Cổ Đô climate — normals and trends

Q: What is the climate of Cổ Đô?

Cổ Đô has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 23.4 °C and it receives 1,872 mm of precipitation per year.

Q: What is the hottest day ever recorded in Cổ Đô?

The hottest day measured in Cổ Đô between 1940 and 2025 was 3 June 2017, reaching 40.7 °C.

Q: What is the coldest day in Cổ Đô?

The coldest day measured in Cổ Đô between 1940 and 2025 was 2 January 1974, at 2.8 °C.

Q: Does it snow in Cổ Đô?

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

Q: Has the climate of Cổ Đô warmed?

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

Q: What is the wettest day in Cổ Đô?

The wettest day measured in Cổ Đô between 1940 and 2025 was 18 June 1941, with 205 mm of rain in 24 hours.

Q: What was the windiest day in Cổ Đô?

The windiest day measured in Cổ Đô between 1940 and 2025 was 23 July 1980, with winds reaching 37.2 km/h.

Q: What is the warmest month in Cổ Đô?

The warmest month in Cổ Đô is June (28.7 °C on average); the coldest is January (16.1 °C).

Q: How much does it rain in Cổ Đô?

Cổ Đô receives on average 1,872 mm of precipitation per year, spread over about 179 rainy days.

Q: Is it sunny in Cổ Đô?

Cổ Đô gets on average 6.7 hours of sunshine per day, roughly 2,446 hours per year over 1940-2025.

Cổ Đô (Vietnam) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 23.4 °C and it receives 1,872 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 (28.7 °C on average) and the coldest is January (16.1 °C). Rainfall peaks in August.

Cổ Đô averages 0 frost days, 138 hot days (≥ 30 °C) and 179 rainy days per year.

Cổ Đô 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 40.7 °C (on 3 June 2017) and the coldest 2.8 °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

Cổ ĐôHanoi

coords: 21.28°, 105.36°
period: 1940–2025 · 86 yrs

CwaHumid subtropical, dry winterWarmest monthJuneColdest monthJanuaryWettest monthAugustDriest monthDecember

Mean daily temperature

23.4°C

Average daily high

27.1°C

Average daily low

20.6°C

Annual rainfall

1,872mm

Sunshine / day

6.7h

Mean relative humidity

83%

Average peak wind

9.2km/h

Seasonal range

12.6°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

138 d/yr

Rainy days (≥ 1 mm)

179 d/yr

Annual snowfall

0.0 cm

Average feels-like high

31.0 °C

Average feels-like low

23.8 °C

Average peak gust

24.3 km/h

Tropical nights (≥ 20 °C)

220 d/yr

Solar radiation

13.2 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.3 °C

since 1940

+0.2 °C per decade · r² = 0.44 · 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

