Washington County Climate
Washington County, Utah
Avg Annual Temp
58.0°F
Annual Precip
13.6"
Annual Snowfall
10.9"
Extreme Heat Days
90.3714285714286
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.