Sơn Tây climate — normals and trends

Q: What is the climate of Sơn Tây?

Sơn Tây has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 24.1 °C and it receives 1,611 mm of precipitation per year.

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

The hottest day measured in Sơn Tây between 1940 and 2025 was 3 June 2017, reaching 41.0 °C.

Q: What is the coldest day in Sơn Tây?

The coldest day measured in Sơn Tây between 1940 and 2025 was 24 December 1999, at 4.7 °C.

Q: Does it snow in Sơn Tây?

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

Q: Has the climate of Sơn Tây warmed?

Yes: Sơn Tây warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Sơn Tây?

The wettest day measured in Sơn Tây between 1940 and 2025 was 1 May 2013, with 192 mm of rain in 24 hours.

Q: What was the windiest day in Sơn Tây?

The windiest day measured in Sơn Tây between 1940 and 2025 was 7 September 2024, with winds reaching 41.4 km/h.

Q: What is the warmest month in Sơn Tây?

The warmest month in Sơn Tây is June (29.3 °C on average); the coldest is January (16.8 °C).

Q: How much does it rain in Sơn Tây?

Sơn Tây receives on average 1,611 mm of precipitation per year, spread over about 169 rainy days.

Q: Is it sunny in Sơn Tây?

Sơn Tây gets on average 6.6 hours of sunshine per day, roughly 2,409 hours per year over 1940-2025.

Sơn Tây (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 1,611 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 (29.3 °C on average) and the coldest is January (16.8 °C). Rainfall peaks in August.

Sơn Tây averages 0 frost days, 155 hot days (≥ 30 °C) and 169 rainy days per year.

Sơn Tây has warmed by +1.3 °C between 1940 and 2025, or +0.15 °C per decade. This trend is statistically significant.

The hottest day of the period reached 41.0 °C (on 3 June 2017) and the coldest 4.7 °C (on 24 December 1999).

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

Sơn TâyHanoi

coords: 21.14°, 105.51°
period: 1940–2025 · 86 yrs

CwaHumid subtropical, dry winterWarmest monthJuneColdest monthJanuaryWettest monthAugustDriest monthDecember

Mean daily temperature

24.1°C

Average daily high

27.7°C

Average daily low

21.3°C

Annual rainfall

1,611mm

Sunshine / day

6.6h

Mean relative humidity

81%

Average peak wind

9.9km/h

Seasonal range

12.5°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

155 d/yr

Rainy days (≥ 1 mm)

169 d/yr

Annual snowfall

0.0 cm

Average feels-like high

31.6 °C

Average feels-like low

24.6 °C

Average peak gust

23.8 km/h

Tropical nights (≥ 20 °C)

233 d/yr

Solar radiation

13.1 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.3 °C

since 1940

+0.2 °C per decade · r² = 0.43 · 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

