Bỉm Sơn climate — normals and trends

Q: What is the climate of Bỉm Sơn?

Bỉm Sơn has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 24.1 °C and it receives 1,571 mm of precipitation per year.

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

The hottest day measured in Bỉm Sơn between 1940 and 2025 was 19 July 1968, reaching 42.8 °C.

Q: What is the coldest day in Bỉm Sơn?

The coldest day measured in Bỉm Sơn between 1940 and 2025 was 12 January 1955, at 2.6 °C.

Q: Does it snow in Bỉm Sơn?

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

Q: Has the climate of Bỉm Sơn warmed?

Yes: Bỉm Sơn warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Bỉm Sơn?

The wettest day measured in Bỉm Sơn between 1940 and 2025 was 24 October 1971, with 243 mm of rain in 24 hours.

Q: What was the windiest day in Bỉm Sơn?

The windiest day measured in Bỉm Sơn between 1940 and 2025 was 27 September 2005, with winds reaching 56.4 km/h.

Q: What is the warmest month in Bỉm Sơn?

The warmest month in Bỉm Sơn is June (29.7 °C on average); the coldest is January (17.2 °C).

Q: How much does it rain in Bỉm Sơn?

Bỉm Sơn receives on average 1,571 mm of precipitation per year, spread over about 153 rainy days.

Q: Is it sunny in Bỉm Sơn?

Bỉm Sơn gets on average 7.3 hours of sunshine per day, roughly 2,665 hours per year over 1940-2025.

Bỉm Sơn (Vietnam) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 24.1 °C and it receives 1,571 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 (29.7 °C on average) and the coldest is January (17.2 °C). Rainfall peaks in August.

Bỉm Sơn averages 0 frost days, 152 hot days (≥ 30 °C) and 153 rainy days per year.

Bỉm Sơn has warmed by +1.0 °C between 1940 and 2025, or +0.11 °C per decade. This trend is statistically significant.

The hottest day of the period reached 42.8 °C (on 19 July 1968) and the coldest 2.6 °C (on 12 January 1955).

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

Bỉm SơnThanh Hóa Province

coords: 20.08°, 105.86°
period: 1940–2025 · 86 yrs

CwaHumid subtropical, dry winterWarmest monthJuneColdest monthJanuaryWettest monthAugustDriest monthDecember

Mean daily temperature

24.1°C

Average daily high

28.0°C

Average daily low

21.3°C

Annual rainfall

1,571mm

Sunshine / day

7.3h

Mean relative humidity

81%

Average peak wind

13.3km/h

Seasonal range

12.5°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

152 d/yr

Rainy days (≥ 1 mm)

153 d/yr

Annual snowfall

0.0 cm

Average feels-like high

31.8 °C

Average feels-like low

24.1 °C

Average peak gust

29.0 km/h

Tropical nights (≥ 20 °C)

231 d/yr

Solar radiation

14.5 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.0 °C

since 1940

+0.1 °C per decade · r² = 0.25 · 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

