Hammond climate — normals and trends
Hammond (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 19.5 °C and it receives 1,352 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 (27.1 °C on average) and the coldest is January (10.5 °C). Rainfall peaks in July.
Hammond averages 14 frost days, 109 hot days (≥ 30 °C) and 138 rainy days per year.
Hammond has warmed by +1.1 °C between 1940 and 2025, or +0.13 °C per decade. This trend is statistically significant.
The hottest day of the period reached 40.3 °C (on 26 August 2023) and the coldest -15.0 °C (on 22 January 2025).
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
HammondLouisiana
- coords
- 30.50°, -90.46°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
19.5°C
Average daily high
24.9°C
Average daily low
14.8°C
Annual rainfall
1,352mm
Sunshine / day
9.5h
Mean relative humidity
76%
Average peak wind
13.7km/h
Seasonal range
16.6°C
Frost days (< 0 °C)
14 d/yr
Hot days (≥ 30 °C)
109 d/yr
Rainy days (≥ 1 mm)
138 d/yr
Annual snowfall
0.8 cm
Average feels-like high
26.6 °C
Average feels-like low
15.0 °C
Average peak gust
32.6 km/h
Tropical nights (≥ 20 °C)
132 d/yr
Solar radiation
16.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.24 · p = < 0.001
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
40.3 °C
26 August 2023
Coldest day
-15.0 °C
22 January 2025
Wettest day
243 mm
29 August 2012
Windiest day
72.9 km/h
29 August 2005
Strongest gust
168.5 km/h
29 August 2005
Hottest feels-like
45.8 °C
30 July 1986
Coldest feels-like
-20.1 °C
22 January 2025
Snowiest day
11.4 cm
11 December 2008
Sunniest day
13.9 h
26 June 2025
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?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 14.4 °C | -1.4 °C | 85 mm | -30 mm |
| Feb | 20.4 °C | +2.5 °C | 141 mm | +26 mm |
| Mar | 24.0 °C | +2.7 °C | 132 mm | +0 mm |
| Apr | 26.6 °C | +1.6 °C | 101 mm | -17 mm |
| May | 28.6 °C | -0.1 °C | 225 mm | +116 mm |
| Jun | 31.4 °C | -0.1 °C | 117 mm | +9 mm |
| Jul | 32.6 °C | +0.5 °C | 134 mm | -8 mm |
| Aug | 32.7 °C | +0.5 °C | 101 mm | -32 mm |
| Sep | 32.3 °C | +2.1 °C | 29 mm | -79 mm |
| Oct | 28.0 °C | +1.8 °C | 137 mm | +63 mm |
| Nov | 22.7 °C | +1.8 °C | 14 mm | -80 mm |
| Dec | 18.5 °C | +1.3 °C | 56 mm | -50 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Hammond?
Hammond has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 19.5 °C and it receives 1,352 mm of precipitation per year.
What is the hottest day ever recorded in Hammond?
The hottest day measured in Hammond between 1940 and 2025 was 26 August 2023, reaching 40.3 °C.
What is the coldest day in Hammond?
The coldest day measured in Hammond between 1940 and 2025 was 22 January 2025, at -15.0 °C.
Does it snow in Hammond?
Almost never: Hammond sees virtually no snow, with about 14 frost days per year.
Has the climate of Hammond warmed?
Yes: Hammond warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hammond?
The wettest day measured in Hammond between 1940 and 2025 was 29 August 2012, with 243 mm of rain in 24 hours.
What was the windiest day in Hammond?
The windiest day measured in Hammond between 1940 and 2025 was 29 August 2005, with winds reaching 72.9 km/h.
What is the warmest month in Hammond?
The warmest month in Hammond is July (27.1 °C on average); the coldest is January (10.5 °C).
How much does it rain in Hammond?
Hammond receives on average 1,352 mm of precipitation per year, spread over about 138 rainy days.
Is it sunny in Hammond?
Hammond gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.
What is the biggest single-day snowfall in Hammond?
The heaviest 24-hour snowfall measured in Hammond between 1940 and 2025 was 11 December 2008, with 11.4 cm.
Are there tropical nights in Hammond?
Yes: Hammond has on average 132 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hammond?
In Hammond, between 1940 and 2025, the highest apparent temperature reached 45.8 °C on 30 July 1986, and the lowest was -20.1 °C on 22 January 2025.
Compare Hammond with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hammond