Vallam climate — normals and trends

Q: What is the climate of Vallam?

Vallam has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 28.6 °C and it receives 830 mm of precipitation per year.

Q: What is the hottest day ever recorded in Vallam?

The hottest day measured in Vallam between 1940 and 2025 was 10 May 1973, reaching 44.2 °C.

Q: What is the coldest day in Vallam?

The coldest day measured in Vallam between 1940 and 2025 was 30 December 1941, at 14.8 °C.

Q: Does it snow in Vallam?

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

Q: Has the climate of Vallam warmed?

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

Q: What is the wettest day in Vallam?

The wettest day measured in Vallam between 1940 and 2025 was 22 December 1983, with 243 mm of rain in 24 hours.

Q: What was the windiest day in Vallam?

The windiest day measured in Vallam between 1940 and 2025 was 8 June 1953, with winds reaching 37.6 km/h.

Q: What is the warmest month in Vallam?

The warmest month in Vallam is May (31.8 °C on average); the coldest is January (24.9 °C).

Q: How much does it rain in Vallam?

Vallam receives on average 830 mm of precipitation per year, spread over about 124 rainy days.

Q: Is it sunny in Vallam?

Vallam gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.

Vallam (India) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 28.6 °C and it receives 830 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 May (31.8 °C on average) and the coldest is January (24.9 °C). Rainfall peaks in October.

Vallam averages 0 frost days, 299 hot days (≥ 30 °C) and 124 rainy days per year.

Vallam 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 44.2 °C (on 10 May 1973) and the coldest 14.8 °C (on 30 December 1941).

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

VallamTamil Nadu

coords: 10.72°, 79.06°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthMayColdest monthJanuaryWettest monthOctoberDriest monthFebruary

Mean daily temperature

28.6°C

Average daily high

34.0°C

Average daily low

24.6°C

Annual rainfall

830mm

Sunshine / day

10.2h

Mean relative humidity

67%

Average peak wind

16.2km/h

Seasonal range

6.9°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

299 d/yr

Rainy days (≥ 1 mm)

124 d/yr

Annual snowfall

0.0 cm

Average feels-like high

37.0 °C

Average feels-like low

27.9 °C

Average peak gust

36.0 km/h

Tropical nights (≥ 20 °C)

347 d/yr

Solar radiation

19.5 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.3 °C

since 1940

+0.2 °C per decade · r² = 0.56 · 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

