Jefferson Wisconsin Climate Data

Monthly Average Climate Data for Jefferson Wisconsin

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January11.4 °F27.5 °F1.55 in.
February14.2 °F31.3 °F1.52 in.
March24.9 °F43.5 °F2.07 in.
April36.1 °F56.8 °F3.83 in.
May47.7 °F69.3 °F4.13 in.
June57.7 °F79.2 °F5.28 in.
July61.8 °F82.8 °F4.17 in.
August59.9 °F80.9 °F4.14 in.
September51.6 °F74.1 °F3.44 in.
October40.1 °F60.9 °F2.96 in.
November28.8 °F45.8 °F2.22 in.
December18.4 °F32.9 °F1.82 in.
Annual37.7 °F57.1 °F37.13 in.

Climate Data for Jefferson Wisconsin

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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