dien Bien Phu has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 20.7 °C and it receives 1,915 mm of precipitation per year.

Q: What is the hottest day ever recorded in Dien Bien Phu?

The hottest day measured in Dien Bien Phu between 1940 and 2025 was 19 May 2019, reaching 38.1 °C.

Q: What is the coldest day in Dien Bien Phu?

The coldest day measured in Dien Bien Phu between 1940 and 2025 was 2 January 1974, at 0.1 °C.

Q: Does it snow in Dien Bien Phu?

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

Q: Has the climate of Dien Bien Phu warmed?

Yes: Dien Bien Phu warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Dien Bien Phu?

The wettest day measured in Dien Bien Phu between 1940 and 2025 was 26 September 2008, with 301 mm of rain in 24 hours.

Q: What was the windiest day in Dien Bien Phu?

The windiest day measured in Dien Bien Phu between 1940 and 2025 was 7 March 1980, with winds reaching 19.9 km/h.

Q: What is the warmest month in Dien Bien Phu?

The warmest month in Dien Bien Phu is June (24.0 °C on average); the coldest is January (15.3 °C).

Q: How much does it rain in Dien Bien Phu?

Dien Bien Phu receives on average 1,915 mm of precipitation per year, spread over about 194 rainy days.

Q: Is it sunny in Dien Bien Phu?

Dien Bien Phu gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.

Dien Bien Phu (Vietnam) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 20.7 °C and it receives 1,915 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 (24.0 °C on average) and the coldest is January (15.3 °C). Rainfall peaks in July.

Dien Bien Phu averages 0 frost days, 47 hot days (≥ 30 °C) and 194 rainy days per year.

Dien Bien Phu has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.

The hottest day of the period reached 38.1 °C (on 19 May 2019) and the coldest 0.1 °C (on 2 January 1974).

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

Dien Bien PhuĐiện Biên Province

coords: 21.39°, 103.02°
period: 1940–2025 · 86 yrs

CwaHumid subtropical, dry winterWarmest monthJuneColdest monthJanuaryWettest monthJulyDriest monthDecember

Mean daily temperature

20.7°C

Average daily high

25.8°C

Average daily low

17.0°C

Annual rainfall

1,915mm

Sunshine / day

8.4h

Mean relative humidity

82%

Average peak wind

7.7km/h

Seasonal range

8.7°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

47 d/yr

Rainy days (≥ 1 mm)

194 d/yr

Annual snowfall

0.0 cm

Average feels-like high

28.3 °C

Average feels-like low

18.7 °C

Average peak gust

30.2 km/h

Tropical nights (≥ 20 °C)

132 d/yr

Solar radiation

15.4 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.9 °C

since 1940

+0.2 °C per decade · r² = 0.67 · 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