44.2 °C

10 May 1973

Coldest day

14.8 °C

30 December 1941

Wettest day

243 mm

22 December 1983

Windiest day

37.6 km/h

8 June 1953

Strongest gust

82.4 km/h

23 July 1989

Hottest feels-like

47.8 °C

17 May 2013

Coldest feels-like

14.9 °C

30 December 1941

Sunniest day

12.5 h

15 May 1953

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	39.1 °C11 April 2025	19.3 °C21 December 2025	29.0 °C	855 mm	300
2024	40.1 °C6 May 2024	19.9 °C17 January 2024	29.4 °C	1,254 mm	329
2023	39.8 °C3 June 2023	19.0 °C16 January 2023	29.1 °C	1,211 mm	317
2022	38.9 °C24 May 2022	20.2 °C21 November 2022	28.7 °C	1,039 mm	319
2021	39.6 °C30 May 2021	19.1 °C11 February 2021	28.9 °C	1,281 mm	310
2020	40.6 °C24 May 2020	19.9 °C15 January 2020	29.4 °C	1,014 mm	330
2019	41.5 °C2 May 2019	19.2 °C22 January 2019	29.7 °C	713 mm	327
2018	39.0 °C20 April 2018	17.9 °C3 February 2018	29.0 °C	779 mm	327
2017	41.6 °C6 June 2017	18.5 °C8 February 2017	29.2 °C	949 mm	322
2016	40.8 °C24 April 2016	19.9 °C24 December 2016	29.7 °C	598 mm	351
2015	40.1 °C29 August 2015	18.9 °C13 January 2015	29.1 °C	1,259 mm	306
2014	42.7 °C23 May 2014	18.9 °C6 February 2014	29.5 °C	950 mm	304
2013	42.8 °C10 May 2013	19.9 °C14 January 2013	29.5 °C	588 mm	334
2012	42.4 °C21 May 2012	17.1 °C18 January 2012	29.4 °C	642 mm	327
2011	42.0 °C31 May 2011	17.2 °C20 January 2011	28.9 °C	968 mm	288
2010	42.2 °C28 May 2010	18.5 °C4 March 2010	29.0 °C	1,248 mm	295
2009	42.0 °C3 May 2009	18.1 °C24 January 2009	29.3 °C	927 mm	291
2008	41.0 °C2 May 2008	17.6 °C19 January 2008	28.8 °C	1,237 mm	296
2007	41.8 °C21 May 2007	18.3 °C4 January 2007	28.8 °C	1,090 mm	308
2006	41.2 °C16 May 2006	17.6 °C23 January 2006	28.8 °C	929 mm	287
2005	42.1 °C26 May 2005	18.6 °C11 January 2005	29.0 °C	1,158 mm	301
2004	42.8 °C17 April 2004	18.3 °C25 February 2004	28.6 °C	980 mm	282
2003	42.9 °C22 May 2003	18.3 °C10 December 2003	29.3 °C	816 mm	311
2002	40.9 °C12 May 2002	17.4 °C14 January 2002	29.0 °C	580 mm	303
2001	41.8 °C12 May 2001	18.7 °C10 February 2001	28.9 °C	709 mm	289
2000	40.8 °C22 May 2000	18.2 °C24 January 2000	28.6 °C	768 mm	299
1999	40.2 °C16 April 1999	17.4 °C27 January 1999	28.6 °C	734 mm	289
1998	42.4 °C30 May 1998	19.7 °C16 January 1998	29.1 °C	897 mm	306
1997	41.0 °C29 May 1997	17.1 °C1 February 1997	28.9 °C	855 mm	290
1996	40.9 °C7 May 1996	17.6 °C3 December 1996	28.5 °C	1,052 mm	312
1995	40.2 °C2 June 1995	18.5 °C2 January 1995	28.8 °C	789 mm	311
1994	42.0 °C24 May 1994	18.1 °C30 January 1994	28.6 °C	802 mm	271
1993	42.5 °C11 May 1993	17.4 °C19 January 1993	28.6 °C	931 mm	277
1992	41.1 °C11 May 1992	17.8 °C8 January 1992	28.6 °C	634 mm	296
1991	42.0 °C10 May 1991	18.2 °C12 February 1991	28.9 °C	762 mm	297
1990	40.8 °C25 April 1990	15.4 °C20 January 1990	29.0 °C	853 mm	309
1989	42.7 °C14 May 1989	16.5 °C8 February 1989	28.6 °C	756 mm	315
1988	41.0 °C12 May 1988	18.5 °C6 February 1988	28.9 °C	791 mm	327
1987	40.9 °C4 June 1987	18.7 °C12 February 1987	29.2 °C	664 mm	318
1986	43.5 °C21 May 1986	17.1 °C23 February 1986	28.9 °C	673 mm	285
1985	42.3 °C23 April 1985	17.6 °C6 February 1985	28.8 °C	608 mm	281
1984	40.6 °C21 May 1984	16.7 °C14 December 1984	28.0 °C	1,042 mm	250
1983	42.0 °C31 May 1983	17.8 °C9 January 1983	29.0 °C	992 mm	312
1982	41.2 °C4 April 1982	17.9 °C14 February 1982	28.8 °C	511 mm	291
1981	41.1 °C15 April 1981	17.3 °C19 February 1981	28.5 °C	812 mm	294
1980	42.4 °C21 May 1980	17.2 °C28 January 1980	28.9 °C	566 mm	298
1979	41.1 °C4 June 1979	18.7 °C11 January 1979	28.6 °C	752 mm	270
1978	41.4 °C21 May 1978	16.0 °C19 January 1978	28.7 °C	828 mm	304
1977	41.1 °C23 May 1977	16.3 °C13 January 1977	28.4 °C	735 mm	282
1976	41.1 °C22 May 1976	15.9 °C26 February 1976	28.5 °C	621 mm	283
1975	42.0 °C5 May 1975	17.7 °C3 December 1975	28.4 °C	784 mm	304
1974	40.8 °C8 May 1974	16.2 °C7 February 1974	28.6 °C	387 mm	328
1973	44.2 °C10 May 1973	18.4 °C14 January 1973	28.6 °C	694 mm	294
1972	40.3 °C5 June 1972	16.8 °C12 January 1972	28.3 °C	921 mm	286
1971	40.7 °C6 May 1971	17.6 °C21 December 1971	28.1 °C	792 mm	294
1970	41.3 °C7 May 1970	17.6 °C4 December 1970	28.6 °C	656 mm	292
1969	42.4 °C17 April 1969	17.3 °C27 January 1969	29.0 °C	942 mm	302
1968	41.3 °C20 May 1968	17.5 °C7 February 1968	28.3 °C	697 mm	294
1967	41.3 °C6 May 1967	17.4 °C10 February 1967	28.2 °C	1,017 mm	279
1966	43.1 °C24 May 1966	18.4 °C14 December 1966	28.0 °C	1,175 mm	268
1965	41.1 °C20 May 1965	18.6 °C25 January 1965	28.0 °C	1,075 mm	284
1964	42.5 °C1 May 1964	16.6 °C15 January 1964	28.3 °C	872 mm	284
1963	41.6 °C27 May 1963	16.8 °C13 February 1963	28.1 °C	994 mm	266
1962	41.4 °C4 May 1962	18.0 °C11 January 1962	28.1 °C	834 mm	271
1961	40.5 °C16 April 1961	18.3 °C26 February 1961	28.0 °C	660 mm	272
1960	40.9 °C27 April 1960	16.8 °C4 February 1960	28.3 °C	749 mm	285
1959	41.3 °C8 May 1959	18.6 °C12 February 1959	28.6 °C	662 mm	295
1958	41.3 °C5 June 1958	18.1 °C16 February 1958	28.6 °C	881 mm	279
1957	41.5 °C8 May 1957	17.0 °C6 February 1957	28.3 °C	723 mm	271
1956	42.8 °C25 April 1956	16.1 °C22 January 1956	27.8 °C	915 mm	257
1955	40.8 °C14 April 1955	16.9 °C30 December 1955	27.7 °C	866 mm	280
1954	41.3 °C17 April 1954	16.5 °C20 January 1954	27.9 °C	986 mm	280
1953	42.6 °C3 June 1953	19.4 °C31 January 1953	28.7 °C	581 mm	336
1952	42.2 °C19 May 1952	18.4 °C21 January 1952	29.1 °C	473 mm	358
1951	40.9 °C16 May 1951	19.2 °C8 December 1951	28.5 °C	801 mm	328
1950	41.4 °C18 May 1950	18.6 °C2 January 1950	29.1 °C	339 mm	363
1949	42.4 °C25 April 1949	18.4 °C18 February 1949	28.0 °C	676 mm	325
1948	41.5 °C1 June 1948	19.4 °C27 December 1948	28.7 °C	845 mm	296
1947	41.3 °C22 May 1947	17.7 °C9 February 1947	28.3 °C	697 mm	301
1946	42.1 °C28 April 1946	16.5 °C25 January 1946	28.3 °C	867 mm	290
1945	41.6 °C5 May 1945	16.7 °C7 February 1945	28.5 °C	514 mm	302
1944	40.9 °C29 April 1944	18.1 °C24 January 1944	28.0 °C	1,003 mm	277
1943	41.1 °C30 April 1943	18.3 °C19 January 1943	27.4 °C	730 mm	287
1942	38.3 °C28 March 1942	16.7 °C1 January 1942	27.4 °C	709 mm	292
1941	41.3 °C28 April 1941	14.8 °C30 December 1941	27.9 °C	905 mm	287
1940	39.9 °C3 April 1940	16.2 °C9 January 1940	27.5 °C	759 mm	292

