Johnson County Climate
Johnson County, Missouri
Avg Annual Temp
54.3°F
Annual Precip
42.5"
Annual Snowfall
11.9"
Extreme Heat Days
36.3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Johnson County Weather
Standard Midwestern Climate in Johnson
Johnson County’s 54.3°F annual average temperature sits right in line with the national median. The county experiences a typical range of weather, from snowy winters to hot, sunny summers.
Matching Missouri's State Climate Profile
Johnson County stays slightly cooler than the 54.9°F Missouri state average. Its annual precipitation of 42.5 inches is also just below the state average of 43.8 inches.
Higher Snowfall Than Nearby Jackson
While sharing a similar temperature profile with Jackson County, Johnson receives more snow at 11.9 inches annually. It also sees 36 extreme heat days, slightly more than its neighbor to the west.
Cold Winters and Steamy July Days
The county records 36 days of temperatures exceeding 90°F during the hot 75.8°F summer months. Winters are chilly, averaging 31.8°F with nearly a foot of annual snowfall.
Prepare for Snow and Summer Sun
With 11.9 inches of snow, a reliable snowblower or shovel is a winter necessity. During the 36 days of extreme heat, residents should ensure their homes are well-insulated to keep cooling costs down.
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.