Ontario Wisconsin Climate Data

Monthly Average Climate Data for Ontario Wisconsin

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January7.2 °F25.6 °F1.23 in.
February10.3 °F30.4 °F1.14 in.
March21.7 °F42.4 °F1.92 in.
April33.4 °F56.2 °F3.81 in.
May45.1 °F68.2 °F4.56 in.
June55.4 °F77.5 °F5.15 in.
July59.2 °F81.3 °F4.61 in.
August56.9 °F79.4 °F4.77 in.
September48.3 °F72.1 °F4.01 in.
October36.5 °F59.1 °F2.88 in.
November25.5 °F43.8 °F2.03 in.
December14.4 °F31.0 °F1.55 in.
Annual34.5 °F55.6 °F37.66 in.

Climate Data for Ontario Wisconsin

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 21 - May 31
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 4b : -25°F to -20°F
Plant Hardiness Zone - 2012Zone 4b : -25°F to -20°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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