Diễn Thành climate — normals and trends

Q: What is the climate of Diễn Thành?

Diễn Thành has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 24.7 °C and it receives 1,413 mm of precipitation per year.

Q: What is the hottest day ever recorded in Diễn Thành?

The hottest day measured in Diễn Thành between 1940 and 2025 was 29 May 2015, reaching 42.7 °C.

Q: What is the coldest day in Diễn Thành?

The coldest day measured in Diễn Thành between 1940 and 2025 was 12 January 1955, at 3.5 °C.

Q: Does it snow in Diễn Thành?

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

Q: Has the climate of Diễn Thành warmed?

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

Q: What is the wettest day in Diễn Thành?

The wettest day measured in Diễn Thành between 1940 and 2025 was 31 October 1952, with 352 mm of rain in 24 hours.

Q: What was the windiest day in Diễn Thành?

The windiest day measured in Diễn Thành between 1940 and 2025 was 1 September 1956, with winds reaching 59.1 km/h.

Q: What is the warmest month in Diễn Thành?

The warmest month in Diễn Thành is July (30.4 °C on average); the coldest is January (18.0 °C).

Q: How much does it rain in Diễn Thành?

Diễn Thành receives on average 1,413 mm of precipitation per year, spread over about 136 rainy days.

Q: Is it sunny in Diễn Thành?

Diễn Thành gets on average 7.8 hours of sunshine per day, roughly 2,847 hours per year over 1940-2025.

Diễn Thành (Vietnam) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 24.7 °C and it receives 1,413 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 July (30.4 °C on average) and the coldest is January (18.0 °C). Rainfall peaks in September.

Diễn Thành averages 0 frost days, 160 hot days (≥ 30 °C) and 136 rainy days per year.

Diễn Thành has warmed by +1.0 °C between 1940 and 2025, or +0.12 °C per decade. This trend is statistically significant.

The hottest day of the period reached 42.7 °C (on 29 May 2015) and the coldest 3.5 °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

Diễn ThànhNghệ An Province

coords: 18.98°, 105.60°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthJulyColdest monthJanuaryWettest monthSeptemberDriest monthFebruary

Mean daily temperature

24.7°C

Average daily high

28.5°C

Average daily low

21.8°C

Annual rainfall

1,413mm

Sunshine / day

7.8h

Mean relative humidity

79%

Average peak wind

14.1km/h

Seasonal range

12.4°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

160 d/yr

Rainy days (≥ 1 mm)

136 d/yr

Annual snowfall

0.0 cm

Average feels-like high

32.3 °C

Average feels-like low

24.6 °C

Average peak gust

31.4 km/h

Tropical nights (≥ 20 °C)

