Custer County Climate
Custer County, Colorado
Avg Annual Temp
42.8°F
Annual Precip
13.6"
Annual Snowfall
84.3"
Extreme Heat Days
1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Custer County Weather
Custer: High-Altitude Mountain County
At 42.8°F, Custer County is approximately 6.7 degrees colder than the U.S. median of 49.5°F, placing it among the nation's coldest counties. Its 13.6 inches of annual precipitation fall below the national median of 15.2 inches, though high elevation transforms most moisture into snow. This is true alpine-to-subalpine climate, shaped by Custer County's location in the Sangre de Cristo Mountains.
Custer: Cold Mountain County South-Central Colorado
Custer County's 42.8°F average ranks 3.2 degrees below Colorado's state average of 46.0°F, while its 13.6 inches of precipitation fall below the state mean. The county sits in one of Colorado's highest and most remote mountain valleys, where terrain and elevation override regional weather patterns. Its climate is colder than nearby lower-elevation counties but less extreme than the highest peaks.
Cold Valley Surrounded by Higher Peaks
Custer County is cooler than Fremont County to the west (which benefits from lower elevation along the Arkansas River) and significantly colder than Huerfano County to the east. Its 42.8°F average closely matches Conejos County (43.8°F) and Costilla County (43.8°F) to the south, though Custer receives more precipitation due to topography. The county is notably warmer than Clear Creek County (39.9°F) because it sits at slightly lower elevation.
Alpine Cold, Heavy Snow, No Heat Days
Custer County experiences zero days above 90°F, with July averaging just 62.8°F and January dropping to 23.9°F. Annual snowfall totals 84.3 inches—among Colorado's highest—accumulating from October through May and persisting at higher elevations through summer. The persistent cool temperatures and extended snow season make this a winter-dominated climate.
Build for Snow, Maintain Mountain Roads
Residents must invest in serious heating systems, avalanche safety awareness, and vehicles capable of handling 84+ inches of annual snow and challenging mountain passes. The county's remote location means emergency supplies should include extended heating fuel, food, and medical provisions for isolation periods during winter storms. Summer recreation thrives in brief warm spells; plan outdoor activities for June through August when conditions permit, and maintain year-round vigilance for rapidly changing mountain weather.
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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.