40.7 °C

3 June 2017

Coldest day

2.8 °C

2 January 1974

Wettest day

205 mm

18 June 1941

Windiest day

37.2 km/h

23 July 1980

Strongest gust

103.7 km/h

23 July 1980

Hottest feels-like

47.4 °C

30 May 2015

Coldest feels-like

0.4 °C

2 January 1974

Sunniest day

13.2 h

17 June 1954

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	39.2 °C2 June 2025	8.3 °C13 January 2025	24.0 °C	2,302 mm	152
2024	40.6 °C27 April 2024	8.7 °C24 January 2024	24.7 °C	2,375 mm	176
2023	39.4 °C6 May 2023	8.3 °C31 January 2023	24.6 °C	1,729 mm	165
2022	37.8 °C4 June 2022	9.3 °C21 February 2022	23.9 °C	2,078 mm	150
2021	40.5 °C3 June 2021	8.0 °C2 January 2021	24.4 °C	1,734 mm	166
2020	40.4 °C21 May 2020	10.8 °C31 January 2020	24.2 °C	2,045 mm	143
2019	39.9 °C18 May 2019	8.1 °C10 December 2019	24.7 °C	1,763 mm	161
2018	38.6 °C4 July 2018	9.0 °C30 January 2018	24.2 °C	2,197 mm	151
2017	40.7 °C3 June 2017	9.3 °C19 December 2017	24.1 °C	2,144 mm	141
2016	38.5 °C2 June 2016	6.5 °C24 January 2016	24.3 °C	1,815 mm	166
2015	40.0 °C29 May 2015	8.9 °C15 January 2015	24.7 °C	1,843 mm	176
2014	40.2 °C22 May 2014	6.1 °C23 January 2014	23.8 °C	1,888 mm	160
2013	38.4 °C16 May 2013	7.0 °C20 December 2013	23.7 °C	1,943 mm	150
2012	39.3 °C1 May 2012	8.8 °C26 January 2012	23.7 °C	1,731 mm	157
2011	37.4 °C7 July 2011	8.6 °C16 January 2011	22.7 °C	1,547 mm	124
2010	38.9 °C19 June 2010	9.3 °C19 February 2010	24.2 °C	2,102 mm	155
2009	38.2 °C8 June 2009	7.9 °C12 January 2009	24.1 °C	1,562 mm	163
2008	38.1 °C8 April 2008	7.3 °C2 February 2008	23.1 °C	1,827 mm	141
2007	37.6 °C1 April 2007	6.9 °C29 January 2007	23.9 °C	1,543 mm	143
2006	40.2 °C11 April 2006	7.2 °C23 December 2006	23.9 °C	1,534 mm	150
2005	37.8 °C1 May 2005	7.5 °C3 January 2005	23.5 °C	1,717 mm	149
2004	38.0 °C3 July 2004	7.2 °C9 February 2004	23.5 °C	1,481 mm	137
2003	39.6 °C6 May 2003	7.1 °C7 January 2003	24.4 °C	1,426 mm	170
2002	38.3 °C1 June 2002	9.4 °C27 December 2002	24.0 °C	1,753 mm	158
2001	37.7 °C20 April 2001	7.8 °C24 December 2001	23.7 °C	1,794 mm	132
2000	36.9 °C26 May 2000	7.7 °C2 February 2000	23.5 °C	1,784 mm	130
1999	36.6 °C20 July 1999	4.4 °C24 December 1999	23.7 °C	1,600 mm	146
1998	38.9 °C15 June 1998	9.9 °C20 January 1998	24.4 °C	1,490 mm	167
1997	38.7 °C8 June 1997	10.4 °C12 January 1997	23.7 °C	1,982 mm	132
1996	38.4 °C6 May 1996	7.0 °C1 January 1996	23.1 °C	2,351 mm	137
1995	38.8 °C20 May 1995	6.3 °C31 December 1995	23.2 °C	1,742 mm	139
1994	39.3 °C2 May 1994	10.1 °C22 January 1994	23.7 °C	2,448 mm	125
1993	37.5 °C1 June 1993	5.8 °C31 January 1993	23.5 °C	1,555 mm	145
1992	37.3 °C21 April 1992	8.9 °C17 January 1992	23.2 °C	1,814 mm	133
1991	37.2 °C24 May 1991	9.3 °C30 December 1991	23.9 °C	1,575 mm	147
1990	39.4 °C22 April 1990	8.3 °C2 February 1990	23.7 °C	2,181 mm	132
1989	37.8 °C18 June 1989	9.0 °C5 February 1989	23.2 °C	2,061 mm	135
1988	39.3 °C24 May 1988	8.0 °C20 February 1988	23.2 °C	1,744 mm	139
1987	39.5 °C21 May 1987	7.5 °C8 December 1987	24.3 °C	1,894 mm	162
1986	38.7 °C2 July 1986	6.6 °C11 January 1986	23.3 °C	2,083 mm	134