240 d/yr

Solar radiation

15.3 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

42.7 °C

29 May 2015

Coldest day

3.5 °C

12 January 1955

Wettest day

352 mm

31 October 1952

Windiest day

59.1 km/h

1 September 1956

Strongest gust

120.2 km/h

29 September 2025

Hottest feels-like

48.1 °C

22 June 2019

Coldest feels-like

0.3 °C

12 January 1955

Sunniest day

12.9 h

17 June 1954

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	37.9 °C9 May 2025	8.6 °C13 January 2025	25.0 °C	2,089 mm	170
2024	40.8 °C30 April 2024	9.8 °C24 January 2024	25.8 °C	1,904 mm	195
2023	40.9 °C12 July 2023	7.7 °C30 January 2023	26.1 °C	1,147 mm	183
2022	40.9 °C29 June 2022	9.4 °C21 February 2022	25.2 °C	1,522 mm	157
2021	39.9 °C3 June 2021	8.3 °C13 January 2021	25.5 °C	1,662 mm	163
2020	41.8 °C24 June 2020	12.5 °C31 January 2020	26.0 °C	1,617 mm	166
2019	42.0 °C22 June 2019	10.5 °C10 December 2019	26.4 °C	1,323 mm	185
2018	41.8 °C1 July 2018	10.7 °C7 February 2018	25.4 °C	1,738 mm	165
2017	39.9 °C4 June 2017	11.6 °C19 December 2017	25.4 °C	1,477 mm	171
2016	41.5 °C17 July 2016	6.4 °C24 January 2016	25.7 °C	1,464 mm	192
2015	42.7 °C29 May 2015	10.2 °C14 January 2015	26.2 °C	1,033 mm	186
2014	40.4 °C4 June 2014	9.0 °C23 January 2014	25.2 °C	1,019 mm	164
2013	40.9 °C8 June 2013	8.8 °C20 December 2013	24.8 °C	1,966 mm	159
2012	39.6 °C4 May 2012	10.6 °C26 January 2012	25.1 °C	1,216 mm	166
2011	38.9 °C16 June 2011	8.6 °C11 January 2011	23.6 °C	1,740 mm	126
2010	41.7 °C19 June 2010	11.3 °C19 February 2010	25.6 °C	1,880 mm	177
2009	37.9 °C19 April 2009	8.1 °C11 January 2009	25.1 °C	1,147 mm	179
2008	38.1 °C16 August 2008	8.4 °C2 February 2008	24.2 °C	1,626 mm	159
2007	41.7 °C9 June 2007	8.5 °C29 January 2007	25.1 °C	1,403 mm	155
2006	41.2 °C14 June 2006	10.8 °C8 January 2006	25.3 °C	1,093 mm	178
2005	39.8 °C20 July 2005	8.8 °C1 January 2005	24.8 °C	1,507 mm	163
2004	38.6 °C3 July 2004	9.3 °C9 February 2004	24.3 °C	1,211 mm	140
2003	39.4 °C7 May 2003	9.4 °C12 January 2003	25.2 °C	1,138 mm	169
2002	37.1 °C22 May 2002	9.7 °C27 December 2002	24.7 °C	1,377 mm	163
2001	37.6 °C9 May 2001	10.2 °C24 December 2001	24.5 °C	1,676 mm	154
2000	37.0 °C13 August 2000	10.4 °C1 February 2000	24.4 °C	1,487 mm	146
1999	39.8 °C23 July 1999	6.3 °C24 December 1999	24.7 °C	1,057 mm	161
1998	41.7 °C16 June 1998	11.1 °C5 February 1998	25.8 °C	855 mm	183
1997	39.1 °C9 June 1997	11.4 °C12 January 1997	24.9 °C	1,240 mm	172
1996	38.6 °C10 July 1996	6.9 °C21 February 1996	24.2 °C	1,964 mm	147
1995	40.1 °C24 June 1995	8.7 °C31 December 1995	24.4 °C	1,361 mm	149
1994	39.6 °C3 May 1994	10.3 °C24 January 1994	24.7 °C	1,446 mm	154
1993	40.4 °C22 June 1993	6.7 °C31 January 1993	24.8 °C	1,042 mm	163
1992	40.9 °C24 June 1992	10.3 °C15 January 1992	24.3 °C	1,318 mm	151
1991	39.5 °C15 June 1991	8.2 °C28 December 1991	25.1 °C	1,228 mm	170
1990	40.6 °C21 August 1990	10.4 °C1 February 1990	24.9 °C	1,460 mm	162
1989	38.5 °C21 April 1989	10.3 °C12 February 1989	24.3 °C	1,707 mm	152
1988	40.7 °C3 September 1988	10.3 °C19 February 1988	24.8 °C	1,260 mm	147
1987	41.2 °C2 July 1987	9.2 °C18 December 1987	25.4 °C	1,314 mm	190
1986	39.3 °C2 July 1986	8.2 °C1 March 1986	24.6 °C	1,290 mm	160
