Diamond Harbour climate — normals and trends

Q: What is the climate of Diamond Harbour?

Diamond Harbour has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.2 °C and it receives 1,659 mm of precipitation per year.

Q: What is the hottest day ever recorded in Diamond Harbour?

The hottest day measured in Diamond Harbour between 1940 and 2025 was 4 May 1966, reaching 44.2 °C.

Q: What is the coldest day in Diamond Harbour?

The coldest day measured in Diamond Harbour between 1940 and 2025 was 20 January 1953, at 8.2 °C.

Q: Does it snow in Diamond Harbour?

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

Q: Has the climate of Diamond Harbour warmed?

Yes: Diamond Harbour warmed by +0.9 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Diamond Harbour?

The wettest day measured in Diamond Harbour between 1940 and 2025 was 17 August 2019, with 227 mm of rain in 24 hours.

Q: What was the windiest day in Diamond Harbour?

The windiest day measured in Diamond Harbour between 1940 and 2025 was 20 May 2020, with winds reaching 50.0 km/h.

Q: What is the warmest month in Diamond Harbour?

The warmest month in Diamond Harbour is May (30.2 °C on average); the coldest is January (19.4 °C).

Q: How much does it rain in Diamond Harbour?

Diamond Harbour receives on average 1,659 mm of precipitation per year, spread over about 156 rainy days.

Q: Is it sunny in Diamond Harbour?

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

Diamond Harbour (India) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.2 °C and it receives 1,659 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 (30.2 °C on average) and the coldest is January (19.4 °C). Rainfall peaks in July.

Diamond Harbour averages 0 frost days, 224 hot days (≥ 30 °C) and 156 rainy days per year.

Diamond Harbour has warmed by +0.9 °C between 1940 and 2025, or +0.11 °C per decade. This trend is statistically significant.

The hottest day of the period reached 44.2 °C (on 4 May 1966) and the coldest 8.2 °C (on 20 January 1953).

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

Diamond HarbourWest Bengal

coords: 22.19°, 88.19°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthMayColdest monthJanuaryWettest monthJulyDriest monthDecember

Mean daily temperature

26.2°C

Average daily high

30.8°C

Average daily low

22.6°C

Annual rainfall

1,659mm

Sunshine / day

9.6h

Mean relative humidity

77%

Average peak wind

13.4km/h

Seasonal range

10.8°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

224 d/yr

Rainy days (≥ 1 mm)

156 d/yr

Annual snowfall

0.0 cm

Average feels-like high

34.7 °C

Average feels-like low

26.0 °C

Average peak gust

29.3 km/h

Tropical nights (≥ 20 °C)

257 d/yr

Solar radiation

17.4 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+0.9 °C

since 1940

+0.1 °C per decade · r² = 0.38 · 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

