Jacksonville Illinois Climate Data

Monthly Average Climate Data for Jacksonville Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.3 °F35.3 °F2.14 in.
February21.7 °F40.4 °F1.9 in.
March30.8 °F51.9 °F2.9 in.
April41.3 °F64.7 °F4.19 in.
May52.8 °F74.6 °F4.87 in.
June62.1 °F83.3 °F4.94 in.
July65.5 °F86.4 °F4.07 in.
August63.0 °F85.0 °F3.36 in.
September54.6 °F79.8 °F3.48 in.
October43.1 °F67.2 °F3.05 in.
November32.6 °F52.5 °F2.98 in.
December23.6 °F40.4 °F2.19 in.
Annual42.5 °F63.5 °F40.07 in.

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 : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
2024 plantmaps.com