Chalmette climate — normals and trends

Q: What is the climate of Chalmette?

Chalmette has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 20.6 °C and it receives 1,291 mm of precipitation per year.

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

The hottest day measured in Chalmette between 1940 and 2025 was 27 August 2023, reaching 37.4 °C.

Q: What is the coldest day in Chalmette?

The coldest day measured in Chalmette between 1940 and 2025 was 21 January 1985, at -9.9 °C.

Q: Does it snow in Chalmette?

Almost never: Chalmette sees virtually no snow, with about 2 frost days per year.

Q: Has the climate of Chalmette warmed?

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

Q: What is the wettest day in Chalmette?

The wettest day measured in Chalmette between 1940 and 2025 was 29 August 2012, with 261 mm of rain in 24 hours.

Q: What was the windiest day in Chalmette?

The windiest day measured in Chalmette between 1940 and 2025 was 29 August 2005, with winds reaching 117.9 km/h.

Q: What is the warmest month in Chalmette?

The warmest month in Chalmette is July (27.7 °C on average); the coldest is January (12.2 °C).

Q: How much does it rain in Chalmette?

Chalmette receives on average 1,291 mm of precipitation per year, spread over about 135 rainy days.

Q: Is it sunny in Chalmette?

Chalmette gets on average 9.7 hours of sunshine per day, roughly 3,540 hours per year over 1940-2025.

Chalmette (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 20.6 °C and it receives 1,291 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 (27.7 °C on average) and the coldest is January (12.2 °C). Rainfall peaks in August.

Chalmette averages 2 frost days, 71 hot days (≥ 30 °C) and 135 rainy days per year.

Chalmette has warmed by +0.9 °C between 1940 and 2025, or +0.10 °C per decade. This trend is statistically significant.

The hottest day of the period reached 37.4 °C (on 27 August 2023) and the coldest -9.9 °C (on 21 January 1985).

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

ChalmetteLouisiana

coords: 29.94°, -89.97°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJulyColdest monthJanuaryWettest monthAugustDriest monthOctober

Mean daily temperature

20.6°C

Average daily high

24.0°C

Average daily low

17.7°C

Annual rainfall

1,291mm

Sunshine / day

9.7h

Mean relative humidity

76%

Average peak wind

19.0km/h

Seasonal range

15.5°C

Frost days (< 0 °C)

2 d/yr

Hot days (≥ 30 °C)

71 d/yr

Rainy days (≥ 1 mm)

135 d/yr

Annual snowfall

0.4 cm

Average feels-like high

25.5 °C

Average feels-like low

17.9 °C

Average peak gust

34.2 km/h

Tropical nights (≥ 20 °C)

167 d/yr

Solar radiation

16.8 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+0.9 °C

since 1940

+0.1 °C per decade · r² = 0.20 · 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