4 May 1966

Coldest day

8.2 °C

20 January 1953

Wettest day

227 mm

17 August 2019

Windiest day

50.0 km/h

20 May 2020

Strongest gust

110.2 km/h

20 May 2020

Hottest feels-like

48.7 °C

17 June 2005

Coldest feels-like

5.8 °C

26 December 1945

Sunniest day

12.8 h

2 July 1943

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	38.7 °C28 March 2025	10.1 °C31 December 2025	26.6 °C	1,953 mm	243
2024	42.5 °C30 April 2024	10.9 °C23 January 2024	27.1 °C	1,818 mm	250
2023	40.2 °C19 April 2023	11.3 °C7 January 2023	27.1 °C	1,448 mm	264
2022	38.8 °C24 April 2022	11.2 °C29 January 2022	26.6 °C	1,231 mm	244
2021	39.2 °C31 March 2021	10.5 °C1 February 2021	26.8 °C	1,824 mm	250
2020	37.5 °C7 April 2020	11.1 °C20 December 2020	26.4 °C	1,675 mm	255
2019	38.0 °C14 June 2019	10.5 °C28 December 2019	26.7 °C	1,810 mm	243
2018	39.6 °C18 June 2018	9.9 °C11 January 2018	26.6 °C	1,538 mm	265
2017	39.2 °C19 May 2017	10.5 °C15 January 2017	26.8 °C	1,863 mm	259
2016	41.4 °C11 April 2016	9.6 °C25 January 2016	27.1 °C	1,720 mm	250
2015	39.6 °C21 May 2015	11.5 °C1 February 2015	26.9 °C	1,764 mm	262
2014	41.2 °C23 April 2014	9.7 °C9 January 2014	26.5 °C	1,388 mm	242
2013	39.1 °C8 April 2013	8.3 °C9 January 2013	26.3 °C	1,587 mm	236
2012	41.3 °C5 June 2012	9.2 °C15 January 2012	26.5 °C	1,290 mm	249
2011	37.9 °C10 June 2011	9.3 °C12 January 2011	26.3 °C	1,783 mm	248
2010	39.5 °C9 April 2010	11.1 °C24 January 2010	27.0 °C	1,164 mm	275
2009	41.5 °C21 April 2009	10.3 °C28 December 2009	27.0 °C	1,378 mm	269
2008	38.6 °C20 April 2008	10.5 °C3 February 2008	26.2 °C	1,770 mm	233
2007	38.8 °C29 May 2007	10.6 °C5 January 2007	26.2 °C	1,970 mm	228
2006	38.1 °C26 March 2006	9.9 °C11 January 2006	26.6 °C	1,595 mm	256
2005	41.1 °C2 June 2005	11.1 °C21 January 2005	26.5 °C	1,551 mm	232
2004	41.1 °C20 May 2004	10.4 °C10 January 2004	26.4 °C	1,471 mm	247
2003	40.5 °C12 June 2003	8.9 °C23 January 2003	26.2 °C	1,485 mm	229
2002	42.0 °C20 May 2002	11.3 °C2 January 2002	26.3 °C	1,630 mm	238
2001	37.1 °C22 April 2001	8.7 °C12 January 2001	26.0 °C	1,784 mm	230
2000	39.6 °C19 May 2000	9.7 °C7 January 2000	26.1 °C	1,320 mm	235
1999	37.9 °C1 June 1999	10.4 °C19 January 1999	26.3 °C	1,499 mm	240
1998	39.6 °C10 June 1998	9.8 °C6 January 1998	26.2 °C	1,683 mm	234
1997	38.6 °C21 May 1997	9.4 °C27 January 1997	25.9 °C	1,866 mm	240
1996	39.4 °C20 April 1996	10.2 °C17 December 1996	26.2 °C	1,395 mm	230
1995	41.0 °C30 April 1995	9.8 °C4 January 1995	26.1 °C	1,787 mm	212
1994	40.5 °C6 May 1994	11.0 °C19 January 1994	26.2 °C	1,804 mm	233
1993	36.3 °C6 April 1993	9.4 °C24 January 1993	26.0 °C	2,063 mm	223
1992	38.6 °C12 April 1992	10.2 °C3 January 1992	26.0 °C	1,356 mm	229
1991	37.9 °C15 April 1991	10.1 °C5 January 1991	26.3 °C	1,537 mm	232
1990	35.7 °C28 May 1990	9.5 °C4 January 1990	25.8 °C	2,207 mm	188
1989	40.2 °C4 May 1989	9.1 °C14 January 1989	26.0 °C	1,459 mm	232
1988	39.4 °C13 April 1988	11.6 °C28 January 1988	26.3 °C	1,832 mm	247
1987	39.2 °C5 April 1987	10.5 °C4 January 1987	26.4 °C	1,082 mm	232
1986	40.8 °C5 June 1986	10.1 °C6 January 1986	26.3 °C	1,738 mm	216