42.8 °C

19 July 1968

Coldest day

2.6 °C

12 January 1955

Wettest day

243 mm

24 October 1971

Windiest day

56.4 km/h

27 September 2005

Strongest gust

114.1 km/h

27 September 2005

Hottest feels-like

48.8 °C

14 May 1969

Coldest feels-like

-0.6 °C

12 January 1955

Sunniest day

13.0 h

17 June 1954

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	38.9 °C1 June 2025	8.2 °C13 January 2025	24.6 °C	2,381 mm	152
2024	40.0 °C27 April 2024	8.9 °C24 January 2024	25.4 °C	1,965 mm	188
2023	39.7 °C17 May 2023	8.0 °C30 January 2023	25.3 °C	1,348 mm	173
2022	37.9 °C19 June 2022	8.4 °C20 February 2022	24.5 °C	1,747 mm	154
2021	41.2 °C3 June 2021	8.1 °C2 January 2021	25.1 °C	1,410 mm	168
2020	40.5 °C21 May 2020	10.8 °C31 December 2020	25.2 °C	1,661 mm	154
2019	40.0 °C19 May 2019	9.5 °C10 December 2019	25.6 °C	1,541 mm	175
2018	39.2 °C2 July 2018	9.5 °C30 January 2018	24.7 °C	2,041 mm	150
2017	40.9 °C4 June 2017	10.7 °C18 December 2017	24.7 °C	1,606 mm	150
2016	38.9 °C14 June 2016	6.0 °C24 January 2016	24.9 °C	1,602 mm	182
2015	41.0 °C29 May 2015	9.0 °C15 January 2015	25.4 °C	1,638 mm	179
2014	39.9 °C22 May 2014	6.9 °C23 January 2014	24.5 °C	1,623 mm	165
2013	38.8 °C16 May 2013	7.1 °C20 December 2013	24.2 °C	2,100 mm	150
2012	39.2 °C3 May 2012	9.4 °C5 January 2012	24.4 °C	1,681 mm	170
2011	38.8 °C7 July 2011	8.0 °C11 January 2011	23.2 °C	1,801 mm	127
2010	41.4 °C7 July 2010	10.0 °C27 December 2010	25.0 °C	1,824 mm	167
2009	39.0 °C19 April 2009	7.0 °C11 January 2009	24.7 °C	1,531 mm	168
2008	37.3 °C8 April 2008	7.1 °C2 February 2008	23.6 °C	1,579 mm	163
2007	40.0 °C9 June 2007	7.6 °C29 January 2007	24.4 °C	1,344 mm	150
2006	38.5 °C7 June 2006	10.1 °C23 December 2006	24.6 °C	1,159 mm	167
2005	39.1 °C27 May 2005	8.4 °C2 January 2005	24.2 °C	1,575 mm	165
2004	38.5 °C3 July 2004	7.6 °C9 February 2004	23.9 °C	1,286 mm	149
2003	39.9 °C7 May 2003	8.3 °C7 January 2003	24.9 °C	1,226 mm	179
2002	37.6 °C21 May 2002	7.8 °C27 December 2002	24.3 °C	1,365 mm	163
2001	37.5 °C21 April 2001	7.8 °C24 December 2001	24.0 °C	1,709 mm	142
2000	37.0 °C26 May 2000	9.4 °C2 February 2000	24.0 °C	1,503 mm	145
1999	36.4 °C10 July 1999	4.5 °C24 December 1999	24.2 °C	1,490 mm	158
1998	38.6 °C24 April 1998	10.6 °C5 February 1998	25.2 °C	1,038 mm	172
1997	39.2 °C8 June 1997	9.8 °C12 January 1997	24.4 °C	1,602 mm	154
1996	37.9 °C10 July 1996	6.0 °C21 February 1996	23.7 °C	2,037 mm	147
1995	37.6 °C21 May 1995	7.7 °C31 December 1995	23.8 °C	1,405 mm	150
1994	39.7 °C3 May 1994	10.6 °C21 January 1994	24.2 °C	2,058 mm	138
1993	38.0 °C4 June 1993	5.9 °C31 January 1993	24.1 °C	1,618 mm	153
1992	40.4 °C8 May 1992	8.3 °C15 January 1992	23.8 °C	1,423 mm	149
1991	37.9 °C23 May 1991	7.1 °C28 December 1991	24.6 °C	1,109 mm	163
1990	38.8 °C22 April 1990	9.8 °C1 February 1990	24.3 °C	1,643 mm	155
1989	37.8 °C11 May 1989	9.0 °C12 February 1989	23.8 °C	1,869 mm	146
1988	40.4 °C24 May 1988	8.7 °C19 February 1988	24.1 °C	1,408 mm	149
1987	38.9 °C21 May 1987	7.0 °C8 December 1987	24.9 °C	1,535 mm	178
1986	38.4 °C2 July 1986	7.0 °C1 March 1986	23.8 °C	1,658 mm	146