37.4 °C

27 August 2023

Coldest day

-9.9 °C

21 January 1985

Wettest day

261 mm

29 August 2012

Windiest day

117.9 km/h

29 August 2005

Strongest gust

178.6 km/h

29 August 2005

Hottest feels-like

44.0 °C

30 July 1986

Coldest feels-like

-17.9 °C

23 December 1989

Snowiest day

9.4 cm

21 January 2025

Sunniest day

13.9 h

26 June 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	34.1 °C29 July 2025	-5.1 °C22 January 2025	21.5 °C	1,126 mm	105	5
2024	35.0 °C18 August 2024	-3.7 °C17 January 2024	22.0 °C	1,754 mm	99	2
2023	37.4 °C27 August 2023	2.8 °C20 March 2023	22.3 °C	1,036 mm	118	0
2022	34.8 °C24 June 2022	-3.0 °C24 December 2022	21.1 °C	1,418 mm	83	3
2021	33.7 °C23 August 2021	-3.3 °C16 February 2021	21.2 °C	2,035 mm	56	2
2020	34.4 °C12 July 2020	2.6 °C21 January 2020	21.7 °C	1,534 mm	75	0
2019	34.4 °C6 July 2019	0.8 °C13 November 2019	21.4 °C	1,356 mm	104	0
2018	34.0 °C22 July 2018	-5.4 °C17 January 2018	21.4 °C	1,597 mm	99	6
2017	33.5 °C28 July 2017	-1.4 °C7 January 2017	21.7 °C	1,600 mm	65	2
2016	34.2 °C1 September 2016	1.3 °C24 January 2016	21.6 °C	1,561 mm	86	0
2015	34.4 °C19 July 2015	-3.1 °C8 January 2015	21.6 °C	1,367 mm	84	1
2014	34.7 °C24 August 2014	-4.0 °C7 January 2014	20.1 °C	1,180 mm	77	6
2013	33.7 °C28 June 2013	2.0 °C3 March 2013	20.6 °C	1,540 mm	72	0
2012	34.5 °C25 June 2012	1.0 °C12 February 2012	21.6 °C	1,519 mm	69	0
2011	35.5 °C4 June 2011	-2.1 °C13 January 2011	21.2 °C	1,099 mm	92	1
2010	35.7 °C1 August 2010	-3.9 °C9 January 2010	20.2 °C	1,354 mm	96	6
2009	35.9 °C2 July 2009	0.4 °C21 January 2009	21.0 °C	1,355 mm	80	0
2008	34.2 °C28 July 2008	-1.4 °C3 January 2008	20.8 °C	1,343 mm	72	1
2007	34.9 °C11 August 2007	-0.2 °C16 February 2007	21.1 °C	976 mm	83	1
2006	35.1 °C15 August 2006	-0.7 °C8 December 2006	21.4 °C	862 mm	104	1
2005	33.0 °C24 July 2005	0.2 °C23 January 2005	20.9 °C	1,358 mm	85	0
2004	33.7 °C25 July 2004	0.3 °C24 December 2004	20.8 °C	1,348 mm	71	0
2003	32.0 °C22 July 2003	-3.0 °C24 January 2003	20.3 °C	1,256 mm	55	3
2002	33.3 °C21 July 2002	-2.1 °C4 January 2002	20.5 °C	1,566 mm	59	3
2001	32.5 °C21 July 2001	-1.7 °C2 January 2001	20.6 °C	1,323 mm	53	2
2000	36.4 °C29 August 2000	-0.9 °C20 December 2000	21.0 °C	853 mm	83	1
1999	34.5 °C3 August 1999	-1.3 °C4 January 1999	21.1 °C	882 mm	71	2
1998	35.6 °C1 August 1998	1.2 °C12 March 1998	21.4 °C	1,327 mm	96	0
1997	33.4 °C4 July 1997	-1.3 °C17 January 1997	20.3 °C	1,557 mm	78	1
1996	34.2 °C4 July 1996	-4.9 °C4 February 1996	20.3 °C	1,122 mm	65	10
1995	34.8 °C16 August 1995	-0.1 °C10 December 1995	20.8 °C	1,534 mm	87	1
1994	31.8 °C16 June 1994	-1.1 °C19 January 1994	20.5 °C	1,135 mm	41	1
1993	34.1 °C31 July 1993	1.1 °C14 March 1993	20.2 °C	1,453 mm	79	0
1992	33.7 °C6 July 1992	1.0 °C20 January 1992	20.3 °C	1,535 mm	54	0
1991	33.2 °C14 July 1991	1.2 °C16 February 1991	20.7 °C	1,826 mm	69	0
1990	35.7 °C5 August 1990	0.2 °C24 December 1990	21.3 °C	939 mm	99	0
1989	34.5 °C2 September 1989	-9.8 °C23 December 1989	20.4 °C	1,179 mm	71	6
1988	33.8 °C28 June 1988	-1.3 °C7 February 1988	20.1 °C	1,363 mm	60	2
1987	33.2 °C21 August 1987	-0.6 °C27 January 1987	20.1 °C	1,256 mm	58	1
1986	35.5 °C30 July 1986	-1.2 °C12 February 1986	20.8 °C	1,228 mm	85	2
