Nam Som climate — normals and trends

Q: What is the climate of Nam Som?

Nam Som has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 25.8 °C and it receives 1,651 mm of precipitation per year.

Q: What is the hottest day ever recorded in Nam Som?

The hottest day measured in Nam Som between 1940 and 2025 was 6 May 2023, reaching 42.2 °C.

Q: What is the coldest day in Nam Som?

The coldest day measured in Nam Som between 1940 and 2025 was 13 January 1955, at 4.5 °C.

Q: Does it snow in Nam Som?

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

Q: Has the climate of Nam Som warmed?

Yes: Nam Som warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Nam Som?

The wettest day measured in Nam Som between 1940 and 2025 was 7 September 1956, with 160 mm of rain in 24 hours.

Q: What was the windiest day in Nam Som?

The windiest day measured in Nam Som between 1940 and 2025 was 17 September 1962, with winds reaching 28.8 km/h.

Q: What is the warmest month in Nam Som?

The warmest month in Nam Som is April (28.4 °C on average); the coldest is December (21.6 °C).

Q: How much does it rain in Nam Som?

Nam Som receives on average 1,651 mm of precipitation per year, spread over about 169 rainy days.

Q: Is it sunny in Nam Som?

Nam Som gets on average 9.6 hours of sunshine per day, roughly 3,504 hours per year over 1940-2025.

Nam Som (Thailand) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 25.8 °C and it receives 1,651 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 April (28.4 °C on average) and the coldest is December (21.6 °C). Rainfall peaks in August.

Nam Som averages 0 frost days, 235 hot days (≥ 30 °C) and 169 rainy days per year.

Nam Som 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 42.2 °C (on 6 May 2023) and the coldest 4.5 °C (on 13 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

Nam SomUdon Thani

coords: 17.77°, 102.19°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthAprilColdest monthDecemberWettest monthAugustDriest monthDecember

Mean daily temperature

25.8°C

Average daily high

31.0°C

Average daily low

21.6°C

Annual rainfall

1,651mm

Sunshine / day

9.6h

Mean relative humidity

74%

Average peak wind

10.0km/h

Seasonal range

6.8°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

235 d/yr

Rainy days (≥ 1 mm)

169 d/yr

Annual snowfall

0.0 cm

Average feels-like high

35.0 °C

Average feels-like low

24.7 °C

Average peak gust

26.8 km/h

Tropical nights (≥ 20 °C)

263 d/yr

Solar radiation

18.0 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.9 °C

since 1940

+0.2 °C per decade · r² = 0.71 · 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

