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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 28°C, while the coldest is January averaging around −18°C at night. Precipitation totals about 184 mm a year and is strongly seasonal — August alone averages 36 mm while December barely receives 6 mm. Winters bring significant snowfall (76 cm 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 (°C) | 2 | 6 | 12 | 15 | 21 | 26 | 28 | 27 | 24 | 18 | 10 | 3 |
| Avg temp (°C) | −8 | −4 | 2 | 6 | 11 | 16 | 19 | 17 | 13 | 7 | 0 | −7 |
| Avg low (°C) | −18 | −14 | −8 | −4 | 1 | 5 | 9 | 7 | 3 | −4 | −11 | −17 |
| Precipitation (mm) | 10 | 7 | 12 | 13 | 17 | 7 | 29 | 36 | 24 | 15 | 9 | 6 |
| Snowfall (cm) | 18 | 11 | 11 | 11 | 2 | — | — | — | — | 5 | 8 | 11 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 2 | 6 | 12 | 15 | 21 | 26 |
| Avg temp (°C) | −8 | −4 | 2 | 6 | 11 | 16 |
| Avg low (°C) | −18 | −14 | −8 | −4 | 1 | 5 |
| Precipitation (mm) | 10 | 7 | 12 | 13 | 17 | 7 |
| Snowfall (cm) | 18 | 11 | 11 | 11 | 2 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 27 | 24 | 18 | 10 | 3 |
| Avg temp (°C) | 19 | 17 | 13 | 7 | 0 | −7 |
| Avg low (°C) | 9 | 7 | 3 | −4 | −11 | −17 |
| Precipitation (mm) | 29 | 36 | 24 | 15 | 9 | 6 |
| Snowfall (cm) | — | — | — | 5 | 8 | 11 |
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 ≥ 32°C (days) | — | — | — | — | — | 1 | 1 | 0.4 | 0.1 | — | — | — |
| Days with low ≤ 0°C (days) | 29 | 26 | 29 | 24 | 12 | 1 | — | 0.2 | 7 | 23 | 29 | 31 |
| Days with snowfall ≥ 2.5 cm (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 ≥ 32°C (days) | — | — | — | — | — | 1 |
| Days with low ≤ 0°C (days) | 29 | 26 | 29 | 24 | 12 | 1 |
| Days with snowfall ≥ 2.5 cm (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 ≥ 32°C (days) | 1 | 0.4 | 0.1 | — | — | — |
| Days with low ≤ 0°C (days) | — | 0.2 | 7 | 23 | 29 | 31 |
| Days with snowfall ≥ 2.5 cm (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 (m/s) | 2.1 | 2.4 | 2.5 | 2.6 | 2.3 | 2.1 | 1.5 | 1.4 | 1.7 | 1.9 | 2.0 | 2.0 |
| 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 (m/s) | 2.1 | 2.4 | 2.5 | 2.6 | 2.3 | 2.1 |
| 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 (m/s) | 1.5 | 1.4 | 1.7 | 1.9 | 2.0 | 2.0 |
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.