1985	33.6 °C6 June 1985	-9.9 °C21 January 1985	20.5 °C	1,375 mm	61	7
1984	32.3 °C13 September 1984	-1.3 °C6 February 1984	20.2 °C	1,058 mm	44	4
1983	33.9 °C31 August 1983	-8.3 °C25 December 1983	19.5 °C	1,474 mm	53	5
1982	33.1 °C10 June 1982	-7.7 °C11 January 1982	20.8 °C	1,253 mm	87	5
1981	35.3 °C23 July 1981	-2.9 °C13 January 1981	20.5 °C	1,009 mm	82	4
1980	35.9 °C22 August 1980	-2.2 °C2 March 1980	20.5 °C	1,583 mm	94	3
1979	33.2 °C5 July 1979	-2.6 °C3 January 1979	19.9 °C	1,333 mm	51	8
1978	33.5 °C4 July 1978	-1.2 °C15 January 1978	19.9 °C	1,180 mm	77	3
1977	34.3 °C24 June 1977	-4.6 °C19 January 1977	20.4 °C	1,482 mm	86	5
1976	34.2 °C25 August 1976	-1.7 °C9 January 1976	19.7 °C	1,021 mm	62	1
1975	32.6 °C7 July 1975	-1.7 °C19 December 1975	20.7 °C	1,473 mm	50	1
1974	33.4 °C12 July 1974	1.4 °C26 February 1974	21.1 °C	1,134 mm	44	0
1973	33.8 °C10 July 1973	-1.7 °C13 January 1973	20.8 °C	1,494 mm	69	2
1972	34.1 °C27 June 1972	-1.2 °C16 January 1972	21.1 °C	1,093 mm	88	1
1971	34.0 °C24 June 1971	-1.0 °C10 February 1971	20.8 °C	944 mm	54	3
1970	34.3 °C3 July 1970	-3.4 °C7 January 1970	19.9 °C	1,196 mm	71	6
1969	34.7 °C29 June 1969	-1.3 °C5 January 1969	20.1 °C	1,102 mm	72	1
1968	33.3 °C28 July 1968	-1.2 °C14 January 1968	19.8 °C	742 mm	77	1
1967	33.6 °C27 June 1967	0.3 °C8 February 1967	20.4 °C	1,053 mm	44	0
1966	32.9 °C9 July 1966	-6.1 °C30 January 1966	19.8 °C	1,377 mm	51	3
1965	33.4 °C20 July 1965	-2.8 °C17 January 1965	20.6 °C	1,094 mm	52	1
1964	33.7 °C1 September 1964	-2.5 °C14 January 1964	20.2 °C	1,279 mm	67	4
1963	35.1 °C15 June 1963	-7.3 °C24 January 1963	20.3 °C	980 mm	84	8
1962	34.8 °C8 August 1962	-8.9 °C11 January 1962	20.6 °C	812 mm	94	6
1961	32.3 °C5 September 1961	-0.6 °C29 January 1961	19.9 °C	1,633 mm	28	1
1960	33.7 °C3 July 1960	-0.7 °C22 December 1960	19.7 °C	1,056 mm	78	2
1959	31.8 °C31 August 1959	-0.2 °C5 January 1959	20.1 °C	1,526 mm	37	1
1958	32.5 °C5 August 1958	-1.9 °C13 February 1958	19.7 °C	1,313 mm	61	5
1957	34.7 °C10 July 1957	-1.2 °C12 December 1957	20.9 °C	1,323 mm	57	2
1956	34.1 °C8 August 1956	2.8 °C13 January 1956	20.8 °C	1,177 mm	64	0
1955	34.2 °C23 August 1955	-0.8 °C16 December 1955	20.8 °C	1,016 mm	63	1
1954	36.0 °C30 June 1954	0.9 °C8 February 1954	20.8 °C	845 mm	89	0
1953	35.0 °C19 June 1953	1.7 °C24 December 1953	21.0 °C	1,537 mm	79	0
1952	34.5 °C24 July 1952	0.3 °C15 December 1952	20.6 °C	1,035 mm	78	0
1951	35.4 °C14 August 1951	-6.7 °C2 February 1951	20.9 °C	917 mm	95	5
1950	33.3 °C27 June 1950	-0.3 °C7 December 1950	20.9 °C	1,006 mm	65	1
1949	33.3 °C20 August 1949	0.6 °C31 January 1949	21.1 °C	1,792 mm	49	0
1948	33.4 °C13 August 1948	-3.9 °C18 January 1948	20.7 °C	1,895 mm	64	4
1947	35.2 °C6 August 1947	0.2 °C10 February 1947	20.5 °C	1,553 mm	56	0
1946	32.1 °C12 July 1946	1.4 °C23 January 1946	20.9 °C	1,688 mm	32	0
1945	33.7 °C24 June 1945	0.6 °C20 December 1945	21.2 °C	1,140 mm	71	0
1944	34.9 °C29 July 1944	3.2 °C9 January 1944	21.4 °C	1,344 mm	76	0
1943	36.5 °C26 August 1943	-0.1 °C3 March 1943	20.5 °C	1,332 mm	72	1
1942	33.7 °C13 July 1942	-1.2 °C11 January 1942	20.4 °C	1,019 mm	54	2
1941	33.0 °C10 August 1941	3.0 °C9 February 1941	20.1 °C	1,135 mm	51	0
1940	32.3 °C10 September 1940	-2.8 °C27 January 1940	19.6 °C	1,527 mm	33	6

