Dover Illinois Climate Data

Monthly Average Climate Data for Dover Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.3 °F30.4 °F1.8 in.
February18.0 °F35.0 °F1.8 in.
March27.8 °F47.4 °F2.36 in.
April38.4 °F60.9 °F3.69 in.
May50.2 °F72.2 °F4.82 in.
June60.0 °F81.0 °F4.79 in.
July63.5 °F84.0 °F3.89 in.
August61.3 °F82.1 °F3.85 in.
September53.1 °F76.4 °F3.55 in.
October41.6 °F63.8 °F3.02 in.
November30.3 °F48.5 °F2.5 in.
December20.3 °F35.7 °F2.01 in.
Annual39.9 °F59.8 °F38.08 in.

Climate Data for Dover Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
2024 plantmaps.com