Washington County Climate
Washington County, Utah
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
58.0°F
Annual Precip
13.6"
Annual Snowfall
10.9"
Extreme Heat Days
90
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
4,339
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Washington County
Climate Verdict
Washington County has a mild, with an average annual temperature of 58.0°F, arid conditions receiving just 13.6 inches of precipitation annually, significant summer heat with 90.3714285714286 days annually above 90°F, light snow averaging 10.9 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 38.5°F. summers are hot, with July averaging 80.5°F. The 42°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Summer outdoor activities should be planned for early morning or evening to avoid extreme heat.
Regional Context
Washington County is 9.2°F warmer than the Utah statewide average of 48.9°F, the county experiences 47.35271047917603 more extreme heat days than the state average.
Climate Profile
About Washington County Weather
Warm Desert Living in Southern Utah
Washington County’s 58.0°F average annual temperature is much higher than the national median. This desert climate is defined by intense heat and a low 13.6 inches of annual precipitation.
Utah's Warmest Regional Climate
The county ranks as the warmest in the state, sitting nearly 10 degrees above the Utah average of 48.9°F. While the rest of the state faces heavy snow, this region remains largely arid and hot.
Starkly Different from the North
Washington County is a world apart from Wayne County, which is nearly 8 degrees cooler and even drier. It experiences 90 heat days a year, double the amount seen in most central Utah counties.
Intense Heat and Mild Winters
Summers are scorching with a July average of 80.5°F and three full months of days over 90°F. Conversely, winters are the mildest in the state, featuring a 38.5°F January average and only 10.9 inches of snow.
Prioritize Cooling and Hydration
High-efficiency air conditioning and sun protection are critical for managing 90 days of extreme heat. Residents enjoy a year-round outdoor lifestyle that rarely requires the heavy winter gear used elsewhere in Utah.
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.