1985	38.6 °C27 May 1985	8.4 °C24 December 1985	23.5 °C	1,864 mm	141
1984	38.8 °C4 April 1984	6.5 °C9 January 1984	23.6 °C	1,383 mm	144
1983	39.8 °C19 June 1983	6.1 °C23 January 1983	23.9 °C	1,539 mm	172
1982	39.6 °C12 May 1982	4.7 °C28 December 1982	24.0 °C	1,700 mm	149
1981	37.6 °C25 August 1981	6.8 °C21 December 1981	24.2 °C	1,947 mm	163
1980	38.9 °C31 May 1980	7.6 °C9 February 1980	24.2 °C	1,709 mm	151
1979	37.6 °C17 July 1979	10.1 °C1 February 1979	24.2 °C	1,480 mm	161
1978	38.0 °C25 June 1978	8.5 °C22 January 1978	23.7 °C	1,992 mm	131
1977	38.8 °C9 June 1977	7.1 °C31 January 1977	23.7 °C	1,400 mm	149
1976	37.5 °C11 July 1976	7.2 °C15 January 1976	23.3 °C	1,497 mm	138
1975	37.6 °C30 July 1975	4.4 °C30 December 1975	23.7 °C	1,758 mm	145
1974	41.2 °C16 July 1974	3.1 °C2 January 1974	24.1 °C	1,649 mm	158
1973	41.6 °C8 April 1973	6.3 °C27 December 1973	24.8 °C	2,089 mm	167
1972	40.8 °C10 May 1972	8.1 °C10 January 1972	24.1 °C	1,833 mm	161
1971	41.4 °C18 June 1971	6.7 °C10 January 1971	23.5 °C	1,894 mm	144
1970	39.6 °C9 May 1970	8.8 °C31 January 1970	24.0 °C	1,471 mm	149
1969	42.6 °C23 May 1969	8.2 °C5 December 1969	24.6 °C	1,052 mm	185
1968	42.8 °C19 July 1968	7.3 °C5 January 1968	24.3 °C	1,231 mm	146
1967	41.3 °C6 July 1967	4.6 °C18 January 1967	23.7 °C	1,258 mm	140
1966	39.8 °C12 May 1966	8.5 °C1 January 1966	24.2 °C	1,583 mm	140
1965	38.8 °C14 May 1965	7.9 °C18 December 1965	23.8 °C	1,427 mm	143
1964	39.4 °C31 July 1964	6.3 °C19 December 1964	23.6 °C	1,811 mm	140
1963	37.0 °C18 July 1963	4.6 °C15 January 1963	23.5 °C	1,856 mm	144
1962	37.7 °C29 May 1962	6.4 °C28 January 1962	23.5 °C	1,442 mm	144
1961	38.2 °C13 July 1961	5.0 °C18 January 1961	24.1 °C	1,613 mm	138
1960	38.5 °C4 May 1960	6.1 °C3 January 1960	24.2 °C	1,500 mm	150
1959	39.2 °C18 June 1959	7.3 °C14 January 1959	24.0 °C	1,331 mm	142
1958	39.8 °C24 April 1958	6.5 °C1 February 1958	23.8 °C	1,293 mm	159
1957	42.2 °C14 May 1957	6.6 °C14 February 1957	23.9 °C	1,601 mm	142
1956	38.9 °C19 April 1956	6.9 °C10 January 1956	23.6 °C	1,657 mm	151
1955	39.6 °C16 April 1955	2.6 °C12 January 1955	23.7 °C	1,400 mm	140
1954	42.0 °C18 June 1954	6.7 °C17 December 1954	24.7 °C	1,257 mm	152
1953	39.1 °C14 July 1953	7.9 °C13 December 1953	24.3 °C	1,943 mm	151
1952	39.2 °C11 July 1952	7.0 °C19 February 1952	24.6 °C	1,996 mm	164
1951	39.7 °C10 April 1951	7.8 °C13 January 1951	24.2 °C	1,583 mm	159
1950	40.0 °C21 April 1950	9.9 °C18 December 1950	24.4 °C	1,405 mm	154
1949	42.0 °C14 June 1949	6.6 °C16 January 1949	24.7 °C	1,230 mm	152
1948	40.1 °C30 June 1948	7.1 °C7 January 1948	24.2 °C	1,326 mm	140
1947	39.0 °C6 May 1947	7.7 °C23 February 1947	23.7 °C	1,193 mm	135
1946	42.6 °C23 June 1946	6.6 °C8 January 1946	25.3 °C	801 mm	176
1945	35.8 °C14 July 1945	5.8 °C18 January 1945	22.7 °C	1,283 mm	109
1944	38.4 °C8 April 1944	5.0 °C22 December 1944	23.5 °C	1,466 mm	135
1943	38.0 °C4 June 1943	7.1 °C13 January 1943	23.4 °C	1,349 mm	131
1942	37.0 °C24 May 1942	8.4 °C16 December 1942	23.6 °C	1,559 mm	120
1941	37.5 °C26 April 1941	9.8 °C1 February 1941	23.9 °C	1,744 mm	137
1940	37.4 °C16 May 1940	8.4 °C3 January 1940	23.3 °C	1,615 mm	116

