Johnson County Climate
Johnson County, Missouri
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
54.3°F
Annual Precip
42.5"
Annual Snowfall
11.9"
Extreme Heat Days
36
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
3,913
Supports most vegetables & fruits
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 54.3°F, moderately wet with 42.5 inches of annual precipitation, occasional hot days — 36.3 per year above 90°F, light snow averaging 11.9 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 28.8°F. summers are warm — July averages 77.8°F. The 49°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 Missouri statewide average temperature of 54.9°F.
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 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.