1985	40.0 °C10 June 1985	9.7 °C23 December 1985	24.3 °C	1,234 mm	143
1984	41.2 °C25 July 1984	7.9 °C10 January 1984	24.4 °C	1,131 mm	163
1983	41.4 °C20 June 1983	7.8 °C24 January 1983	24.6 °C	1,582 mm	175
1982	40.5 °C12 May 1982	6.8 °C28 December 1982	24.6 °C	1,626 mm	151
1981	38.0 °C14 May 1981	8.5 °C21 December 1981	24.8 °C	1,640 mm	172
1980	39.8 °C24 April 1980	9.3 °C9 February 1980	24.9 °C	1,467 mm	156
1979	39.3 °C29 July 1979	10.8 °C1 February 1979	24.8 °C	1,314 mm	160
1978	36.9 °C17 July 1978	10.1 °C22 January 1978	24.3 °C	1,827 mm	148
1977	40.7 °C7 June 1977	8.9 °C11 February 1977	24.3 °C	1,128 mm	151
1976	37.5 °C11 July 1976	7.8 °C13 January 1976	23.9 °C	1,271 mm	152
1975	38.8 °C28 April 1975	5.6 °C30 December 1975	24.2 °C	1,664 mm	155
1974	39.9 °C16 July 1974	4.1 °C2 January 1974	24.4 °C	1,741 mm	163
1973	42.0 °C23 June 1973	8.0 °C30 December 1973	25.3 °C	2,393 mm	173
1972	41.2 °C23 June 1972	9.1 °C15 January 1972	24.8 °C	1,521 mm	171
1971	40.7 °C11 May 1971	9.2 °C31 January 1971	24.0 °C	1,451 mm	151
1970	39.5 °C10 June 1970	10.7 °C31 January 1970	24.6 °C	1,221 mm	154
1969	42.0 °C20 May 1969	9.5 °C9 February 1969	25.2 °C	899 mm	189
1968	40.6 °C2 July 1968	7.7 °C5 January 1968	24.7 °C	1,158 mm	152
1967	40.1 °C22 July 1967	6.4 °C4 February 1967	24.1 °C	1,417 mm	142
1966	39.3 °C8 July 1966	10.6 °C3 December 1966	25.0 °C	1,124 mm	156
1965	41.6 °C13 May 1965	9.4 °C18 December 1965	24.7 °C	1,284 mm	166
1964	40.5 °C31 July 1964	8.1 °C19 December 1964	24.2 °C	1,753 mm	147
1963	37.3 °C1 June 1963	5.5 °C15 January 1963	24.0 °C	1,865 mm	142
1962	39.1 °C29 May 1962	8.3 °C28 January 1962	23.9 °C	1,519 mm	156
1961	38.1 °C25 April 1961	7.5 °C18 January 1961	24.5 °C	1,790 mm	144
1960	38.0 °C15 June 1960	6.9 °C3 January 1960	24.5 °C	1,632 mm	157
1959	39.4 °C12 June 1959	8.7 °C14 January 1959	24.5 °C	1,272 mm	149
1958	39.5 °C21 April 1958	7.8 °C1 February 1958	24.1 °C	1,560 mm	165
1957	39.7 °C14 May 1957	8.1 °C13 February 1957	24.4 °C	1,515 mm	152
1956	39.6 °C19 April 1956	9.0 °C10 January 1956	24.1 °C	1,583 mm	158
1955	39.5 °C15 April 1955	3.5 °C12 January 1955	24.1 °C	1,110 mm	151
1954	41.3 °C18 June 1954	9.4 °C17 December 1954	25.2 °C	1,110 mm	163
1953	39.2 °C12 July 1953	11.0 °C13 December 1953	24.9 °C	2,001 mm	159
1952	40.8 °C11 July 1952	8.6 °C20 February 1952	25.4 °C	1,782 mm	180
1951	39.8 °C10 April 1951	9.2 °C14 January 1951	24.8 °C	1,273 mm	175
1950	39.7 °C21 April 1950	11.8 °C17 February 1950	25.1 °C	1,319 mm	166
1949	40.3 °C14 June 1949	8.5 °C16 January 1949	25.2 °C	985 mm	167
1948	40.4 °C30 June 1948	8.1 °C7 January 1948	24.7 °C	1,310 mm	147
1947	38.9 °C7 May 1947	8.6 °C29 December 1947	24.2 °C	1,130 mm	145
1946	40.3 °C17 July 1946	7.4 °C9 January 1946	25.5 °C	754 mm	181
1945	38.5 °C14 July 1945	7.1 °C18 January 1945	23.7 °C	810 mm	129
1944	37.8 °C27 April 1944	6.5 °C22 December 1944	24.3 °C	1,411 mm	155
1943	38.3 °C17 July 1943	9.8 °C13 January 1943	24.1 °C	1,201 mm	145
1942	37.2 °C7 August 1942	9.4 °C16 December 1942	24.2 °C	1,168 mm	135
1941	37.3 °C22 July 1941	11.2 °C1 February 1941	24.5 °C	1,410 mm	148
1940	38.4 °C16 May 1940	9.5 °C1 January 1940	24.1 °C	1,099 mm	132

