Johnston County Climate
Johnston County, North Carolina
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
60.8°F
Annual Precip
50.8"
Annual Snowfall
2.0"
Extreme Heat Days
47
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8a
Minimum winter temperature range for plant survival
4,910
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 60.8°F year-round, moderately wet with 50.8 inches of annual precipitation, occasional hot days — 46.85 per year above 90°F, light snow averaging 2.0 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 41.6°F. summers are hot, with July averaging 80.1°F. The 38°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 North Carolina statewide average temperature of 59.3°F.
Climate Profile
About Johnston County Weather
A warm inland subtropical environment
Johnston County's 60.8°F annual average is well above the national median. This climate supports long growing seasons and very warm, humid summers.
Topping the state average for heat
The county is warmer than the 59.3°F state average by over a degree. It closely mirrors the state average for precipitation, receiving 50.8 inches annually.
Typical central North Carolina weather
Johnston's 2.0 inches of annual snowfall is slightly lower than some neighbors to the west. It maintains a consistent rainfall profile that supports the region's diverse agriculture.
Intense summer heat dominates the year
Residents face 47 extreme heat days annually, with July temperatures averaging a hot 80.1°F. Winters are mild, with the temperature rarely staying below freezing for long.
Stay hydrated and manage cooling costs
Budget for significant air conditioning use during the 47 days of 90-degree weather. Since snow is rare at only 2 inches, focus your emergency prep on summer storms and heat safety.
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.