Hartland Wisconsin Climate Data

Monthly Average Climate Data for Hartland Wisconsin

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January11.4 °F27.2 °F1.75 in.
February14.2 °F30.9 °F1.62 in.
March23.8 °F42.3 °F2.08 in.
April34.8 °F55.2 °F3.81 in.
May45.8 °F66.9 °F4.11 in.
June55.7 °F76.6 °F4.73 in.
July60.6 °F81.2 °F4.13 in.
August59.0 °F79.4 °F3.84 in.
September50.9 °F72.5 °F3.22 in.
October39.6 °F59.5 °F2.91 in.
November28.5 °F45.1 °F2.14 in.
December18.0 °F32.7 °F1.98 in.
Annual36.9 °F55.8 °F36.32 in.

Climate Data for Hartland Wisconsin

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 21 - May 31
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 ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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