Tha Bo climate — normals and trends

Q: What is the climate of Tha Bo?

Tha Bo has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.2 °C and it receives 1,706 mm of precipitation per year.

Q: What is the hottest day ever recorded in Tha Bo?

The hottest day measured in Tha Bo between 1940 and 2025 was 6 May 2023, reaching 42.7 °C.

Q: What is the coldest day in Tha Bo?

The coldest day measured in Tha Bo between 1940 and 2025 was 12 January 1955, at 4.7 °C.

Q: Does it snow in Tha Bo?

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

Q: Has the climate of Tha Bo warmed?

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

Q: What is the wettest day in Tha Bo?

The wettest day measured in Tha Bo between 1940 and 2025 was 27 June 1983, with 173 mm of rain in 24 hours.

Q: What was the windiest day in Tha Bo?

The windiest day measured in Tha Bo between 1940 and 2025 was 17 September 1962, with winds reaching 30.6 km/h.

Q: What is the warmest month in Tha Bo?

The warmest month in Tha Bo is April (28.9 °C on average); the coldest is January (22.0 °C).

Q: How much does it rain in Tha Bo?

Tha Bo receives on average 1,706 mm of precipitation per year, spread over about 167 rainy days.

Q: Is it sunny in Tha Bo?

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

Tha Bo (Thailand) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.2 °C and it receives 1,706 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 (28.9 °C on average) and the coldest is January (22.0 °C). Rainfall peaks in August.

Tha Bo averages 0 frost days, 254 hot days (≥ 30 °C) and 167 rainy days per year.

Tha Bo 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 42.7 °C (on 6 May 2023) and the coldest 4.7 °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

Tha BoNong Khai

coords: 17.85°, 102.58°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthAprilColdest monthJanuaryWettest monthAugustDriest monthDecember

Mean daily temperature

26.2°C

Average daily high

31.3°C

Average daily low

22.1°C

Annual rainfall

1,706mm

Sunshine / day

9.6h

Mean relative humidity

74%

Average peak wind

10.4km/h

Seasonal range

6.9°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

254 d/yr

Rainy days (≥ 1 mm)

167 d/yr

Annual snowfall

0.0 cm

Average feels-like high

35.7 °C

Average feels-like low

25.4 °C

Average peak gust

26.4 km/h

Tropical nights (≥ 20 °C)

272 d/yr

Solar radiation

18.1 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.9 °C

since 1940

+0.2 °C per decade · r² = 0.70 · 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

