Johnson County Climate
Johnson County, Wyoming
Avg Annual Temp
45.1°F
Annual Precip
13.7"
Annual Snowfall
39.7"
Extreme Heat Days
26.9
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Johnson County Weather
High Altitude and Dry Air
Johnson County maintains an average annual temperature of 45.1°F, reflecting its position in the cool, dry interior of the Mountain West. Precipitation is sparse, with only 13.7 inches of moisture annually.
Classic Wyoming Weather Patterns
At 45.1°F, the county is roughly 1.3 degrees warmer than the statewide average of 43.8°F. It is one of several central-northern counties that experience slightly more temperate conditions than the state's highest peaks.
Temperatures Close to Local Peers
Johnson County is slightly cooler than neighboring Natrona County to the south, which averages 45.7°F. It mirrors the general climate of the Big Horn Basin but with slightly more moisture than Hot Springs County.
Predictable Heat and Moderate Snow
July brings an average of 70.2°F and 27 days of extreme heat over 90°F. Winter delivers a manageable 39.7 inches of snowfall, which is relatively low for Wyoming's mountainous regions.
Planning for Arid Conditions
With only 13.7 inches of annual precipitation, water conservation and xeriscaping are practical choices for residents. Winter gear should focus on wind protection as January temperatures average a brisk 24.9°F.
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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.