Williamsville Illinois Climate Data

Monthly Average Climate Data for Williamsville Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.5 °F35.0 °F2.1 in.
February21.6 °F39.8 °F1.93 in.
March30.9 °F51.5 °F2.67 in.
April41.8 °F64.3 °F4.05 in.
May53.3 °F74.2 °F4.53 in.
June62.4 °F82.8 °F4.53 in.
July65.4 °F85.8 °F3.8 in.
August63.5 °F84.3 °F3.45 in.
September55.0 °F79.1 °F3.24 in.
October43.4 °F66.6 °F3.29 in.
November32.6 °F52.0 °F2.93 in.
December23.9 °F40.0 °F2.19 in.
Annual42.7 °F63 °F38.71 in.

Climate Data for Williamsville Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
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 ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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