42.2 °C

6 May 2023

Coldest day

4.5 °C

13 January 1955

Wettest day

160 mm

7 September 1956

Windiest day

28.8 km/h

17 September 1962

Strongest gust

70.9 km/h

22 October 1952

Hottest feels-like

47.4 °C

7 May 2023

Coldest feels-like

1.3 °C

13 January 1955

Sunniest day

12.8 h

26 June 1941

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	38.2 °C27 March 2025	10.3 °C13 January 2025	26.2 °C	1,543 mm	247
2024	41.8 °C27 April 2024	12.9 °C21 December 2024	27.4 °C	1,450 mm	304
2023	42.2 °C6 May 2023	10.0 °C31 January 2023	27.3 °C	1,423 mm	297
2022	37.4 °C27 April 2022	12.0 °C19 December 2022	26.6 °C	1,703 mm	287
2021	38.1 °C29 March 2021	11.0 °C2 January 2021	26.7 °C	1,476 mm	269
2020	40.7 °C21 April 2020	13.4 °C21 December 2020	27.0 °C	1,355 mm	295
2019	41.1 °C20 April 2019	8.8 °C8 December 2019	27.4 °C	1,201 mm	318
2018	38.4 °C14 April 2018	12.5 °C6 February 2018	26.5 °C	1,525 mm	279
2017	39.3 °C13 March 2017	8.1 °C21 December 2017	26.6 °C	1,879 mm	274
2016	41.5 °C11 April 2016	9.4 °C8 February 2016	26.9 °C	1,596 mm	286
2015	40.2 °C20 April 2015	10.7 °C14 January 2015	27.0 °C	1,369 mm	288
2014	39.5 °C31 March 2014	8.0 °C24 January 2014	26.5 °C	1,403 mm	278
2013	40.4 °C5 April 2013	9.8 °C29 December 2013	26.3 °C	1,585 mm	254
2012	39.1 °C19 April 2012	14.2 °C10 January 2012	26.9 °C	1,491 mm	302
2011	37.4 °C16 April 2011	10.5 °C26 December 2011	25.6 °C	1,898 mm	230
2010	40.3 °C14 April 2010	13.0 °C17 December 2010	26.8 °C	1,763 mm	268
2009	39.6 °C24 April 2009	8.2 °C14 January 2009	26.4 °C	1,484 mm	267
2008	36.3 °C30 March 2008	10.5 °C3 January 2008	25.5 °C	1,810 mm	227
2007	40.5 °C23 April 2007	10.0 °C30 January 2007	26.4 °C	1,657 mm	260
2006	37.4 °C13 April 2006	11.0 °C22 December 2006	26.4 °C	1,564 mm	278
2005	40.5 °C12 April 2005	9.5 °C2 January 2005	26.6 °C	1,487 mm	262
2004	38.7 °C30 March 2004	11.0 °C25 January 2004	25.9 °C	1,440 mm	247
2003	40.9 °C7 May 2003	10.3 °C21 December 2003	26.4 °C	1,487 mm	272
2002	38.4 °C15 March 2002	12.8 °C7 January 2002	26.3 °C	1,884 mm	255
2001	39.7 °C21 April 2001	11.9 °C25 December 2001	26.2 °C	1,675 mm	258
2000	39.4 °C3 April 2000	9.9 °C2 February 2000	25.8 °C	1,976 mm	239
1999	38.2 °C13 March 1999	5.3 °C24 December 1999	25.6 °C	1,828 mm	223
1998	39.4 °C14 April 1998	11.5 °C12 December 1998	26.8 °C	1,414 mm	289
1997	37.9 °C7 May 1997	11.9 °C11 January 1997	26.0 °C	1,507 mm	252
1996	38.2 °C20 March 1996	9.6 °C1 January 1996	25.4 °C	1,780 mm	218
1995	39.5 °C23 April 1995	9.9 °C30 December 1995	26.0 °C	1,809 mm	235
1994	37.9 °C4 May 1994	13.7 °C24 January 1994	25.8 °C	1,915 mm	224
1993	38.6 °C28 March 1993	9.5 °C31 January 1993	25.8 °C	1,244 mm	252
1992	40.0 °C21 April 1992	9.7 °C15 January 1992	25.6 °C	1,640 mm	222
1991	39.0 °C18 April 1991	11.9 °C29 December 1991	26.2 °C	1,490 mm	242
1990	41.2 °C23 April 1990	11.4 °C3 December 1990	26.1 °C	1,682 mm	253
1989	38.3 °C20 April 1989	11.5 °C9 January 1989	25.6 °C	1,771 mm	234
1988	39.5 °C17 March 1988	11.8 °C13 December 1988	26.0 °C	1,675 mm	234
1987	38.0 °C25 March 1987	8.9 °C7 December 1987	26.0 °C	1,657 mm	249
1986	39.4 °C30 March 1986	8.4 °C7 January 1986	25.7 °C	1,621 mm	241