19 May 2019

Coldest day

0.1 °C

2 January 1974

Wettest day

301 mm

26 September 2008

Windiest day

19.9 km/h

7 March 1980

Strongest gust

86.4 km/h

23 July 2003

Hottest feels-like

41.0 °C

20 May 2019

Coldest feels-like

-2.7 °C

2 January 1974

Sunniest day

13.1 h

14 June 2013

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	34.6 °C9 May 2025	5.9 °C14 January 2025	21.4 °C	2,207 mm	84
2024	37.7 °C23 April 2024	8.0 °C25 January 2024	22.5 °C	2,186 mm	96
2023	36.5 °C19 April 2023	5.8 °C30 January 2023	22.2 °C	1,350 mm	112
2022	33.4 °C26 April 2022	7.0 °C19 December 2022	21.4 °C	1,875 mm	65
2021	33.9 °C22 May 2021	5.3 °C12 January 2021	21.4 °C	1,565 mm	93
2020	35.9 °C22 May 2020	8.2 °C30 January 2020	21.9 °C	1,468 mm	95
2019	38.1 °C19 May 2019	3.4 °C8 December 2019	22.5 °C	1,354 mm	118
2018	32.7 °C10 May 2018	6.5 °C6 February 2018	21.3 °C	2,301 mm	53
2017	34.5 °C6 June 2017	4.5 °C21 December 2017	21.5 °C	1,876 mm	73
2016	35.2 °C11 April 2016	2.3 °C25 January 2016	21.7 °C	1,593 mm	90
2015	36.5 °C8 May 2015	6.8 °C14 January 2015	22.0 °C	1,709 mm	105
2014	34.7 °C23 April 2014	4.2 °C23 January 2014	21.7 °C	1,674 mm	92
2013	34.6 °C2 March 2013	4.4 °C20 December 2013	21.4 °C	1,940 mm	75
2012	35.6 °C3 May 2012	7.9 °C16 January 2012	21.7 °C	1,814 mm	62
2011	32.5 °C17 April 2011	6.7 °C12 January 2011	20.6 °C	1,572 mm	35
2010	35.5 °C11 April 2010	7.9 °C19 February 2010	21.9 °C	1,494 mm	101
2009	33.0 °C9 May 2009	6.7 °C14 January 2009	21.7 °C	1,625 mm	74
2008	32.1 °C8 April 2008	5.7 °C14 February 2008	20.6 °C	2,505 mm	27
2007	35.5 °C2 April 2007	6.5 °C29 January 2007	21.3 °C	1,659 mm	50
2006	33.7 °C11 April 2006	4.5 °C23 December 2006	21.7 °C	1,654 mm	65
2005	33.6 °C17 May 2005	5.8 °C20 December 2005	21.4 °C	1,941 mm	66
2004	33.8 °C29 March 2004	6.3 °C9 February 2004	20.9 °C	1,849 mm	38
2003	34.8 °C8 May 2003	6.5 °C7 January 2003	21.5 °C	1,447 mm	59
2002	34.5 °C2 May 2002	7.9 °C5 January 2002	21.3 °C	2,077 mm	58
2001	33.4 °C10 April 2001	5.6 °C26 December 2001	21.2 °C	1,822 mm	32
2000	34.1 °C3 April 2000	6.6 °C2 February 2000	21.1 °C	1,807 mm	41
1999	32.8 °C26 February 1999	0.7 °C27 December 1999	21.1 °C	1,526 mm	37
1998	33.7 °C17 March 1998	7.7 °C12 February 1998	21.9 °C	1,796 mm	66
1997	33.2 °C5 June 1997	8.2 °C25 January 1997	21.0 °C	2,048 mm	28
1996	32.5 °C17 March 1996	3.4 °C1 January 1996	20.6 °C	2,204 mm	23
1995	33.4 °C17 March 1995	4.4 °C31 December 1995	20.7 °C	2,120 mm	46
1994	32.5 °C2 May 1994	8.4 °C1 January 1994	20.9 °C	2,674 mm	20
1993	32.1 °C5 April 1993	3.5 °C28 December 1993	20.5 °C	1,921 mm	22
1992	33.9 °C26 March 1992	6.7 °C11 November 1992	20.7 °C	2,037 mm	72
1991	33.1 °C24 March 1991	7.4 °C29 December 1991	21.2 °C	2,065 mm	48
1990	34.4 °C22 April 1990	6.9 °C7 December 1990	20.6 °C	2,256 mm	33
1989	34.4 °C21 April 1989	6.2 °C9 January 1989	20.5 °C	1,962 mm	40
1988	34.2 °C22 March 1988	7.2 °C18 December 1988	21.0 °C	1,623 mm	63
1987	34.5 °C26 May 1987	4.6 °C24 December 1987	21.1 °C	1,723 mm	59
1986	33.9 °C2 April 1986	4.3 °C2 March 1986	20.7 °C	2,021 mm	48
