Johnson County Climate
Johnson County, Wyoming
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
45.1°F
Annual Precip
13.7"
Annual Snowfall
39.7"
Extreme Heat Days
27
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,092
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Johnson County
Climate Verdict
Johnson County has a cool, averaging 45.1°F annually, arid conditions receiving just 13.7 inches of precipitation annually, occasional hot days — 26.9 per year above 90°F, moderate snowfall of 39.7 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 24.9°F. summers are warm — July averages 70.2°F. The 45°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Johnson County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Johnson County closely matches the Wyoming statewide average temperature of 43.8°F.
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.
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.