1985	38.0 °C27 May 1985	8.6 °C25 December 1985	23.0 °C	2,000 mm	147
1984	39.0 °C4 April 1984	7.5 °C9 January 1984	22.9 °C	1,714 mm	132
1983	39.2 °C19 June 1983	6.8 °C24 January 1983	23.2 °C	1,951 mm	157
1982	39.1 °C12 May 1982	4.3 °C27 December 1982	23.4 °C	1,924 mm	129
1981	37.8 °C25 August 1981	7.6 °C21 December 1981	23.7 °C	2,330 mm	154
1980	38.2 °C31 May 1980	7.9 °C8 February 1980	23.5 °C	2,232 mm	135
1979	37.3 °C15 July 1979	9.9 °C16 January 1979	23.5 °C	1,810 mm	145
1978	37.7 °C25 June 1978	8.4 °C21 January 1978	23.1 °C	2,574 mm	132
1977	38.6 °C31 May 1977	6.2 °C31 January 1977	23.1 °C	1,684 mm	142
1976	37.1 °C16 June 1976	5.8 °C1 January 1976	22.8 °C	1,772 mm	127
1975	37.3 °C3 July 1975	3.1 °C31 December 1975	23.2 °C	2,442 mm	143
1974	38.3 °C8 May 1974	2.8 °C2 January 1974	23.1 °C	2,014 mm	143
1973	39.1 °C23 June 1973	4.9 °C31 December 1973	24.0 °C	2,338 mm	147
1972	39.9 °C10 May 1972	8.1 °C10 January 1972	23.5 °C	2,274 mm	163
1971	37.2 °C18 June 1971	4.8 °C5 January 1971	22.8 °C	2,229 mm	125
1970	37.7 °C9 May 1970	9.2 °C31 January 1970	23.1 °C	1,868 mm	128
1969	39.2 °C13 May 1969	7.7 °C11 December 1969	23.5 °C	1,627 mm	166
1968	37.6 °C2 July 1968	5.4 °C14 February 1968	23.4 °C	1,840 mm	135
1967	38.3 °C6 July 1967	5.0 °C19 January 1967	23.0 °C	1,543 mm	135
1966	38.5 °C12 May 1966	7.0 °C3 December 1966	23.0 °C	1,657 mm	99
1965	36.7 °C14 May 1965	7.4 °C18 December 1965	22.9 °C	1,705 mm	107
1964	37.3 °C19 May 1964	6.0 °C19 December 1964	23.0 °C	2,290 mm	130
1963	36.1 °C13 May 1963	5.2 °C15 January 1963	23.1 °C	2,010 mm	132
1962	38.1 °C27 May 1962	6.8 °C4 January 1962	23.1 °C	1,559 mm	137
1961	37.5 °C1 June 1961	4.9 °C17 January 1961	23.5 °C	2,026 mm	146
1960	38.5 °C5 May 1960	6.3 °C3 January 1960	23.5 °C	1,957 mm	142
1959	37.6 °C12 June 1959	7.8 °C14 January 1959	23.4 °C	1,654 mm	138
1958	40.4 °C23 April 1958	7.0 °C1 February 1958	23.3 °C	1,626 mm	148
1957	40.0 °C13 May 1957	4.9 °C14 February 1957	23.3 °C	2,192 mm	138
1956	37.1 °C4 September 1956	6.5 °C11 January 1956	22.8 °C	2,011 mm	131
1955	38.6 °C16 April 1955	5.5 °C12 January 1955	22.9 °C	1,660 mm	117
1954	39.1 °C18 June 1954	6.4 °C17 December 1954	23.7 °C	1,415 mm	134
1953	38.2 °C21 May 1953	9.0 °C13 December 1953	23.5 °C	1,886 mm	135
1952	38.7 °C10 April 1952	6.5 °C19 February 1952	23.8 °C	2,010 mm	127
1951	35.7 °C17 May 1951	8.0 °C14 January 1951	23.1 °C	2,108 mm	119
1950	38.9 °C21 April 1950	9.2 °C19 February 1950	23.3 °C	1,794 mm	130
1949	40.4 °C14 June 1949	5.8 °C10 January 1949	23.8 °C	1,534 mm	128
1948	35.7 °C30 June 1948	6.7 °C4 January 1948	23.1 °C	1,589 mm	115
1947	36.6 °C14 June 1947	6.9 °C30 December 1947	22.8 °C	1,541 mm	93
1946	40.2 °C31 July 1946	7.4 °C13 January 1946	24.3 °C	1,064 mm	161
1945	35.7 °C13 July 1945	6.5 °C18 January 1945	21.7 °C	1,737 mm	79
1944	37.6 °C8 April 1944	3.9 °C21 December 1944	22.6 °C	1,877 mm	97
1943	35.7 °C18 June 1943	6.5 °C13 January 1943	22.4 °C	1,651 mm	83
1942	36.5 °C24 May 1942	7.7 °C7 December 1942	22.6 °C	2,088 mm	76
1941	34.9 °C12 July 1941	8.1 °C3 February 1941	22.9 °C	2,183 mm	99
1940	35.7 °C16 May 1940	7.8 °C26 January 1940	22.5 °C	1,861 mm	87