1985	33.8 °C7 May 1985	3.5 °C25 December 1985	20.4 °C	1,895 mm	25
1984	34.1 °C4 April 1984	5.6 °C9 January 1984	20.6 °C	2,031 mm	38
1983	34.0 °C24 May 1983	4.5 °C4 December 1983	20.3 °C	2,123 mm	61
1982	32.8 °C24 March 1982	2.9 °C27 December 1982	20.7 °C	2,386 mm	40
1981	34.0 °C8 April 1981	7.1 °C4 December 1981	20.7 °C	2,743 mm	31
1980	36.0 °C4 May 1980	6.7 °C9 February 1980	21.1 °C	1,947 mm	53
1979	33.4 °C13 May 1979	8.0 °C19 November 1979	20.8 °C	1,786 mm	34
1978	31.9 °C1 July 1978	5.9 °C17 December 1978	20.3 °C	2,346 mm	29
1977	32.2 °C9 June 1977	6.4 °C2 February 1977	20.0 °C	2,180 mm	32
1976	31.3 °C18 June 1976	1.6 °C1 January 1976	19.9 °C	2,218 mm	18
1975	34.3 °C29 April 1975	0.7 °C31 December 1975	20.1 °C	2,093 mm	36
1974	33.0 °C9 March 1974	0.1 °C2 January 1974	20.2 °C	2,014 mm	22
1973	35.4 °C8 April 1973	1.4 °C31 December 1973	20.9 °C	2,045 mm	45
1972	32.8 °C12 May 1972	5.4 °C10 February 1972	20.4 °C	2,497 mm	38
1971	34.1 °C31 March 1971	2.1 °C10 January 1971	19.7 °C	2,130 mm	34
1970	34.0 °C11 May 1970	6.8 °C31 January 1970	20.5 °C	2,139 mm	41
1969	35.0 °C15 May 1969	5.8 °C30 November 1969	20.7 °C	1,876 mm	59
1968	32.1 °C29 March 1968	5.6 °C9 February 1968	20.3 °C	2,235 mm	33
1967	34.6 °C30 March 1967	4.1 °C17 January 1967	20.3 °C	1,648 mm	53
1966	33.4 °C29 April 1966	7.2 °C29 December 1966	20.5 °C	2,002 mm	29
1965	34.0 °C3 April 1965	5.8 °C18 December 1965	19.9 °C	2,155 mm	31
1964	32.2 °C28 May 1964	4.4 °C19 December 1964	20.2 °C	2,139 mm	22
1963	34.5 °C23 April 1963	4.1 °C26 January 1963	20.2 °C	2,145 mm	44
1962	33.0 °C21 March 1962	5.4 °C4 January 1962	20.3 °C	1,648 mm	36
1961	32.1 °C25 March 1961	2.4 °C18 January 1961	20.6 °C	2,205 mm	27
1960	36.7 °C27 April 1960	5.2 °C3 January 1960	21.0 °C	2,054 mm	62
1959	36.6 °C11 April 1959	5.9 °C11 January 1959	20.7 °C	1,844 mm	44
1958	37.0 °C25 April 1958	5.2 °C1 February 1958	20.8 °C	2,091 mm	74
1957	35.6 °C14 May 1957	5.0 °C12 February 1957	21.1 °C	1,792 mm	65
1956	37.5 °C19 April 1956	4.5 °C10 January 1956	20.5 °C	1,738 mm	46
1955	34.0 °C22 March 1955	2.2 °C12 January 1955	20.1 °C	1,778 mm	31
1954	35.1 °C17 April 1954	3.6 °C17 December 1954	20.6 °C	1,395 mm	32
1953	32.0 °C23 May 1953	6.7 °C13 December 1953	20.1 °C	1,505 mm	15
1952	33.1 °C3 May 1952	5.5 °C13 December 1952	20.6 °C	2,064 mm	24
1951	33.8 °C10 April 1951	8.3 °C31 January 1951	20.0 °C	2,262 mm	10
1950	34.7 °C23 April 1950	5.9 °C7 January 1950	20.3 °C	2,305 mm	26
1949	32.4 °C7 June 1949	5.3 °C17 January 1949	20.5 °C	1,455 mm	26
1948	33.7 °C14 March 1948	2.9 °C4 January 1948	19.9 °C	1,814 mm	15
1947	32.9 °C7 May 1947	4.3 °C31 December 1947	19.9 °C	1,587 mm	10
1946	35.7 °C19 March 1946	3.4 °C11 January 1946	20.3 °C	1,245 mm	40
1945	30.9 °C3 April 1945	5.6 °C18 January 1945	19.5 °C	1,594 mm	7
1944	34.1 °C9 April 1944	4.4 °C9 December 1944	19.9 °C	1,768 mm	23
1943	33.8 °C24 March 1943	5.5 °C13 December 1943	19.7 °C	1,785 mm	23
1942	35.6 °C18 April 1942	4.9 °C7 December 1942	19.8 °C	2,058 mm	25
1941	33.3 °C24 March 1941	6.9 °C3 February 1941	20.1 °C	1,961 mm	25
1940	31.0 °C10 March 1940	4.3 °C1 January 1940	19.7 °C	1,584 mm	5

