Mendon Illinois Climate Data

Monthly Average Climate Data for Mendon Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.8 °F34.4 °F1.79 in.
February21.3 °F39.3 °F1.97 in.
March31.1 °F51.2 °F2.55 in.
April42.0 °F63.4 °F4.04 in.
May53.3 °F73.4 °F5.13 in.
June62.7 °F82.5 °F4.79 in.
July66.2 °F86.3 °F4.02 in.
August63.8 °F84.7 °F3.86 in.
September55.3 °F78.4 °F3.55 in.
October43.9 °F65.9 °F3.24 in.
November32.9 °F51.6 °F2.66 in.
December23.2 °F39.0 °F2.0 in.
Annual42.8 °F62.5 °F39.6 in.

Climate Data for Mendon Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 11 - Apr. 20
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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