1985	38.8 °C15 April 1985	12.2 °C31 December 1985	26.3 °C	1,365 mm	221
1984	37.9 °C19 April 1984	11.0 °C21 December 1984	25.9 °C	1,869 mm	227
1983	38.5 °C4 April 1983	10.3 °C7 January 1983	26.2 °C	1,420 mm	226
1982	39.6 °C6 May 1982	10.8 °C2 January 1982	26.2 °C	934 mm	221
1981	36.3 °C4 June 1981	10.6 °C26 December 1981	25.5 °C	1,677 mm	225
1980	39.0 °C24 April 1980	10.6 °C9 January 1980	26.3 °C	1,293 mm	225
1979	40.7 °C19 May 1979	10.5 °C5 February 1979	26.8 °C	1,283 mm	262
1978	38.3 °C30 May 1978	9.1 °C7 January 1978	26.0 °C	1,609 mm	225
1977	37.4 °C31 May 1977	10.1 °C30 January 1977	26.1 °C	1,301 mm	223
1976	41.6 °C2 June 1976	10.3 °C8 January 1976	26.5 °C	1,201 mm	251
1975	42.3 °C9 May 1975	9.6 °C16 January 1975	25.9 °C	1,398 mm	198
1974	40.4 °C26 May 1974	9.4 °C18 January 1974	26.0 °C	1,497 mm	209
1973	40.3 °C18 April 1973	9.9 °C26 December 1973	26.3 °C	1,676 mm	229
1972	42.8 °C19 May 1972	9.7 °C10 January 1972	26.7 °C	1,177 mm	256
1971	36.8 °C4 April 1971	10.0 °C3 January 1971	25.4 °C	1,981 mm	164
1970	39.1 °C17 April 1970	10.5 °C31 December 1970	25.9 °C	1,970 mm	212
1969	38.8 °C15 April 1969	9.9 °C16 January 1969	26.1 °C	1,677 mm	236
1968	40.8 °C11 May 1968	9.4 °C30 December 1968	25.9 °C	2,030 mm	205
1967	40.5 °C6 June 1967	9.3 °C15 January 1967	26.0 °C	1,931 mm	222
1966	44.2 °C4 May 1966	9.0 °C23 December 1966	26.3 °C	1,698 mm	226
1965	43.6 °C2 May 1965	10.0 °C11 January 1965	26.2 °C	1,813 mm	202
1964	41.8 °C10 April 1964	9.9 °C31 January 1964	26.4 °C	1,639 mm	214
1963	39.1 °C1 April 1963	8.9 °C6 January 1963	26.2 °C	1,886 mm	224
1962	39.5 °C26 May 1962	8.4 °C18 January 1962	25.8 °C	1,640 mm	215
1961	40.6 °C19 May 1961	9.3 °C25 December 1961	25.7 °C	1,401 mm	206
1960	41.9 °C30 April 1960	10.0 °C29 January 1960	26.1 °C	1,640 mm	212
1959	41.1 °C9 April 1959	9.1 °C2 January 1959	26.0 °C	2,310 mm	185
1958	41.8 °C27 May 1958	11.6 °C26 December 1958	26.9 °C	1,590 mm	213
1957	43.4 °C7 May 1957	11.3 °C14 January 1957	26.8 °C	1,385 mm	223
1956	42.8 °C11 April 1956	9.9 °C7 February 1956	26.0 °C	1,949 mm	189
1955	43.1 °C13 May 1955	9.3 °C4 January 1955	26.2 °C	1,708 mm	211
1954	43.4 °C16 April 1954	9.6 °C26 January 1954	26.2 °C	1,319 mm	216
1953	35.7 °C24 May 1953	8.2 °C20 January 1953	25.0 °C	2,419 mm	167
1952	35.7 °C3 June 1952	10.8 °C15 December 1952	25.2 °C	2,075 mm	183
1951	37.7 °C13 May 1951	10.4 °C27 January 1951	25.4 °C	2,037 mm	189
1950	38.6 °C24 April 1950	9.1 °C14 February 1950	25.5 °C	2,576 mm	162
1949	36.4 °C23 June 1949	11.1 °C9 February 1949	25.0 °C	2,606 mm	136
1948	40.3 °C12 April 1948	11.4 °C17 December 1948	25.9 °C	2,003 mm	192
1947	43.6 °C26 April 1947	11.4 °C27 December 1947	26.5 °C	1,311 mm	223
1946	41.1 °C13 March 1946	10.4 °C2 January 1946	26.1 °C	1,676 mm	219
1945	43.9 °C6 June 1945	9.3 °C26 December 1945	25.9 °C	1,687 mm	219
1944	41.4 °C4 June 1944	12.4 °C20 January 1944	26.1 °C	1,585 mm	200
1943	41.2 °C4 April 1943	11.6 °C9 February 1943	25.5 °C	1,355 mm	188
1942	43.1 °C7 May 1942	10.8 °C8 February 1942	26.1 °C	1,397 mm	205
1941	38.6 °C5 April 1941	9.2 °C13 January 1941	25.6 °C	2,216 mm	184
1940	39.6 °C12 April 1940	9.2 °C7 January 1940	25.6 °C	1,365 mm	203