41.0 °C

3 June 2017

Coldest day

4.7 °C

24 December 1999

Wettest day

192 mm

1 May 2013

Windiest day

41.4 km/h

7 September 2024

Strongest gust

96.5 km/h

23 July 1980

Hottest feels-like

48.2 °C

30 May 2015

Coldest feels-like

2.1 °C

31 December 1973

Sunniest day

13.1 h

13 June 2013

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	39.0 °C1 June 2025	9.6 °C13 January 2025	24.6 °C	1,995 mm	166
2024	39.7 °C27 April 2024	9.3 °C24 January 2024	25.3 °C	2,159 mm	194
2023	39.3 °C17 May 2023	8.5 °C31 January 2023	25.2 °C	1,536 mm	176
2022	38.4 °C4 June 2022	9.4 °C20 December 2022	24.5 °C	1,842 mm	165
2021	40.6 °C3 June 2021	8.8 °C2 January 2021	25.0 °C	1,398 mm	171
2020	39.8 °C21 May 2020	11.1 °C31 January 2020	24.9 °C	1,701 mm	155
2019	39.6 °C19 May 2019	8.6 °C8 December 2019	25.3 °C	1,494 mm	176
2018	39.4 °C4 July 2018	9.6 °C30 January 2018	24.8 °C	1,760 mm	167
2017	41.0 °C3 June 2017	9.8 °C19 December 2017	24.7 °C	1,874 mm	161
2016	38.9 °C2 June 2016	7.0 °C24 January 2016	24.9 °C	1,574 mm	184
2015	39.7 °C28 May 2015	9.9 °C15 January 2015	25.3 °C	1,679 mm	189
2014	40.0 °C22 May 2014	6.6 °C23 January 2014	24.4 °C	1,644 mm	178
2013	38.9 °C16 May 2013	7.6 °C20 December 2013	24.3 °C	1,698 mm	167
2012	39.1 °C1 May 2012	9.3 °C26 January 2012	24.3 °C	1,414 mm	177
2011	37.4 °C7 July 2011	9.0 °C11 January 2011	23.3 °C	1,377 mm	142
2010	38.7 °C19 June 2010	10.1 °C19 February 2010	24.8 °C	1,721 mm	175
2009	38.5 °C8 June 2009	8.1 °C12 January 2009	24.7 °C	1,386 mm	179
2008	38.3 °C8 April 2008	8.0 °C1 February 2008	23.7 °C	1,546 mm	161
2007	38.1 °C1 April 2007	9.4 °C29 January 2007	24.5 °C	1,230 mm	161
2006	38.7 °C11 April 2006	8.8 °C23 December 2006	24.6 °C	1,315 mm	173
2005	38.1 °C13 May 2005	8.5 °C2 January 2005	24.2 °C	1,479 mm	162
2004	38.3 °C3 July 2004	8.3 °C10 February 2004	24.1 °C	1,225 mm	161
2003	40.2 °C6 May 2003	7.4 °C7 January 2003	25.0 °C	1,268 mm	188
2002	38.3 °C21 May 2002	9.7 °C27 December 2002	24.6 °C	1,492 mm	178
2001	37.5 °C20 April 2001	9.1 °C24 December 2001	24.3 °C	1,680 mm	156
2000	37.0 °C18 July 2000	8.5 °C2 February 2000	24.2 °C	1,564 mm	149
1999	36.6 °C20 July 1999	4.7 °C24 December 1999	24.3 °C	1,457 mm	162
1998	39.4 °C15 June 1998	10.3 °C20 January 1998	25.0 °C	1,518 mm	180
1997	39.3 °C8 June 1997	11.1 °C12 January 1997	24.3 °C	1,630 mm	157
1996	39.1 °C6 May 1996	7.8 °C21 February 1996	23.7 °C	1,906 mm	154
1995	38.7 °C21 June 1995	8.2 °C31 December 1995	23.8 °C	1,522 mm	160
1994	40.0 °C2 May 1994	10.7 °C24 January 1994	24.3 °C	1,988 mm	141
1993	37.8 °C1 June 1993	7.6 °C31 January 1993	24.1 °C	1,353 mm	162
1992	37.6 °C4 July 1992	9.5 °C15 January 1992	23.8 °C	1,587 mm	151
1991	37.8 °C24 May 1991	9.9 °C28 December 1991	24.5 °C	1,314 mm	162
1990	39.0 °C22 April 1990	9.2 °C2 February 1990	24.3 °C	1,851 mm	147
1989	37.8 °C18 June 1989	9.7 °C4 February 1989	23.8 °C	1,805 mm	152
1988	39.6 °C21 May 1988	8.8 °C20 February 1988	23.8 °C	1,418 mm	148
1987	39.4 °C21 May 1987	8.2 °C8 December 1987	25.0 °C	1,656 mm	179
1986	38.4 °C2 July 1986	7.2 °C3 March 1986	23.9 °C	1,863 mm	147
1985	38.9 °C27 May 1985	9.1 °C24 December 1985	23.6 °C	1,674 mm	167