1985	40.0 °C13 April 1985	8.7 °C24 December 1985	25.8 °C	1,453 mm	231
1984	39.6 °C5 April 1984	10.7 °C10 January 1984	25.7 °C	1,667 mm	233
1983	41.0 °C14 April 1983	8.0 °C24 January 1983	25.8 °C	1,837 mm	235
1982	37.8 °C19 March 1982	8.3 °C20 December 1982	25.7 °C	1,742 mm	225
1981	38.1 °C6 April 1981	10.1 °C21 December 1981	25.7 °C	1,660 mm	217
1980	39.4 °C23 April 1980	12.3 °C30 January 1980	26.2 °C	1,840 mm	240
1979	39.2 °C9 April 1979	12.5 °C28 December 1979	26.0 °C	1,684 mm	247
1978	37.8 °C7 March 1978	10.9 °C18 December 1978	25.6 °C	2,205 mm	230
1977	38.4 °C17 April 1977	12.4 °C23 February 1977	25.6 °C	1,738 mm	227
1976	37.8 °C17 April 1976	6.9 °C2 January 1976	25.1 °C	1,880 mm	220
1975	40.3 °C28 April 1975	5.6 °C31 December 1975	25.6 °C	2,125 mm	231
1974	37.6 °C24 February 1974	7.3 °C2 January 1974	25.3 °C	1,890 mm	207
1973	40.6 °C7 April 1973	7.9 °C29 December 1973	25.9 °C	1,815 mm	243
1972	37.2 °C23 June 1972	9.1 °C16 January 1972	25.7 °C	1,899 mm	241
1971	37.5 °C8 April 1971	8.0 °C5 January 1971	24.9 °C	1,612 mm	205
1970	38.0 °C12 March 1970	11.9 °C1 February 1970	25.8 °C	1,666 mm	221
1969	38.5 °C28 March 1969	11.2 °C12 December 1969	25.7 °C	1,522 mm	235
1968	37.5 °C3 April 1968	10.8 °C2 January 1968	25.6 °C	1,567 mm	237
1967	37.9 °C2 April 1967	6.6 °C17 January 1967	25.2 °C	1,265 mm	196
1966	37.0 °C13 May 1966	11.9 °C3 December 1966	25.7 °C	1,575 mm	191
1965	38.4 °C3 April 1965	10.0 °C18 January 1965	25.5 °C	1,827 mm	235
1964	37.7 °C6 April 1964	10.1 °C19 December 1964	25.1 °C	1,786 mm	202
1963	38.7 °C21 April 1963	6.1 °C16 January 1963	24.9 °C	1,874 mm	197
1962	39.2 °C2 April 1962	8.9 °C29 January 1962	24.9 °C	1,881 mm	209
1961	38.2 °C25 March 1961	5.7 °C19 January 1961	25.4 °C	1,822 mm	219
1960	40.3 °C28 April 1960	9.9 °C4 January 1960	25.7 °C	1,765 mm	228
1959	38.0 °C11 April 1959	10.8 °C19 January 1959	25.5 °C	1,803 mm	231
1958	41.0 °C24 April 1958	10.5 °C13 December 1958	25.5 °C	1,608 mm	215
1957	39.4 °C23 April 1957	12.1 °C20 January 1957	25.6 °C	1,895 mm	233
1956	38.8 °C24 March 1956	9.5 °C17 January 1956	25.1 °C	1,852 mm	218
1955	41.4 °C18 April 1955	4.5 °C13 January 1955	25.0 °C	1,586 mm	229
1954	39.0 °C18 April 1954	8.8 °C17 December 1954	25.4 °C	1,175 mm	237
1953	37.0 °C15 April 1953	10.0 °C12 December 1953	24.7 °C	2,115 mm	190
1952	37.1 °C12 April 1952	8.3 °C11 December 1952	25.1 °C	2,089 mm	205
1951	38.8 °C9 April 1951	11.4 °C17 January 1951	25.0 °C	1,701 mm	205
1950	40.2 °C24 April 1950	11.1 °C6 February 1950	25.2 °C	1,500 mm	194
1949	37.2 °C26 February 1949	7.0 °C17 January 1949	25.5 °C	1,448 mm	213
1948	38.5 °C13 March 1948	8.5 °C3 January 1948	24.9 °C	1,792 mm	180
1947	38.0 °C7 May 1947	8.8 °C30 December 1947	25.4 °C	1,356 mm	207
1946	38.5 °C19 March 1946	9.1 °C10 January 1946	25.7 °C	829 mm	230
1945	37.1 °C4 March 1945	8.7 °C18 January 1945	24.9 °C	1,619 mm	181
1944	39.0 °C10 April 1944	8.8 °C21 December 1944	25.5 °C	1,240 mm	213
1943	37.6 °C25 March 1943	9.6 °C13 January 1943	24.6 °C	1,637 mm	167
1942	36.9 °C17 April 1942	10.5 °C7 December 1942	24.6 °C	1,741 mm	137
1941	38.7 °C23 March 1941	13.8 °C31 December 1941	25.3 °C	1,539 mm	150
1940	38.6 °C10 March 1940	9.5 °C2 January 1940	24.6 °C	1,684 mm	143