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

33.8 °C

-0.2 °C

Hot days (≥ 30 °C)

300 d/yr

Frost days (< 0 °C)

0 d/yr

Annual rainfall

855 mm

+25 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	29.4 °C	-0.3 °C	34 mm	+12 mm
Feb	32.4 °C	-0.2 °C	8 mm	-5 mm
Mar	34.1 °C	-1.5 °C	38 mm	+17 mm
Apr	36.7 °C	-0.6 °C	30 mm	-7 mm
May	36.0 °C	-2.2 °C	120 mm	+61 mm
Jun	36.6 °C	-0.3 °C	23 mm	-24 mm
Jul	36.7 °C	+0.8 °C	27 mm	-24 mm
Aug	35.8 °C	0.0 °C	62 mm	-3 mm
Sep	35.7 °C	+0.4 °C	72 mm	-28 mm
Oct	32.6 °C	+0.1 °C	203 mm	+34 mm
Nov	30.2 °C	+0.3 °C	214 mm	+55 mm
Dec	29.2 °C	+0.4 °C	26 mm	-63 mm

The year's extremes

Hottest day

39.1 °C

11 Apr 2025

Coldest day

19.3 °C

21 Dec 2025

Wettest day

92.9 mm

29 Nov 2025

Windiest day

29.9 km/h

28 May 2025

Strongest gust

69.1 km/h

28 May 2025

Hottest feels-like

45.3 °C

4 May 2025

Coldest feels-like

20.9 °C

21 Dec 2025

Sunniest day

12.3 h

6 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 Vallam?

Vallam has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 28.6 °C and it receives 830 mm of precipitation per year.

What is the hottest day ever recorded in Vallam?

The hottest day measured in Vallam between 1940 and 2025 was 10 May 1973, reaching 44.2 °C.

What is the coldest day in Vallam?

The coldest day measured in Vallam between 1940 and 2025 was 30 December 1941, at 14.8 °C.

Does it snow in Vallam?

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

Has the climate of Vallam warmed?

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

What is the wettest day in Vallam?

The wettest day measured in Vallam between 1940 and 2025 was 22 December 1983, with 243 mm of rain in 24 hours.

What was the windiest day in Vallam?

The windiest day measured in Vallam between 1940 and 2025 was 8 June 1953, with winds reaching 37.6 km/h.

What is the warmest month in Vallam?

The warmest month in Vallam is May (31.8 °C on average); the coldest is January (24.9 °C).

How much does it rain in Vallam?

Vallam receives on average 830 mm of precipitation per year, spread over about 124 rainy days.

Is it sunny in Vallam?

Vallam gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.

Are there tropical nights in Vallam?

Yes: Vallam has on average 347 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Vallam?

In Vallam, between 1940 and 2025, the highest apparent temperature reached 47.8 °C on 17 May 2013, and the lowest was 14.9 °C on 30 December 1941.

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