1984	38.1 °C14 June 1984	7.6 °C10 January 1984	23.5 °C	1,524 mm	145
1983	39.7 °C19 June 1983	7.9 °C29 December 1983	23.8 °C	1,581 mm	173
1982	38.6 °C21 June 1982	7.0 °C27 December 1982	24.0 °C	1,740 mm	146
1981	38.0 °C25 August 1981	9.1 °C12 January 1981	24.3 °C	2,001 mm	168
1980	38.6 °C31 May 1980	8.4 °C8 February 1980	24.2 °C	1,994 mm	159
1979	37.5 °C15 July 1979	10.7 °C16 January 1979	24.2 °C	1,586 mm	171
1978	37.7 °C25 June 1978	9.1 °C21 January 1978	23.7 °C	2,224 mm	142
1977	39.0 °C30 May 1977	6.9 °C31 January 1977	23.8 °C	1,401 mm	158
1976	37.4 °C16 June 1976	7.4 °C1 January 1976	23.4 °C	1,581 mm	140
1975	37.1 °C30 July 1975	5.8 °C18 December 1975	23.8 °C	2,288 mm	156
1974	38.3 °C8 May 1974	4.9 °C1 January 1974	23.8 °C	1,679 mm	163
1973	39.5 °C20 May 1973	4.9 °C31 December 1973	24.6 °C	2,040 mm	167
1972	40.3 °C10 May 1972	8.6 °C16 January 1972	24.1 °C	2,049 mm	176
1971	37.5 °C4 June 1971	6.3 °C5 January 1971	23.5 °C	1,943 mm	146
1970	37.9 °C9 May 1970	9.0 °C31 January 1970	23.8 °C	1,512 mm	148
1969	39.5 °C13 May 1969	9.3 °C11 December 1969	24.2 °C	1,346 mm	184
1968	37.8 °C24 May 1968	6.2 °C14 February 1968	24.0 °C	1,588 mm	145
1967	39.4 °C6 July 1967	5.5 °C17 January 1967	23.7 °C	1,320 mm	149
1966	38.0 °C12 May 1966	8.4 °C1 January 1966	23.7 °C	1,483 mm	124
1965	36.7 °C14 May 1965	8.1 °C18 December 1965	23.5 °C	1,448 mm	130
1964	38.4 °C18 June 1964	7.4 °C19 December 1964	23.6 °C	2,030 mm	145
1963	36.1 °C10 July 1963	5.9 °C16 January 1963	23.7 °C	1,683 mm	147
1962	38.0 °C28 May 1962	7.6 °C28 January 1962	23.7 °C	1,274 mm	154
1961	38.2 °C1 June 1961	6.0 °C19 January 1961	24.1 °C	1,772 mm	153
1960	38.4 °C5 May 1960	8.0 °C2 January 1960	24.1 °C	1,754 mm	151
1959	38.3 °C12 June 1959	9.5 °C12 January 1959	24.0 °C	1,488 mm	157
1958	40.4 °C10 May 1958	7.6 °C1 February 1958	24.0 °C	1,420 mm	169
1957	39.6 °C12 May 1957	6.6 °C14 February 1957	23.9 °C	1,652 mm	153
1956	37.4 °C4 September 1956	8.1 °C9 January 1956	23.4 °C	1,653 mm	152
1955	38.4 °C16 April 1955	5.5 °C12 January 1955	23.5 °C	1,436 mm	141
1954	39.5 °C18 June 1954	8.7 °C17 December 1954	24.2 °C	1,256 mm	150
1953	38.5 °C26 June 1953	11.0 °C13 December 1953	24.1 °C	1,632 mm	150
1952	38.3 °C10 April 1952	7.2 °C19 February 1952	24.3 °C	1,870 mm	141
1951	36.0 °C17 May 1951	8.3 °C14 January 1951	23.7 °C	1,759 mm	140
1950	37.4 °C21 April 1950	9.9 °C17 February 1950	23.9 °C	1,652 mm	145
1949	40.8 °C14 June 1949	5.8 °C10 January 1949	24.4 °C	1,325 mm	150
1948	35.9 °C15 June 1948	7.2 °C3 January 1948	23.7 °C	1,401 mm	128
1947	37.0 °C14 June 1947	8.0 °C30 December 1947	23.4 °C	1,290 mm	121
1946	40.7 °C31 July 1946	8.8 °C11 January 1946	25.0 °C	848 mm	169
1945	35.7 °C13 July 1945	7.5 °C9 February 1945	22.4 °C	1,471 mm	102
1944	37.6 °C8 April 1944	5.8 °C20 December 1944	23.3 °C	1,612 mm	119
1943	36.2 °C18 June 1943	7.2 °C13 January 1943	23.0 °C	1,331 mm	104
1942	36.3 °C24 May 1942	9.0 °C13 February 1942	23.3 °C	1,801 mm	101
1941	35.1 °C26 April 1941	10.0 °C4 February 1941	23.5 °C	1,690 mm	120
1940	36.0 °C15 May 1940	7.6 °C26 January 1940	23.1 °C	1,492 mm	107

