Harper County Climate
Harper County, Oklahoma
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
57.9°F
Annual Precip
22.5"
Annual Snowfall
15.5"
Extreme Heat Days
98
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
4,661
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Harper County
Climate Verdict
Harper County has a mild, with an average annual temperature of 57.9°F, semi-arid conditions with only 22.5 inches of annual precipitation, significant summer heat with 98 days annually above 90°F, light snow averaging 15.5 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 34.7°F. summers are hot, with July averaging 82.4°F. The 48°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Summer outdoor activities should be planned for early morning or evening to avoid extreme heat.
Regional Context
Harper County closely matches the Oklahoma statewide average temperature of 60.4°F, it is also noticeably drier, receiving 14.7 inches less precipitation than the state average, the county experiences 21.58905092592589 more extreme heat days than the state average.
Climate Profile
About Harper County Weather
Cool and dry northern plains
Harper County is one of the state's coolest regions with a 57.9°F annual average. Its 22.5 inches of precipitation is significantly lower than the Oklahoma state average of 37.2 inches.
Cooler and drier than the state
Harper ranks as a cooler Oklahoma county, sitting 2.5 degrees below the state average of 60.4°F. It also receives nearly 15 inches less rain than the state norm.
A hub for winter snow
This county is much snowier than its southern neighbors, recording a significant 15.5 inches annually. Its 22.5 inches of rain makes it one of the driest counties in the state.
Vast temperature and weather swings
Harper experiences extreme swings, from 98 days of 90°F heat in summer to 15.5 inches of snow in winter. The January average drops to 34.7°F, reflecting its exposed northern location.
Plan for snow and sun
Residents need both heavy-duty snow removal equipment and efficient cooling for the 98 extreme heat days. Moisture-retaining soil additives can help gardens survive the dry 22.5-inch annual rainfall.
Frequently Asked Questions
What is the average temperature in Harper County?
How much rain does Harper County get?
Does it snow in Harper County?
How hot does Harper County get in summer?
How cold are winters in Harper County?
Track your own weather in Harper 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.