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

28.5 °C

0.0 °C

Hot days (≥ 30 °C)

170 d/yr

+10

Frost days (< 0 °C)

0 d/yr

Annual rainfall

2089 mm

+676 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	22.1 °C	+0.8 °C	13 mm	-6 mm
Feb	21.3 °C	-1.3 °C	24 mm	+6 mm
Mar	24.8 °C	-1.3 °C	23 mm	-8 mm
Apr	30.2 °C	+0.1 °C	36 mm	-18 mm
May	32.5 °C	-0.6 °C	191 mm	+65 mm
Jun	34.5 °C	0.0 °C	123 mm	-15 mm
Jul	32.8 °C	-1.8 °C	431 mm	+288 mm
Aug	33.1 °C	+0.1 °C	434 mm	+201 mm
Sep	32.3 °C	+1.5 °C	465 mm	+151 mm
Oct	29.1 °C	+1.0 °C	168 mm	-73 mm
Nov	24.5 °C	-0.8 °C	138 mm	+66 mm
Dec	23.8 °C	+1.6 °C	43 mm	+21 mm

The year's extremes

Hottest day

37.9 °C

9 May 2025

Coldest day

8.6 °C

13 Jan 2025

Wettest day

184.1 mm

22 Jul 2025

Windiest day

54.3 km/h

29 Sep 2025

Strongest gust

120.2 km/h

29 Sep 2025

Hottest feels-like

45.7 °C

9 May 2025

Coldest feels-like

6.8 °C

13 Jan 2025

Sunniest day

12.4 h

7 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 Diễn Thành?

Diễn Thành has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 24.7 °C and it receives 1,413 mm of precipitation per year.

What is the hottest day ever recorded in Diễn Thành?

The hottest day measured in Diễn Thành between 1940 and 2025 was 29 May 2015, reaching 42.7 °C.

What is the coldest day in Diễn Thành?

The coldest day measured in Diễn Thành between 1940 and 2025 was 12 January 1955, at 3.5 °C.

Does it snow in Diễn Thành?

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

Has the climate of Diễn Thành warmed?

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

What is the wettest day in Diễn Thành?

The wettest day measured in Diễn Thành between 1940 and 2025 was 31 October 1952, with 352 mm of rain in 24 hours.

What was the windiest day in Diễn Thành?

The windiest day measured in Diễn Thành between 1940 and 2025 was 1 September 1956, with winds reaching 59.1 km/h.

What is the warmest month in Diễn Thành?

The warmest month in Diễn Thành is July (30.4 °C on average); the coldest is January (18.0 °C).

How much does it rain in Diễn Thành?

Diễn Thành receives on average 1,413 mm of precipitation per year, spread over about 136 rainy days.

Is it sunny in Diễn Thành?

Diễn Thành gets on average 7.8 hours of sunshine per day, roughly 2,847 hours per year over 1940-2025.

Are there tropical nights in Diễn Thành?

Yes: Diễn Thành has on average 240 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Diễn Thành?

In Diễn Thành, between 1940 and 2025, the highest apparent temperature reached 48.1 °C on 22 June 2019, and the lowest was 0.3 °C on 12 January 1955.

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