Jacksonville Illinois Climate Data

Monthly Average Climate Data for Jacksonville Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-7.6 °C1.8 °C54.36 mm
February-5.7 °C4.7 °C48.26 mm
March-0.7 °C11.1 °C73.66 mm
April5.2 °C18.2 °C106.43 mm
May11.6 °C23.7 °C123.7 mm
June16.7 °C28.5 °C125.48 mm
July18.6 °C30.2 °C103.38 mm
August17.2 °C29.4 °C85.34 mm
September12.6 °C26.6 °C88.39 mm
October6.2 °C19.6 °C77.47 mm
November0.3 °C11.4 °C75.69 mm
December-4.7 °C4.7 °C55.63 mm
Annual5.8 °C17.5 °C1017.79 mm

Climate Data for Jacksonville 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 6a : -23.3°C to -20.6°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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