Petersburg Illinois Climate Data

Monthly Average Climate Data for Petersburg Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.1 °C1.4 °C54.36 mm
February-6.2 °C4.1 °C47.75 mm
March-0.9 °C10.7 °C65.28 mm
April5 °C17.9 °C100.08 mm
May11.5 °C23.4 °C111.76 mm
June16.7 °C28.1 °C112.52 mm
July18.4 °C29.8 °C97.28 mm
August17.2 °C29.1 °C93.73 mm
September12.5 °C26.2 °C84.07 mm
October5.9 °C19.2 °C81.79 mm
November0.1 °C11.1 °C75.69 mm
December-4.9 °C4.3 °C55.12 mm
Annual5.6 °C17.1 °C979.43 mm

Climate Data for Petersburg 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 : -23.3°C to -20.6°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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