Westville Illinois Climate Data

Monthly Average Climate Data for Westville Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.2 °F34.1 °F2.47 in.
February21.3 °F38.7 °F2.16 in.
March30.7 °F50.3 °F2.95 in.
April41.2 °F63.5 °F4.2 in.
May52.6 °F74.1 °F4.61 in.
June61.8 °F82.4 °F4.91 in.
July64.3 °F84.9 °F4.22 in.
August62.1 °F83.6 °F3.25 in.
September54.5 °F78.8 °F3.01 in.
October43.1 °F66.4 °F3.44 in.
November32.7 °F51.3 °F3.37 in.
December23.9 °F39.0 °F2.55 in.
Annual42.2 °F62.3 °F41.14 in.

Climate Data for Westville Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
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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