Johnston County Climate
Johnston County, Oklahoma
Avg Annual Temp
62.2°F
Annual Precip
42.4"
Annual Snowfall
2.2"
Extreme Heat Days
77.3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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
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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.