Alamosa County Climate
Alamosa County, Colorado
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
42.5°F
Annual Precip
8.7"
Annual Snowfall
34.5"
Extreme Heat Days
2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
1,500
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Alamosa County
Climate Verdict
Alamosa County has a cool, averaging 42.5°F annually, arid conditions receiving just 8.7 inches of precipitation annually, rare extreme heat with only 2.05 days above 90°F annually, moderate snowfall of 34.5 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 17.9°F. summers are pleasantly cool with July averaging 64.8°F. The 47°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Alamosa County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Alamosa County is 3.4°F cooler than the Colorado statewide average of 45.9°F, it is also noticeably drier, receiving 7.5 inches less precipitation than the state average, the county experiences 24.566034265558066 fewer extreme heat days than the state average.
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.
Frequently Asked Questions
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Data sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.