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

31.0 °C

+0.2 °C

Hot days (≥ 30 °C)

243 d/yr

+19

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1953 mm

+294 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	26.0 °C	0.0 °C	1 mm	-12 mm
Feb	29.8 °C	+0.7 °C	20 mm	-4 mm
Mar	33.4 °C	+0.2 °C	10 mm	-33 mm
Apr	34.0 °C	-1.0 °C	116 mm	+45 mm
May	34.0 °C	-0.7 °C	147 mm	+29 mm
Jun	32.8 °C	-0.1 °C	432 mm	+170 mm
Jul	31.2 °C	+0.1 °C	496 mm	+149 mm
Aug	31.5 °C	+0.5 °C	302 mm	-26 mm
Sep	32.4 °C	+1.4 °C	285 mm	+21 mm
Oct	32.1 °C	+1.6 °C	132 mm	-6 mm
Nov	29.4 °C	+0.7 °C	11 mm	-25 mm
Dec	25.3 °C	-1.0 °C	0 mm	-13 mm

The year's extremes

Hottest day

38.7 °C

28 Mar 2025

Coldest day

10.1 °C

31 Dec 2025

Wettest day

61.5 mm

17 Jun 2025

Windiest day

29.4 km/h

18 Jun 2025

Strongest gust

63.0 km/h

19 Jun 2025

Hottest feels-like

46.0 °C

9 May 2025

Coldest feels-like

9.0 °C

31 Dec 2025

Sunniest day

12.3 h

9 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 Diamond Harbour?

Diamond Harbour has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.2 °C and it receives 1,659 mm of precipitation per year.

What is the hottest day ever recorded in Diamond Harbour?

The hottest day measured in Diamond Harbour between 1940 and 2025 was 4 May 1966, reaching 44.2 °C.

What is the coldest day in Diamond Harbour?

The coldest day measured in Diamond Harbour between 1940 and 2025 was 20 January 1953, at 8.2 °C.

Does it snow in Diamond Harbour?

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

Has the climate of Diamond Harbour warmed?

Yes: Diamond Harbour warmed by +0.9 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Diamond Harbour?

The wettest day measured in Diamond Harbour between 1940 and 2025 was 17 August 2019, with 227 mm of rain in 24 hours.

What was the windiest day in Diamond Harbour?

The windiest day measured in Diamond Harbour between 1940 and 2025 was 20 May 2020, with winds reaching 50.0 km/h.

What is the warmest month in Diamond Harbour?

The warmest month in Diamond Harbour is May (30.2 °C on average); the coldest is January (19.4 °C).

How much does it rain in Diamond Harbour?

Diamond Harbour receives on average 1,659 mm of precipitation per year, spread over about 156 rainy days.

Is it sunny in Diamond Harbour?

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

Are there tropical nights in Diamond Harbour?

Yes: Diamond Harbour has on average 257 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Diamond Harbour?

In Diamond Harbour, between 1940 and 2025, the highest apparent temperature reached 48.7 °C on 17 June 2005, and the lowest was 5.8 °C on 26 December 1945.

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