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

28.1 °C

+0.1 °C

Hot days (≥ 30 °C)

152 d/yr

Frost days (< 0 °C)

0 d/yr

Annual rainfall

2381 mm

+810 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	22.2 °C	+1.4 °C	12 mm	-15 mm
Feb	20.6 °C	-1.3 °C	30 mm	+6 mm
Mar	24.4 °C	-0.7 °C	30 mm	-8 mm
Apr	29.0 °C	-0.2 °C	166 mm	+100 mm
May	31.7 °C	-0.8 °C	221 mm	+52 mm
Jun	33.9 °C	+0.2 °C	183 mm	-3 mm
Jul	33.0 °C	-0.7 °C	472 mm	+280 mm
Aug	32.5 °C	+0.2 °C	564 mm	+253 mm
Sep	31.9 °C	+1.2 °C	431 mm	+142 mm
Oct	29.0 °C	+0.8 °C	125 mm	-62 mm
Nov	24.3 °C	-1.0 °C	112 mm	+52 mm
Dec	23.9 °C	+1.9 °C	35 mm	+13 mm

The year's extremes

Hottest day

38.9 °C

1 Jun 2025

Coldest day

8.2 °C

13 Jan 2025

Wettest day

189.5 mm

22 Jul 2025

Windiest day

48.0 km/h

29 Sep 2025

Strongest gust

106.6 km/h

29 Sep 2025

Hottest feels-like

46.1 °C

2 Jun 2025

Coldest feels-like

6.2 °C

13 Jan 2025

Sunniest day

12.5 h

26 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 Bỉm Sơn?

Bỉm Sơn has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 24.1 °C and it receives 1,571 mm of precipitation per year.

What is the hottest day ever recorded in Bỉm Sơn?

The hottest day measured in Bỉm Sơn between 1940 and 2025 was 19 July 1968, reaching 42.8 °C.

What is the coldest day in Bỉm Sơn?

The coldest day measured in Bỉm Sơn between 1940 and 2025 was 12 January 1955, at 2.6 °C.

Does it snow in Bỉm Sơn?

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

Has the climate of Bỉm Sơn warmed?

Yes: Bỉm Sơn warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Bỉm Sơn?

The wettest day measured in Bỉm Sơn between 1940 and 2025 was 24 October 1971, with 243 mm of rain in 24 hours.

What was the windiest day in Bỉm Sơn?

The windiest day measured in Bỉm Sơn between 1940 and 2025 was 27 September 2005, with winds reaching 56.4 km/h.

What is the warmest month in Bỉm Sơn?

The warmest month in Bỉm Sơn is June (29.7 °C on average); the coldest is January (17.2 °C).

How much does it rain in Bỉm Sơn?

Bỉm Sơn receives on average 1,571 mm of precipitation per year, spread over about 153 rainy days.

Is it sunny in Bỉm Sơn?

Bỉm Sơn gets on average 7.3 hours of sunshine per day, roughly 2,665 hours per year over 1940-2025.

Are there tropical nights in Bỉm Sơn?

Yes: Bỉm Sơn has on average 231 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Bỉm Sơn?

In Bỉm Sơn, between 1940 and 2025, the highest apparent temperature reached 48.8 °C on 14 May 1969, and the lowest was -0.6 °C on 12 January 1955.

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