Mountain Brook, AL climate
Mountain Brook has mild winters and warm summers, with plenty of rain. A typical July afternoon reaches 90°, a January night drops to 33°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Mountain Brook feels like
Winter
Spring
Summer
Fall
Mountain Brook weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 54° | 33° | 5.3" | 0 | 8 | 0 | 35° – 51° |
| February | 59° | 36° | 5.5" | 0 | 8 | 0 | 39° – 56° |
| March | 67° | 43° | 5.5" | 0 | 8 | 0 | 49° – 64° |
| April | 75° | 49° | 5.1" | 0 | 7 | 0 | 58° – 67° |
| May | 82° | 58° | 4.4" | 0 | 7 | 0 | 65° – 74° |
| June | 88° | 66° | 5.2" | 0 | 9 | 0 | 73° – 81° |
| July | 90° | 70° | 5.0" | 0 | 8 | 0 | 77° – 83° |
| August | 90° | 69° | 4.3" | 0 | 7 | 0 | 75° – 85° |
| September | 85° | 63° | 4.1" | 0 | 6 | 0 | 71° – 80° |
| October | 75° | 51° | 3.4" | 0 | 6 | 0 | 59° – 69° |
| November | 65° | 41° | 4.6" | 0 | 6 | 0 | 47° – 58° |
| December | 57° | 36° | 5.1" | 0 | 8 | 0 | 37° – 55° |
| Year | 74° | 51° | 57.5" | 0.0" | 88 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Mountain Brook
Mountain Brook gets 57 inches of rain and melted snow a year. March is the wettest month and October the driest. Rain or snow falls on about 88 days a year.
About 236 frost-free days a year
In half of years the last 32° night comes by March 21 and the first one by November 11. That leaves about 236 frost-free days for gardens, longer than 87% of U.S. towns.
Heating and cooling a home in Mountain Brook
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Mountain Brook, 54% of that work is heating and 46% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Mountain Brook and its neighbors
Mountain Brook borders 4 towns with climate data. January nights across them vary by 0.9°. Irondale has the coldest January nights (33°) and Birmingham the hottest July afternoons (91°). Mountain Brook’s January low is 33° and its July high 90°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Mountain Brook compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Mountain Brook averaged 1.0° warmer than the 1900s. The biggest change is in February (+1.8°). The shift is smaller than in 69% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Mountain Brook’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 37° to 55°. July is the most reliable, staying within 6°.
Common questions about Mountain Brook’s climate
What is the coldest month in Mountain Brook?
January, with a typical high of 54° and a low of 33°.
What is the hottest month in Mountain Brook?
July, with a typical high of 90° and a low of 70°. About 65 days a year reach 90°.
How much snow does Mountain Brook get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Mountain Brook?
In half of years the first 32° night comes by November 11, and the last spring frost by March 21.
What is the rainiest month in Mountain Brook?
March, with 5.5 inches of rain and melted snow. The year totals 57 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Mountain Brook itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Leeds, AL (9 mi, snow) and Birmingham Airport, AL (5 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.