Johnson County Climate
Johnson County, Kansas
Avg Annual Temp
55.1°F
Annual Precip
38.7"
Annual Snowfall
13.8"
Extreme Heat Days
37.166666666666664
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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.
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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.