Johnson County Climate
Johnson County, Kansas
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
55.1°F
Annual Precip
38.7"
Annual Snowfall
13.8"
Extreme Heat Days
37
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
4,073
Excellent for heat-loving 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 mild, with an average annual temperature of 55.1°F, moderate rainfall of 38.7 inches per year, occasional hot days — 37.166666666666664 per year above 90°F, light snow averaging 13.8 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 29.7°F. summers are warm — July averages 78.6°F. The 49°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
Johnson County closely matches the Kansas statewide average temperature of 54.8°F, it is also noticeably wetter, receiving 8.4 inches more precipitation than the state average, the county experiences 21.014523809523823 fewer extreme heat days than the state average.
Climate Profile
About Johnson County Weather
Warm Temperate Conditions with High Rainfall
Johnson County averages 55.1°F annually, sitting just above the national median temperature. Its 38.7 inches of annual precipitation is significantly higher than the average for the American West.
Kansas' Wettest Urban Hub
With 38.7 inches of rain, Johnson County is far wetter than the Kansas state average of 30.3 inches. Its annual temperature of 55.1°F is almost perfectly aligned with the state average of 54.8°F.
Consistent with the Kansas City Metro
Johnson shares a similar climate with neighboring Jefferson, but it is the wettest in this group at 38.7 inches. It also has the fewest extreme heat days in this set, averaging only 37 days above 90°F.
Damp Winters and Comfortable Summers
Summers are the most temperate in the region, with a July average of 78.6°F. Winters are chilly but not extreme, averaging 32.5°F with about 13.8 inches of annual snowfall.
Manage Moisture and Moderate Heat
High annual rainfall of 38.7 inches makes basement waterproofing and gutter maintenance essential for homeowners. While heat is moderate, the 37 days above 90°F still require functional cooling systems.
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.