6 May 2023

Coldest day

4.7 °C

12 January 1955

Wettest day

173 mm

27 June 1983

Windiest day

30.6 km/h

17 September 1962

Strongest gust

69.1 km/h

22 October 1952

Hottest feels-like

48.4 °C

7 May 2023

Coldest feels-like

1.5 °C

12 January 1955

Sunniest day

12.8 h

12 July 1941

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	39.2 °C25 April 2025	10.2 °C14 January 2025	26.6 °C	1,551 mm	267
2024	42.4 °C27 April 2024	13.6 °C30 December 2024	27.8 °C	1,510 mm	312
2023	42.7 °C6 May 2023	10.1 °C31 January 2023	27.7 °C	1,558 mm	301
2022	38.1 °C28 April 2022	12.0 °C20 December 2022	27.0 °C	1,765 mm	296
2021	38.8 °C29 March 2021	10.1 °C3 January 2021	27.1 °C	1,430 mm	289
2020	41.3 °C21 April 2020	13.9 °C21 December 2020	27.5 °C	1,365 mm	303
2019	41.3 °C20 April 2019	9.8 °C8 December 2019	27.8 °C	1,238 mm	324
2018	38.7 °C13 April 2018	13.0 °C6 February 2018	27.0 °C	1,588 mm	298
2017	40.2 °C3 May 2017	8.6 °C21 December 2017	27.1 °C	1,938 mm	293
2016	42.2 °C12 April 2016	9.7 °C8 February 2016	27.3 °C	1,646 mm	299
2015	41.3 °C20 April 2015	11.0 °C14 January 2015	27.5 °C	1,339 mm	302
2014	39.7 °C31 March 2014	7.7 °C24 January 2014	26.9 °C	1,448 mm	288
2013	41.2 °C5 April 2013	10.5 °C29 December 2013	26.8 °C	1,653 mm	272
2012	39.4 °C19 April 2012	14.4 °C10 January 2012	27.3 °C	1,515 mm	312
2011	38.3 °C17 April 2011	10.8 °C26 December 2011	26.0 °C	1,908 mm	248
2010	40.7 °C14 April 2010	13.6 °C27 December 2010	27.2 °C	1,787 mm	282
2009	40.3 °C24 April 2009	8.8 °C12 January 2009	26.8 °C	1,506 mm	283
2008	36.7 °C30 March 2008	10.7 °C3 January 2008	25.9 °C	1,821 mm	243
2007	40.7 °C23 April 2007	10.4 °C30 January 2007	26.9 °C	1,719 mm	284
2006	38.5 °C6 April 2006	11.3 °C23 December 2006	26.9 °C	1,535 mm	297
2005	40.9 °C12 April 2005	10.4 °C2 January 2005	27.0 °C	1,636 mm	279
2004	39.2 °C31 March 2004	11.6 °C25 January 2004	26.3 °C	1,556 mm	268
2003	41.5 °C7 May 2003	10.7 °C21 December 2003	26.8 °C	1,505 mm	279
2002	39.4 °C22 April 2002	13.2 °C4 January 2002	26.8 °C	1,943 mm	272
2001	40.7 °C21 April 2001	12.1 °C24 December 2001	26.7 °C	1,854 mm	270
2000	39.2 °C3 April 2000	10.4 °C2 February 2000	26.2 °C	2,039 mm	261
1999	38.5 °C18 March 1999	5.6 °C25 December 1999	26.1 °C	1,861 mm	244
1998	40.1 °C13 April 1998	12.3 °C12 December 1998	27.3 °C	1,478 mm	305
1997	38.5 °C7 May 1997	12.6 °C11 January 1997	26.4 °C	1,610 mm	266
1996	38.5 °C20 March 1996	9.6 °C1 January 1996	25.8 °C	1,871 mm	230
1995	39.7 °C23 April 1995	10.6 °C30 December 1995	26.4 °C	1,912 mm	254
1994	38.3 °C4 May 1994	13.9 °C24 January 1994	26.2 °C	2,012 mm	242
1993	38.8 °C27 March 1993	9.6 °C31 January 1993	26.2 °C	1,311 mm	267
1992	40.4 °C21 April 1992	10.4 °C15 January 1992	26.0 °C	1,623 mm	245
1991	39.5 °C19 April 1991	12.3 °C28 December 1991	26.6 °C	1,510 mm	262
1990	41.2 °C23 April 1990	12.1 °C5 December 1990	26.4 °C	1,761 mm	266
1989	39.5 °C22 April 1989	12.0 °C3 December 1989	26.1 °C	1,839 mm	253
1988	39.7 °C17 March 1988	12.0 °C13 December 1988	26.4 °C	1,744 mm	242
1987	38.1 °C25 March 1987	9.6 °C8 December 1987	26.4 °C	1,649 mm	261
1986	39.5 °C30 March 1986	9.4 °C7 January 1986	26.1 °C	1,767 mm	255