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

31.4 °C

+0.4 °C

Hot days (≥ 30 °C)

247 d/yr

+12

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1543 mm

-108 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	27.9 °C	-0.5 °C	0 mm	-11 mm
Feb	31.0 °C	0.0 °C	39 mm	+23 mm
Mar	33.2 °C	-0.3 °C	4 mm	-39 mm
Apr	35.0 °C	+0.8 °C	60 mm	-32 mm
May	33.3 °C	+0.8 °C	199 mm	-38 mm
Jun	32.8 °C	+0.9 °C	188 mm	-58 mm
Jul	31.3 °C	-0.1 °C	318 mm	+75 mm
Aug	32.0 °C	+1.1 °C	339 mm	+32 mm
Sep	31.5 °C	+0.9 °C	245 mm	-62 mm
Oct	31.5 °C	+1.3 °C	67 mm	-50 mm
Nov	28.3 °C	-0.9 °C	69 mm	+44 mm
Dec	28.7 °C	+1.1 °C	15 mm	+8 mm

The year's extremes

Hottest day

38.2 °C

27 Mar 2025

Coldest day

10.3 °C

13 Jan 2025

Wettest day

59.5 mm

31 Aug 2025

Windiest day

25.7 km/h

31 Aug 2025

Strongest gust

54.4 km/h

23 Jul 2025

Hottest feels-like

44.4 °C

25 Apr 2025

Coldest feels-like

8.4 °C

13 Jan 2025

Sunniest day

12.7 h

18 Jul 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 Nam Som?

Nam Som has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 25.8 °C and it receives 1,651 mm of precipitation per year.

What is the hottest day ever recorded in Nam Som?

The hottest day measured in Nam Som between 1940 and 2025 was 6 May 2023, reaching 42.2 °C.

What is the coldest day in Nam Som?

The coldest day measured in Nam Som between 1940 and 2025 was 13 January 1955, at 4.5 °C.

Does it snow in Nam Som?

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

Has the climate of Nam Som warmed?

Yes: Nam Som warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Nam Som?

The wettest day measured in Nam Som between 1940 and 2025 was 7 September 1956, with 160 mm of rain in 24 hours.

What was the windiest day in Nam Som?

The windiest day measured in Nam Som between 1940 and 2025 was 17 September 1962, with winds reaching 28.8 km/h.

What is the warmest month in Nam Som?

The warmest month in Nam Som is April (28.4 °C on average); the coldest is December (21.6 °C).

How much does it rain in Nam Som?

Nam Som receives on average 1,651 mm of precipitation per year, spread over about 169 rainy days.

Is it sunny in Nam Som?

Nam Som gets on average 9.6 hours of sunshine per day, roughly 3,504 hours per year over 1940-2025.

Are there tropical nights in Nam Som?

Yes: Nam Som has on average 263 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Nam Som?

In Nam Som, between 1940 and 2025, the highest apparent temperature reached 47.4 °C on 7 May 2023, and the lowest was 1.3 °C on 13 January 1955.

Compare Nam Som with another city

Pick a second city: its normals will be set against these, indicator by indicator.

Nearby cities

The climate around Nam Som

Other cities — Thailand

All cities in Thailand →