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

26.5 °C

+0.7 °C

Hot days (≥ 30 °C)

84 d/yr

+37

Frost days (< 0 °C)

0 d/yr

Annual rainfall

2207 mm

+292 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	22.1 °C	+0.7 °C	4 mm	-27 mm
Feb	24.6 °C	+0.8 °C	15 mm	-20 mm
Mar	27.5 °C	+0.4 °C	15 mm	-45 mm
Apr	28.8 °C	+0.3 °C	92 mm	-29 mm
May	29.0 °C	+0.4 °C	181 mm	-29 mm
Jun	28.7 °C	+1.0 °C	309 mm	-35 mm
Jul	27.7 °C	+0.4 °C	676 mm	+299 mm
Aug	28.5 °C	+1.2 °C	324 mm	-51 mm
Sep	28.9 °C	+1.6 °C	214 mm	-2 mm
Oct	26.9 °C	+1.1 °C	299 mm	+210 mm
Nov	22.9 °C	-0.7 °C	67 mm	+31 mm
Dec	22.7 °C	+1.5 °C	13 mm	-10 mm

The year's extremes

Hottest day

34.6 °C

9 May 2025

Coldest day

5.9 °C

14 Jan 2025

Wettest day

222.5 mm

7 Oct 2025

Windiest day

15.5 km/h

1 Jun 2025

Strongest gust

65.9 km/h

29 Sep 2025

Hottest feels-like

38.2 °C

9 May 2025

Coldest feels-like

4.1 °C

14 Jan 2025

Sunniest day

12.7 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 Dien Bien Phu?

Dien Bien Phu has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 20.7 °C and it receives 1,915 mm of precipitation per year.

What is the hottest day ever recorded in Dien Bien Phu?

The hottest day measured in Dien Bien Phu between 1940 and 2025 was 19 May 2019, reaching 38.1 °C.

What is the coldest day in Dien Bien Phu?

The coldest day measured in Dien Bien Phu between 1940 and 2025 was 2 January 1974, at 0.1 °C.

Does it snow in Dien Bien Phu?

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

Has the climate of Dien Bien Phu warmed?

Yes: Dien Bien Phu warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Dien Bien Phu?

The wettest day measured in Dien Bien Phu between 1940 and 2025 was 26 September 2008, with 301 mm of rain in 24 hours.

What was the windiest day in Dien Bien Phu?

The windiest day measured in Dien Bien Phu between 1940 and 2025 was 7 March 1980, with winds reaching 19.9 km/h.

What is the warmest month in Dien Bien Phu?

The warmest month in Dien Bien Phu is June (24.0 °C on average); the coldest is January (15.3 °C).

How much does it rain in Dien Bien Phu?

Dien Bien Phu receives on average 1,915 mm of precipitation per year, spread over about 194 rainy days.

Is it sunny in Dien Bien Phu?

Dien Bien Phu gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.

Are there tropical nights in Dien Bien Phu?

Yes: Dien Bien Phu has on average 132 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Dien Bien Phu?

In Dien Bien Phu, between 1940 and 2025, the highest apparent temperature reached 41.0 °C on 20 May 2019, and the lowest was -2.7 °C on 2 January 1974.

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