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

25.0 °C

+1.0 °C

Hot days (≥ 30 °C)

105 d/yr

+34

Frost days (< 0 °C)

5 d/yr

Annual rainfall

1126 mm

-165 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	14.1 °C	-1.6 °C	86 mm	-21 mm
Feb	19.5 °C	+2.3 °C	143 mm	+33 mm
Mar	22.2 °C	+2.0 °C	124 mm	+1 mm
Apr	25.5 °C	+1.8 °C	77 mm	-20 mm
May	27.9 °C	+0.5 °C	179 mm	+89 mm
Jun	30.5 °C	+0.4 °C	85 mm	-20 mm
Jul	31.6 °C	+0.9 °C	127 mm	-10 mm
Aug	30.9 °C	+0.2 °C	125 mm	-13 mm
Sep	30.4 °C	+1.5 °C	17 mm	-108 mm
Oct	26.4 °C	+1.2 °C	106 mm	+36 mm
Nov	22.1 °C	+1.6 °C	6 mm	-81 mm
Dec	18.3 °C	+1.1 °C	52 mm	-51 mm

The year's extremes

Hottest day

34.1 °C

29 Jul 2025

Coldest day

-5.1 °C

22 Jan 2025

Wettest day

55.5 mm

9 May 2025

Windiest day

47.6 km/h

4 Mar 2025

Strongest gust

84.2 km/h

15 Mar 2025

Hottest feels-like

41.2 °C

28 Jul 2025

Coldest feels-like

-10.9 °C

22 Jan 2025

Snowiest day

9.4 cm

21 Jan 2025

Sunniest day

13.9 h

26 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 Chalmette?

Chalmette has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 20.6 °C and it receives 1,291 mm of precipitation per year.

What is the hottest day ever recorded in Chalmette?

The hottest day measured in Chalmette between 1940 and 2025 was 27 August 2023, reaching 37.4 °C.

What is the coldest day in Chalmette?

The coldest day measured in Chalmette between 1940 and 2025 was 21 January 1985, at -9.9 °C.

Does it snow in Chalmette?

Almost never: Chalmette sees virtually no snow, with about 2 frost days per year.

Has the climate of Chalmette warmed?

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

What is the wettest day in Chalmette?

The wettest day measured in Chalmette between 1940 and 2025 was 29 August 2012, with 261 mm of rain in 24 hours.

What was the windiest day in Chalmette?

The windiest day measured in Chalmette between 1940 and 2025 was 29 August 2005, with winds reaching 117.9 km/h.

What is the warmest month in Chalmette?

The warmest month in Chalmette is July (27.7 °C on average); the coldest is January (12.2 °C).

How much does it rain in Chalmette?

Chalmette receives on average 1,291 mm of precipitation per year, spread over about 135 rainy days.

Is it sunny in Chalmette?

Chalmette gets on average 9.7 hours of sunshine per day, roughly 3,540 hours per year over 1940-2025.

What is the biggest single-day snowfall in Chalmette?

The heaviest 24-hour snowfall measured in Chalmette between 1940 and 2025 was 21 January 2025, with 9.4 cm.

Are there tropical nights in Chalmette?

Yes: Chalmette has on average 167 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Chalmette?

In Chalmette, between 1940 and 2025, the highest apparent temperature reached 44.0 °C on 30 July 1986, and the lowest was -17.9 °C on 23 December 1989.

Compare Chalmette with another city

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The climate around Chalmette

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