Johnston County Climate
Johnston County, Oklahoma
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
62.2°F
Annual Precip
42.4"
Annual Snowfall
2.2"
Extreme Heat Days
77
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8a
Minimum winter temperature range for plant survival
5,393
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Johnston County
Climate Verdict
Johnston County has a warm, averaging 62.2°F year-round, moderately wet with 42.4 inches of annual precipitation, significant summer heat with 77.3 days annually above 90°F, light snow averaging 2.2 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 41.1°F. summers are hot, with July averaging 82.2°F. The 41°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
Johnston County closely matches the Oklahoma statewide average temperature of 60.4°F, it is also noticeably wetter, receiving 5.2 inches more precipitation than the state average.
Climate Profile
About Johnston County Weather
Warm and Wet Subtropical Profile
Johnston County averages 62.2°F annually, staying well above the national median temperature. The region experiences a humid subtropical climate with generous rainfall throughout the year.
Surpassing State Average Rainfall
With 42.4 inches of annual precipitation, Johnston County is wetter than the Oklahoma state average of 37.2 inches. Its 62.2°F average temperature also runs about two degrees warmer than the state mean.
Lush Landscapes Compared to the West
Johnston receives 10 inches more rain annually than Jefferson County, supporting a much greener landscape. However, it stays slightly cooler than Jefferson, averaging 77 extreme heat days compared to Jefferson's 100.
Mild Winters and Humid Summers
July averages a warm 82.2°F, contributing to 77 days of extreme heat each year. Winters remain gentle with a 43.4°F average and only 2.2 inches of annual snowfall.
Manage Rain and High Humidity
Homeowners should maintain clear gutters and drainage systems to handle the 42.4 inches of annual rain. Dehumidifiers are often necessary in summer to manage the moisture that accompanies the heat.
Frequently Asked Questions
What is the average temperature in Johnston County?
How much rain does Johnston County get?
Does it snow in Johnston County?
How hot does Johnston County get in summer?
How cold are winters in Johnston County?
Track your own weather in Johnston County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
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.