Lewistown Illinois Climate Data

Monthly Average Climate Data for Lewistown Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.3 °F33.3 °F1.94 in.
February19.7 °F38.0 °F1.95 in.
March29.7 °F50.4 °F2.51 in.
April40.3 °F63.4 °F3.97 in.
May52.2 °F73.9 °F5.03 in.
June61.7 °F82.8 °F4.8 in.
July64.9 °F86.0 °F4.06 in.
August62.5 °F84.5 °F3.6 in.
September54.2 °F79.0 °F3.52 in.
October42.3 °F66.3 °F3.04 in.
November31.5 °F51.0 °F2.53 in.
December22.1 °F38.6 °F2.18 in.
Annual41.5 °F62.3 °F39.13 in.

Climate Data for Lewistown 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 ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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