Alamosa County Climate
Alamosa County, Colorado
Avg Annual Temp
42.5°F
Annual Precip
8.7"
Annual Snowfall
34.5"
Extreme Heat Days
2.05
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Alamosa County Weather
Alamosa: A high-altitude chill
Alamosa County averages just 42.5°F annually, sitting 3.5 degrees below the U.S. median of 46°F. The county receives only 8.7 inches of precipitation yearly—among the driest in Colorado—creating a cold-desert climate typical of high-elevation valleys.
Among Colorado's coldest counties
Alamosa's 42.5°F average ranks it 3.5 degrees colder than Colorado's state average of 46°F, placing it firmly in the mountain county tier. This reflects its San Luis Valley elevation and distance from lower-elevation plains.
Valley isolation creates unique cold
Alamosa (42.5°F) is noticeably colder than nearby Chaffee County (45.5°F) and significantly cooler than Denver-area counties like Adams (50.7°F). The San Luis Valley's geography traps cold air and limits moderating influences from lower elevations.
Frigid winters, cool summers
January lows average 17.9°F while July peaks reach only 64.8°F, with extremely rare heat days—just 2 days per year hit 90°F. Annual snowfall of 34.5 inches reflects the valley's continental mountain climate and long cold season.
Embrace the cold, plan accordingly
Residents need heavy-duty heating systems for sustained subzero stretches and well-insulated homes—cooling costs are minimal with only occasional 90°F days. Winter recreation and seasonal preparation dominate the calendar; spring outdoor work usually waits until May.
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.