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Alamosa, Colorado climate
BSk Cold semi-arid
Alamosa has a strongly seasonal cold-temperate climate (Cold semi-arid, Köppen BSk). The hottest month is July with an average daily high near 83°F, while the coldest is January averaging around 0°F at night. Precipitation totals about 7 inches a year and is strongly seasonal — August alone averages 1.4 inches while December barely receives 0.23 inches. Winters bring significant snowfall (30 inches of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Alamosa climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 35 | 43 | 53 | 59 | 69 | 79 | 83 | 80 | 75 | 64 | 51 | 37 |
| Avg temp (°F) | 17 | 25 | 35 | 42 | 52 | 61 | 65 | 63 | 56 | 45 | 32 | 20 |
| Avg low (°F) | 0 | 7 | 17 | 26 | 34 | 42 | 48 | 45 | 37 | 25 | 13 | 2 |
| Precipitation (in) | 0.4 | 0.3 | 0.5 | 0.5 | 0.7 | 0.3 | 1.2 | 1.4 | 0.9 | 0.6 | 0.4 | 0.2 |
| Snowfall (in) | 6.9 | 4.2 | 4.3 | 4.5 | 0.8 | — | — | — | — | 2.0 | 3.1 | 4.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 35 | 43 | 53 | 59 | 69 | 79 |
| Avg temp (°F) | 17 | 25 | 35 | 42 | 52 | 61 |
| Avg low (°F) | 0 | 7 | 17 | 26 | 34 | 42 |
| Precipitation (in) | 0.4 | 0.3 | 0.5 | 0.5 | 0.7 | 0.3 |
| Snowfall (in) | 6.9 | 4.2 | 4.3 | 4.5 | 0.8 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 83 | 80 | 75 | 64 | 51 | 37 |
| Avg temp (°F) | 65 | 63 | 56 | 45 | 32 | 20 |
| Avg low (°F) | 48 | 45 | 37 | 25 | 13 | 2 |
| Precipitation (in) | 1.2 | 1.4 | 0.9 | 0.6 | 0.4 | 0.2 |
| Snowfall (in) | — | — | — | 2.0 | 3.1 | 4.2 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 3 | 4 | 4 | 5 | 3 | 10 | 9 | 7 | 4 | 3 | 5 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | 1 | 1 | 0.4 | 0.1 | — | — | — |
| Days with low ≤ 32°F (days) | 29 | 26 | 29 | 24 | 12 | 1 | — | 0.2 | 7 | 23 | 29 | 31 |
| Days with snowfall ≥ 1 in (days) | 2 | 1 | 1 | 1 | 0.3 | — | — | — | 0.1 | 0.5 | 1 | 2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 3 | 4 | 4 | 5 | 3 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | 1 |
| Days with low ≤ 32°F (days) | 29 | 26 | 29 | 24 | 12 | 1 |
| Days with snowfall ≥ 1 in (days) | 2 | 1 | 1 | 1 | 0.3 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 7 | 4 | 3 | 5 |
| Days with high ≥ 90°F (days) | 1 | 0.4 | 0.1 | — | — | — |
| Days with low ≤ 32°F (days) | — | 0.2 | 7 | 23 | 29 | 31 |
| Days with snowfall ≥ 1 in (days) | — | — | 0.1 | 0.5 | 1 | 2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 60 | 56 | 53 | 55 | 51 | 42 | 54 | 54 | 41 | 39 | 45 | 55 |
| Relative humidity (%) | 70 | 65 | 58 | 52 | 47 | 41 | 49 | 53 | 50 | 51 | 58 | 68 |
| Wind speed (mph) | 4.6 | 5.3 | 5.5 | 5.8 | 5.1 | 4.6 | 3.4 | 3.2 | 3.7 | 4.2 | 4.4 | 4.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 60 | 56 | 53 | 55 | 51 | 42 |
| Relative humidity (%) | 70 | 65 | 58 | 52 | 47 | 41 |
| Wind speed (mph) | 4.6 | 5.3 | 5.5 | 5.8 | 5.1 | 4.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 54 | 54 | 41 | 39 | 45 | 55 |
| Relative humidity (%) | 49 | 53 | 50 | 51 | 58 | 68 |
| Wind speed (mph) | 3.4 | 3.2 | 3.7 | 4.2 | 4.4 | 4.5 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Alamosa 1E (NOAA GHCN station USC00050128), about 1 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.