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

27.5 °C

+0.4 °C

Hot days (≥ 30 °C)

152 d/yr

+14

Frost days (< 0 °C)

0 d/yr

Annual rainfall

2302 mm

+430 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	21.6 °C	+2.2 °C	15 mm	-28 mm
Feb	18.9 °C	-1.9 °C	62 mm	+17 mm
Mar	24.3 °C	-0.1 °C	42 mm	-22 mm
Apr	29.0 °C	+0.4 °C	102 mm	-11 mm
May	30.7 °C	-0.7 °C	303 mm	+73 mm
Jun	32.8 °C	+0.3 °C	383 mm	+128 mm
Jul	33.2 °C	+0.7 °C	365 mm	+101 mm
Aug	32.2 °C	+0.5 °C	377 mm	+31 mm
Sep	31.8 °C	+1.3 °C	369 mm	+107 mm
Oct	28.9 °C	+0.9 °C	142 mm	-16 mm
Nov	23.8 °C	-0.8 °C	97 mm	+37 mm
Dec	22.6 °C	+1.7 °C	45 mm	+12 mm

The year's extremes

Hottest day

39.2 °C

2 Jun 2025

Coldest day

8.3 °C

13 Jan 2025

Wettest day

124.3 mm

29 Sep 2025

Windiest day

28.7 km/h

29 Sep 2025

Strongest gust

82.8 km/h

29 Sep 2025

Hottest feels-like

45.7 °C

2 Jun 2025

Coldest feels-like

7.2 °C

13 Jan 2025

Sunniest day

12.6 h

14 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 Cổ Đô?

Cổ Đô has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 23.4 °C and it receives 1,872 mm of precipitation per year.

What is the hottest day ever recorded in Cổ Đô?

The hottest day measured in Cổ Đô between 1940 and 2025 was 3 June 2017, reaching 40.7 °C.

What is the coldest day in Cổ Đô?

The coldest day measured in Cổ Đô between 1940 and 2025 was 2 January 1974, at 2.8 °C.

Does it snow in Cổ Đô?

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

Has the climate of Cổ Đô warmed?

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

What is the wettest day in Cổ Đô?

The wettest day measured in Cổ Đô between 1940 and 2025 was 18 June 1941, with 205 mm of rain in 24 hours.

What was the windiest day in Cổ Đô?

The windiest day measured in Cổ Đô between 1940 and 2025 was 23 July 1980, with winds reaching 37.2 km/h.

What is the warmest month in Cổ Đô?

The warmest month in Cổ Đô is June (28.7 °C on average); the coldest is January (16.1 °C).

How much does it rain in Cổ Đô?

Cổ Đô receives on average 1,872 mm of precipitation per year, spread over about 179 rainy days.

Is it sunny in Cổ Đô?

Cổ Đô gets on average 6.7 hours of sunshine per day, roughly 2,446 hours per year over 1940-2025.

Are there tropical nights in Cổ Đô?

Yes: Cổ Đô has on average 220 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Cổ Đô?

In Cổ Đô, between 1940 and 2025, the highest apparent temperature reached 47.4 °C on 30 May 2015, and the lowest was 0.4 °C on 2 January 1974.

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