1985	40.4 °C10 April 1985	9.8 °C24 December 1985	26.2 °C	1,533 mm	247
1984	40.0 °C4 April 1984	11.0 °C10 January 1984	26.0 °C	1,759 mm	240
1983	41.2 °C14 April 1983	8.2 °C24 January 1983	26.1 °C	1,859 mm	247
1982	38.0 °C12 May 1982	8.5 °C20 December 1982	26.1 °C	1,817 mm	239
1981	38.1 °C6 April 1981	10.8 °C14 January 1981	26.0 °C	1,789 mm	236
1980	39.9 °C23 April 1980	13.1 °C8 January 1980	26.6 °C	1,930 mm	275
1979	38.9 °C1 April 1979	11.8 °C28 December 1979	26.3 °C	1,799 mm	268
1978	38.0 °C7 March 1978	11.7 °C18 December 1978	26.0 °C	2,388 mm	244
1977	38.6 °C17 April 1977	12.9 °C23 February 1977	26.0 °C	1,693 mm	244
1976	39.0 °C17 April 1976	8.2 °C2 January 1976	25.5 °C	1,930 mm	238
1975	40.9 °C28 April 1975	6.0 °C31 December 1975	26.0 °C	2,353 mm	246
1974	37.7 °C24 February 1974	7.1 °C2 January 1974	25.7 °C	1,928 mm	226
1973	41.0 °C7 April 1973	7.4 °C27 December 1973	26.4 °C	1,903 mm	260
1972	37.7 °C23 June 1972	10.0 °C16 January 1972	26.1 °C	1,910 mm	258
1971	37.9 °C8 April 1971	9.0 °C5 January 1971	25.4 °C	1,582 mm	222
1970	38.6 °C12 March 1970	12.7 °C1 February 1970	26.2 °C	1,665 mm	240
1969	38.9 °C28 March 1969	11.4 °C5 December 1969	26.2 °C	1,478 mm	251
1968	38.1 °C28 March 1968	11.5 °C2 January 1968	26.0 °C	1,672 mm	268
1967	38.6 °C31 March 1967	7.1 °C17 January 1967	25.7 °C	1,295 mm	217
1966	37.7 °C13 May 1966	12.4 °C1 January 1966	26.1 °C	1,631 mm	234
1965	38.2 °C3 April 1965	10.5 °C19 January 1965	25.9 °C	1,897 mm	255
1964	37.6 °C7 April 1964	9.6 °C19 December 1964	25.5 °C	1,987 mm	218
1963	39.0 °C21 April 1963	6.7 °C16 January 1963	25.3 °C	1,919 mm	215
1962	39.2 °C2 April 1962	9.5 °C6 December 1962	25.3 °C	1,909 mm	223
1961	38.2 °C25 March 1961	6.2 °C19 January 1961	25.8 °C	1,882 mm	241
1960	40.9 °C2 May 1960	9.7 °C4 January 1960	26.1 °C	1,823 mm	256
1959	37.7 °C11 April 1959	11.4 °C14 January 1959	25.9 °C	1,901 mm	250
1958	41.6 °C24 April 1958	11.3 °C14 February 1958	25.9 °C	1,629 mm	238
1957	40.1 °C23 April 1957	12.8 °C20 January 1957	26.0 °C	1,923 mm	255
1956	39.2 °C24 March 1956	9.4 °C17 January 1956	25.5 °C	1,879 mm	239
1955	41.6 °C18 April 1955	4.7 °C12 January 1955	25.4 °C	1,633 mm	245
1954	39.5 °C18 April 1954	8.8 °C18 December 1954	25.8 °C	1,238 mm	259
1953	36.7 °C15 April 1953	10.6 °C12 December 1953	25.2 °C	2,125 mm	213
1952	37.9 °C12 April 1952	8.9 °C11 December 1952	25.5 °C	2,229 mm	230
1951	39.1 °C9 April 1951	12.1 °C17 January 1951	25.5 °C	1,689 mm	233
1950	40.4 °C24 April 1950	11.8 °C6 February 1950	25.6 °C	1,514 mm	213
1949	37.4 °C15 June 1949	7.8 °C17 January 1949	26.0 °C	1,515 mm	232
1948	38.9 °C13 March 1948	7.9 °C3 January 1948	25.4 °C	1,790 mm	214
1947	38.7 °C7 May 1947	9.9 °C30 December 1947	25.9 °C	1,413 mm	232
1946	38.9 °C27 March 1946	9.4 °C11 January 1946	26.2 °C	829 mm	266
1945	37.1 °C4 March 1945	9.2 °C18 January 1945	25.3 °C	1,700 mm	221
1944	39.4 °C8 April 1944	8.9 °C21 December 1944	26.0 °C	1,274 mm	244
1943	37.8 °C25 March 1943	10.0 °C13 January 1943	25.0 °C	1,637 mm	190
1942	37.8 °C20 April 1942	11.2 °C7 December 1942	25.1 °C	1,785 mm	172
1941	38.9 °C23 March 1941	14.4 °C31 December 1941	25.7 °C	1,599 mm	174
1940	38.7 °C10 March 1940	9.9 °C2 January 1940	25.0 °C	1,800 mm	170

