Lake Petersburg Illinois Climate Data

Monthly Average Climate Data for Lake Petersburg Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.9 °F34.8 °F2.14 in.
February21.3 °F39.6 °F1.89 in.
March30.5 °F51.4 °F2.58 in.
April41.2 °F64.1 °F3.95 in.
May52.8 °F74.0 °F4.41 in.
June62.1 °F82.3 °F4.44 in.
July65.1 °F85.4 °F3.81 in.
August63.0 °F84.1 °F3.68 in.
September54.6 °F78.9 °F3.3 in.
October43.0 °F66.3 °F3.22 in.
November32.3 °F52.0 °F2.99 in.
December23.4 °F39.9 °F2.17 in.
Annual42.3 °F62.7 °F38.58 in.

Climate Data for Lake Petersburg 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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