Hattiesburg climate — normals and trends
Hattiesburg (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 18.8 °C and it receives 1,208 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 (26.9 °C on average) and the coldest is January (9.2 °C). Rainfall peaks in March.
Hattiesburg averages 22 frost days, 114 hot days (≥ 30 °C) and 130 rainy days per year.
Hattiesburg 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 40.7 °C (on 26 August 1943) and the coldest -15.1 °C (on 28 January 1940).
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
HattiesburgMississippi
- coords
- 31.33°, -89.29°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
18.8°C
Average daily high
24.7°C
Average daily low
13.8°C
Annual rainfall
1,208mm
Sunshine / day
9.3h
Mean relative humidity
73%
Average peak wind
13.5km/h
Seasonal range
17.7°C
Frost days (< 0 °C)
22 d/yr
Hot days (≥ 30 °C)
114 d/yr
Rainy days (≥ 1 mm)
130 d/yr
Annual snowfall
1.4 cm
Average feels-like high
25.8 °C
Average feels-like low
13.7 °C
Average peak gust
32.4 km/h
Tropical nights (≥ 20 °C)
117 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 = 0.22 · 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
40.7 °C
26 August 1943
Coldest day
-15.1 °C
28 January 1940
Wettest day
162 mm
28 September 1998
Windiest day
70.3 km/h
29 August 2005
Strongest gust
173.2 km/h
29 August 2005
Hottest feels-like
45.8 °C
2 August 2010
Coldest feels-like
-20.8 °C
21 January 1985
Snowiest day
11.6 cm
12 March 1993
Sunniest day
14.0 h
21 June 1940
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 | 13.6 °C | -1.3 °C | 74 mm | -33 mm |
| Feb | 20.3 °C | +3.2 °C | 108 mm | -1 mm |
| Mar | 23.5 °C | +2.6 °C | 99 mm | -29 mm |
| Apr | 26.9 °C | +2.0 °C | 75 mm | -29 mm |
| May | 28.8 °C | -0.1 °C | 215 mm | +118 mm |
| Jun | 32.2 °C | +0.3 °C | 108 mm | +13 mm |
| Jul | 33.3 °C | +0.8 °C | 79 mm | -41 mm |
| Aug | 33.0 °C | +0.4 °C | 119 mm | +16 mm |
| Sep | 32.8 °C | +2.4 °C | 14 mm | -76 mm |
| Oct | 27.7 °C | +1.7 °C | 81 mm | +15 mm |
| Nov | 22.1 °C | +1.9 °C | 24 mm | -60 mm |
| Dec | 17.2 °C | +0.9 °C | 59 mm | -47 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 Hattiesburg?
Hattiesburg has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 18.8 °C and it receives 1,208 mm of precipitation per year.
What is the hottest day ever recorded in Hattiesburg?
The hottest day measured in Hattiesburg between 1940 and 2025 was 26 August 1943, reaching 40.7 °C.
What is the coldest day in Hattiesburg?
The coldest day measured in Hattiesburg between 1940 and 2025 was 28 January 1940, at -15.1 °C.
Does it snow in Hattiesburg?
Yes. Hattiesburg gets on average 1.4 cm of snow per year and has around 22 frost days.
Has the climate of Hattiesburg warmed?
Yes: Hattiesburg warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hattiesburg?
The wettest day measured in Hattiesburg between 1940 and 2025 was 28 September 1998, with 162 mm of rain in 24 hours.
What was the windiest day in Hattiesburg?
The windiest day measured in Hattiesburg between 1940 and 2025 was 29 August 2005, with winds reaching 70.3 km/h.
What is the warmest month in Hattiesburg?
The warmest month in Hattiesburg is July (26.9 °C on average); the coldest is January (9.2 °C).
How much does it rain in Hattiesburg?
Hattiesburg receives on average 1,208 mm of precipitation per year, spread over about 130 rainy days.
Is it sunny in Hattiesburg?
Hattiesburg gets on average 9.3 hours of sunshine per day, roughly 3,395 hours per year over 1940-2025.
What is the biggest single-day snowfall in Hattiesburg?
The heaviest 24-hour snowfall measured in Hattiesburg between 1940 and 2025 was 12 March 1993, with 11.6 cm.
Are there tropical nights in Hattiesburg?
Yes: Hattiesburg has on average 117 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hattiesburg?
In Hattiesburg, between 1940 and 2025, the highest apparent temperature reached 45.8 °C on 2 August 2010, and the lowest was -20.8 °C on 21 January 1985.
Compare Hattiesburg with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hattiesburg