Alamosa, CO climate
Alamosa has cold, snowy winters and pleasant summers, with very little rain. A typical July afternoon reaches 82°, a January night drops to 3°, and about 30 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Alamosa feels like
Winter
Spring
Summer
Fall
Alamosa 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 | 35° | 3° | 0.3" | 6.9" | 4 | 20 | 7° – 29° |
| February | 41° | 10° | 0.3" | 4.2" | 3 | 11 | 16° – 35° |
| March | 52° | 20° | 0.6" | 4.3" | 4 | 2 | 32° – 42° |
| April | 60° | 26° | 0.6" | 4.5" | 4 | 2 | 38° – 48° |
| May | 69° | 35° | 0.7" | 0.8" | 6 | 1 | 48° – 56° |
| June | 79° | 42° | 0.5" | 0 | 4 | 0 | 57° – 65° |
| July | 82° | 48° | 1.3" | 0 | 11 | 0 | 62° – 68° |
| August | 80° | 47° | 1.5" | 0 | 9 | 0 | 60° – 66° |
| September | 74° | 39° | 1.0" | 0 | 7 | 0 | 52° – 59° |
| October | 63° | 27° | 0.7" | 2.0" | 4 | 1 | 40° – 50° |
| November | 49° | 15° | 0.4" | 3.1" | 3 | 2 | 24° – 40° |
| December | 36° | 5° | 0.4" | 4.2" | 5 | 12 | 10° – 30° |
| Year | 60° | 26° | 8.4" | 30.0" | 64 | 51 |
“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 Alamosa
Alamosa gets 8 inches of rain and melted snow a year. August is the wettest month and February the driest. Rain or snow falls on about 64 days a year. Snow covers the ground about 51 days of the year.
About 108 frost-free days a year
In half of years the last 32° night comes by May 30 and the first one by September 17. That leaves about 108 frost-free days for gardens, shorter than 99% of U.S. towns.
Heating and cooling a home in Alamosa
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Alamosa, 99% of that work is heating and 1% is cooling, so the furnace matters far more than the air conditioner.
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.
How Alamosa 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 Alamosa averaged 1.4° warmer than the 1900s. The biggest change is in March (+3.2°). The shift is larger than in 67% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Alamosa’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. January swings the most: between 1991 and 2020 its average temperature ranged from 7° to 29°. August is the most reliable, staying within 6°.
Common questions about Alamosa’s climate
What is the coldest month in Alamosa?
January, with a typical high of 35° and a low of 3°.
What is the hottest month in Alamosa?
July, with a typical high of 82° and a low of 48°. About 3 days a year reach 90°.
How much snow does Alamosa get?
About 30 inches in a normal winter, most of it in January.
When is the first frost in Alamosa?
In half of years the first 32° night comes by September 17, and the last spring frost by May 30.
What is the rainiest month in Alamosa?
August, with 1.5 inches of rain and melted snow. The year totals 8 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Alamosa itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Alamosa 1e, CO (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.