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

+0.5 °C

Hot days (≥ 30 °C)

166 d/yr

+11

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1995 mm

+384 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	22.4 °C	+2.3 °C	13 mm	-22 mm
Feb	19.5 °C	-1.9 °C	50 mm	+12 mm
Mar	25.0 °C	+0.1 °C	29 mm	-22 mm
Apr	29.7 °C	+0.7 °C	89 mm	-3 mm
May	31.3 °C	-0.6 °C	276 mm	+78 mm
Jun	33.3 °C	+0.3 °C	337 mm	+109 mm
Jul	33.6 °C	+0.5 °C	291 mm	+65 mm
Aug	32.7 °C	+0.4 °C	312 mm	-0 mm
Sep	32.5 °C	+1.3 °C	306 mm	+79 mm
Oct	29.6 °C	+0.9 °C	183 mm	+50 mm
Nov	24.5 °C	-0.8 °C	77 mm	+30 mm
Dec	23.4 °C	+1.8 °C	33 mm	+8 mm

The year's extremes

Hottest day

39.0 °C

1 Jun 2025

Coldest day

9.6 °C

13 Jan 2025

Wettest day

98.6 mm

29 Sep 2025

Windiest day

28.1 km/h

29 Sep 2025

Strongest gust

76.0 km/h

29 Sep 2025

Hottest feels-like

45.6 °C

2 Jun 2025

Coldest feels-like

8.7 °C

13 Jan 2025

Sunniest day

12.5 h

1 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 Sơn Tây?

Sơn Tây has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 24.1 °C and it receives 1,611 mm of precipitation per year.

What is the hottest day ever recorded in Sơn Tây?

The hottest day measured in Sơn Tây between 1940 and 2025 was 3 June 2017, reaching 41.0 °C.

What is the coldest day in Sơn Tây?

The coldest day measured in Sơn Tây between 1940 and 2025 was 24 December 1999, at 4.7 °C.

Does it snow in Sơn Tây?

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

Has the climate of Sơn Tây warmed?

Yes: Sơn Tây warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Sơn Tây?

The wettest day measured in Sơn Tây between 1940 and 2025 was 1 May 2013, with 192 mm of rain in 24 hours.

What was the windiest day in Sơn Tây?

The windiest day measured in Sơn Tây between 1940 and 2025 was 7 September 2024, with winds reaching 41.4 km/h.

What is the warmest month in Sơn Tây?

The warmest month in Sơn Tây is June (29.3 °C on average); the coldest is January (16.8 °C).

How much does it rain in Sơn Tây?

Sơn Tây receives on average 1,611 mm of precipitation per year, spread over about 169 rainy days.

Is it sunny in Sơn Tây?

Sơn Tây gets on average 6.6 hours of sunshine per day, roughly 2,409 hours per year over 1940-2025.

Are there tropical nights in Sơn Tây?

Yes: Sơn Tây has on average 233 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Sơn Tây?

In Sơn Tây, between 1940 and 2025, the highest apparent temperature reached 48.2 °C on 30 May 2015, and the lowest was 2.1 °C on 31 December 1973.

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