Hanahan climate — normals and trends
Hanahan (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 18.3 °C and it receives 1,229 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 (9.0 °C). Rainfall peaks in August.
Hanahan averages 20 frost days, 83 hot days (≥ 30 °C) and 134 rainy days per year.
Hanahan 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 40.0 °C (on 17 August 1954) and the coldest -14.1 °C (on 25 December 1989).
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
HanahanSouth Carolina
- coords
- 32.92°, -80.02°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
18.3°C
Average daily high
23.7°C
Average daily low
13.9°C
Annual rainfall
1,229mm
Sunshine / day
9.5h
Mean relative humidity
75%
Average peak wind
15.3km/h
Seasonal range
17.9°C
Frost days (< 0 °C)
20 d/yr
Hot days (≥ 30 °C)
83 d/yr
Rainy days (≥ 1 mm)
134 d/yr
Annual snowfall
1.5 cm
Average feels-like high
24.8 °C
Average feels-like low
13.6 °C
Average peak gust
34.6 km/h
Tropical nights (≥ 20 °C)
115 d/yr
Solar radiation
16.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.9 °C
since 1940
+0.1 °C per decade · r² = 0.18 · 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
40.0 °C
17 August 1954
Coldest day
-14.1 °C
25 December 1989
Wettest day
205 mm
23 December 2019
Windiest day
77.1 km/h
21 September 1989
Strongest gust
158.0 km/h
22 September 1989
Hottest feels-like
45.4 °C
1 August 1999
Coldest feels-like
-19.4 °C
21 January 1985
Snowiest day
18.6 cm
10 February 1973
Sunniest day
13.8 h
27 June 2012
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 | 12.1 °C | -2.6 °C | 52 mm | -28 mm |
| Feb | 19.8 °C | +3.3 °C | 27 mm | -56 mm |
| Mar | 22.1 °C | +2.2 °C | 122 mm | +30 mm |
| Apr | 25.8 °C | +1.8 °C | 44 mm | -27 mm |
| May | 29.2 °C | +1.5 °C | 121 mm | +29 mm |
| Jun | 31.7 °C | +1.2 °C | 164 mm | +27 mm |
| Jul | 32.6 °C | +1.0 °C | 185 mm | +24 mm |
| Aug | 29.6 °C | -1.3 °C | 227 mm | +61 mm |
| Sep | 28.8 °C | +0.2 °C | 72 mm | -55 mm |
| Oct | 23.2 °C | -1.2 °C | 187 mm | +103 mm |
| Nov | 21.3 °C | +1.4 °C | 11 mm | -50 mm |
| Dec | 15.8 °C | -0.1 °C | 56 mm | -20 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 Hanahan?
Hanahan has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 18.3 °C and it receives 1,229 mm of precipitation per year.
What is the hottest day ever recorded in Hanahan?
The hottest day measured in Hanahan between 1940 and 2025 was 17 August 1954, reaching 40.0 °C.
What is the coldest day in Hanahan?
The coldest day measured in Hanahan between 1940 and 2025 was 25 December 1989, at -14.1 °C.
Does it snow in Hanahan?
Yes. Hanahan gets on average 1.5 cm of snow per year and has around 20 frost days.
Has the climate of Hanahan warmed?
Yes: Hanahan warmed by +0.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hanahan?
The wettest day measured in Hanahan between 1940 and 2025 was 23 December 2019, with 205 mm of rain in 24 hours.
What was the windiest day in Hanahan?
The windiest day measured in Hanahan between 1940 and 2025 was 21 September 1989, with winds reaching 77.1 km/h.
What is the warmest month in Hanahan?
The warmest month in Hanahan is July (26.9 °C on average); the coldest is January (9.0 °C).
How much does it rain in Hanahan?
Hanahan receives on average 1,229 mm of precipitation per year, spread over about 134 rainy days.
Is it sunny in Hanahan?
Hanahan 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 Hanahan?
The heaviest 24-hour snowfall measured in Hanahan between 1940 and 2025 was 10 February 1973, with 18.6 cm.
Are there tropical nights in Hanahan?
Yes: Hanahan has on average 115 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hanahan?
In Hanahan, between 1940 and 2025, the highest apparent temperature reached 45.4 °C on 1 August 1999, and the lowest was -19.4 °C on 21 January 1985.
Compare Hanahan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hanahan