Jefferson County Climate
Jefferson County, Nebraska
Avg Annual Temp
51.6°F
Annual Precip
32.4"
Annual Snowfall
20.7"
Extreme Heat Days
41.7
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Jefferson County Weather
A Moist and Temperate Climate
Jefferson County averages 51.6°F annually, roughly 2.4 degrees below the national median. It is one of the more humid and precipitation-rich areas in the Great Plains region.
Nebraska’s Southeastern Wet Zone
With 32.4 inches of annual precipitation, Jefferson is significantly wetter than the Nebraska average of 25.9 inches. It also runs warmer than the state average of 49.7°F.
Higher Rainfall, Lower Snowfall
The county receives only 20.7 inches of snow, the lowest among its regional peers. Instead, it gets more of its annual moisture through rain, totaling over 32 inches.
Steamy Summers and Mild Winters
Summer brings 42 days of extreme heat and a July average of 76.6°F. Winters are relatively mild for Nebraska, with a Dec-Feb average temperature of 27.8°F.
Manage Moisture and Summer Heat
Dehumidifiers and good drainage systems are essential to handle the high 32.4-inch annual precipitation. HVAC systems should be serviced annually to cope with six weeks of 90-degree summer days.
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.