Petersburg Illinois Climate Data

Monthly Average Climate Data for Petersburg Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.5 °F34.6 °F2.14 in.
February20.8 °F39.3 °F1.88 in.
March30.4 °F51.2 °F2.57 in.
April41.0 °F64.2 °F3.94 in.
May52.7 °F74.2 °F4.4 in.
June62.0 °F82.6 °F4.43 in.
July65.1 °F85.7 °F3.83 in.
August62.9 °F84.4 °F3.69 in.
September54.5 °F79.1 °F3.31 in.
October42.7 °F66.6 °F3.22 in.
November32.1 °F51.9 °F2.98 in.
December23.1 °F39.8 °F2.17 in.
Annual42.1 °F62.8 °F38.56 in.

Climate Data for 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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