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

31.8 °C

+0.5 °C

Hot days (≥ 30 °C)

267 d/yr

+13

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1551 mm

-155 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	28.3 °C	-0.4 °C	0 mm	-11 mm
Feb	31.4 °C	+0.2 °C	37 mm	+22 mm
Mar	33.5 °C	-0.2 °C	6 mm	-35 mm
Apr	35.6 °C	+1.0 °C	56 mm	-29 mm
May	33.8 °C	+0.8 °C	182 mm	-53 mm
Jun	33.2 °C	+0.9 °C	211 mm	-56 mm
Jul	31.6 °C	-0.1 °C	339 mm	+71 mm
Aug	32.4 °C	+1.1 °C	341 mm	+10 mm
Sep	31.9 °C	+0.8 °C	236 mm	-76 mm
Oct	32.1 °C	+1.4 °C	69 mm	-44 mm
Nov	29.0 °C	-0.6 °C	63 mm	+40 mm
Dec	29.5 °C	+1.5 °C	11 mm	+5 mm

The year's extremes

Hottest day

39.2 °C

25 Apr 2025

Coldest day

10.2 °C

14 Jan 2025

Wettest day

69.4 mm

26 Aug 2025

Windiest day

28.3 km/h

26 Jan 2025

Strongest gust

55.4 km/h

26 Jan 2025

Hottest feels-like

45.5 °C

25 Apr 2025

Coldest feels-like

8.5 °C

14 Jan 2025

Sunniest day

12.6 h

25 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 Tha Bo?

Tha Bo has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.2 °C and it receives 1,706 mm of precipitation per year.

What is the hottest day ever recorded in Tha Bo?

The hottest day measured in Tha Bo between 1940 and 2025 was 6 May 2023, reaching 42.7 °C.

What is the coldest day in Tha Bo?

The coldest day measured in Tha Bo between 1940 and 2025 was 12 January 1955, at 4.7 °C.

Does it snow in Tha Bo?

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

Has the climate of Tha Bo warmed?

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

What is the wettest day in Tha Bo?

The wettest day measured in Tha Bo between 1940 and 2025 was 27 June 1983, with 173 mm of rain in 24 hours.

What was the windiest day in Tha Bo?

The windiest day measured in Tha Bo between 1940 and 2025 was 17 September 1962, with winds reaching 30.6 km/h.

What is the warmest month in Tha Bo?

The warmest month in Tha Bo is April (28.9 °C on average); the coldest is January (22.0 °C).

How much does it rain in Tha Bo?

Tha Bo receives on average 1,706 mm of precipitation per year, spread over about 167 rainy days.

Is it sunny in Tha Bo?

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

Are there tropical nights in Tha Bo?

Yes: Tha Bo has on average 272 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Tha Bo?

In Tha Bo, between 1940 and 2025, the highest apparent temperature reached 48.4 °C on 7 May 2023, and the lowest was 1.5 °C on 12 January 1955.

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