San Juan County Climate
San Juan County, Utah
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
52.9°F
Annual Precip
10.7"
Annual Snowfall
25.3"
Extreme Heat Days
57
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
3,433
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: San Juan County
Climate Verdict
San Juan County has a mild, with an average annual temperature of 52.9°F, arid conditions receiving just 10.7 inches of precipitation annually, occasional hot days — 57.01818181818182 per year above 90°F, moderate snowfall of 25.3 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 30.4°F. summers are warm — July averages 77.3°F. The 47°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for San Juan County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
San Juan County is 4.1°F warmer than the Utah statewide average of 48.9°F, it is somewhat drier than average for Utah.
Climate Profile
About San Juan County Weather
A Typical High Desert Profile
San Juan County's average temperature of 52.9°F aligns closely with the national median. This high-desert region combines moderate annual averages with sharp daily temperature swings.
Warm and Arid Southeast Corner
The county ranks as one of Utah's warmer regions, exceeding the state average of 48.9°F by four degrees. It is significantly drier than the state average, receiving only 10.7 inches of precipitation annually.
Drier than the Interior Basin
San Juan is warmer and drier than its northern neighbors in the interior. Its 25.3 inches of snow is less than half of what Sanpete County receives further to the northwest.
Scorching Summers and Dry Winters
Summers are characterized by 57 days of extreme heat reaching 90°F or higher. Winters are relatively dry and mild for Utah, with a January average of 30.4°F and limited snowfall.
Prioritize Cooling and Water
Cooling systems are a priority to handle nearly two months of extreme summer heat. Residents should also invest in xeriscaping and water storage solutions due to the low 10.7 inches of annual rainfall.
Frequently Asked Questions
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Track your own weather in San Juan County
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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.