Mountain Brook climate — normals and trends
Mountain Brook (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.9 °C and it receives 1,282 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 (26.4 °C on average) and the coldest is January (6.3 °C). Rainfall peaks in March.
Mountain Brook averages 40 frost days, 84 hot days (≥ 30 °C) and 125 rainy days per year.
Mountain Brook 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 39.8 °C (on 13 July 1980) and the coldest -20.8 °C (on 30 January 1966).
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
Mountain BrookAlabama
- coords
- 33.50°, -86.75°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.9°C
Average daily high
22.5°C
Average daily low
11.9°C
Annual rainfall
1,282mm
Sunshine / day
9.2h
Mean relative humidity
71%
Average peak wind
13.9km/h
Seasonal range
20.1°C
Frost days (< 0 °C)
40 d/yr
Hot days (≥ 30 °C)
84 d/yr
Rainy days (≥ 1 mm)
125 d/yr
Annual snowfall
4.5 cm
Average feels-like high
22.9 °C
Average feels-like low
11.0 °C
Average peak gust
33.1 km/h
Tropical nights (≥ 20 °C)
92 d/yr
Solar radiation
16.2 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
39.8 °C
13 July 1980
Coldest day
-20.8 °C
30 January 1966
Wettest day
106 mm
16 March 1990
Windiest day
48.5 km/h
16 September 2004
Strongest gust
133.2 km/h
5 October 1995
Hottest feels-like
44.0 °C
16 July 1980
Coldest feels-like
-26.7 °C
30 January 1966
Snowiest day
27.2 cm
13 March 1993
Sunniest day
13.9 h
12 July 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 | 10.3 °C | -1.2 °C | 78 mm | -49 mm |
| Feb | 17.4 °C | +3.3 °C | 120 mm | -6 mm |
| Mar | 21.5 °C | +3.2 °C | 133 mm | -14 mm |
| Apr | 25.2 °C | +2.4 °C | 108 mm | -9 mm |
| May | 26.1 °C | -0.7 °C | 269 mm | +167 mm |
| Jun | 30.2 °C | -0.3 °C | 171 mm | +80 mm |
| Jul | 32.3 °C | +0.7 °C | 65 mm | -49 mm |
| Aug | 29.8 °C | -1.6 °C | 88 mm | +3 mm |
| Sep | 30.4 °C | +1.7 °C | 50 mm | -36 mm |
| Oct | 24.0 °C | +0.3 °C | 89 mm | +15 mm |
| Nov | 19.3 °C | +1.7 °C | 46 mm | -53 mm |
| Dec | 14.4 °C | +1.3 °C | 47 mm | -69 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 Mountain Brook?
Mountain Brook has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.9 °C and it receives 1,282 mm of precipitation per year.
What is the hottest day ever recorded in Mountain Brook?
The hottest day measured in Mountain Brook between 1940 and 2025 was 13 July 1980, reaching 39.8 °C.
What is the coldest day in Mountain Brook?
The coldest day measured in Mountain Brook between 1940 and 2025 was 30 January 1966, at -20.8 °C.
Does it snow in Mountain Brook?
Yes. Mountain Brook gets on average 4.5 cm of snow per year and has around 40 frost days.
Has the climate of Mountain Brook warmed?
Yes: Mountain Brook warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Mountain Brook?
The wettest day measured in Mountain Brook between 1940 and 2025 was 16 March 1990, with 106 mm of rain in 24 hours.
What was the windiest day in Mountain Brook?
The windiest day measured in Mountain Brook between 1940 and 2025 was 16 September 2004, with winds reaching 48.5 km/h.
What is the warmest month in Mountain Brook?
The warmest month in Mountain Brook is July (26.4 °C on average); the coldest is January (6.3 °C).
How much does it rain in Mountain Brook?
Mountain Brook receives on average 1,282 mm of precipitation per year, spread over about 125 rainy days.
Is it sunny in Mountain Brook?
Mountain Brook gets on average 9.2 hours of sunshine per day, roughly 3,358 hours per year over 1940-2025.
What is the biggest single-day snowfall in Mountain Brook?
The heaviest 24-hour snowfall measured in Mountain Brook between 1940 and 2025 was 13 March 1993, with 27.2 cm.
Are there tropical nights in Mountain Brook?
Yes: Mountain Brook has on average 92 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Mountain Brook?
In Mountain Brook, between 1940 and 2025, the highest apparent temperature reached 44.0 °C on 16 July 1980, and the lowest was -26.7 °C on 30 January 1966.
Compare Mountain Brook with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Mountain Brook