Chester Illinois Climate Data

Monthly Average Climate Data for Chester Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January23.4 °F41.2 °F2.79 in.
February26.7 °F46.4 °F2.63 in.
March34.9 °F56.3 °F3.58 in.
April45.0 °F67.6 °F4.95 in.
May55.3 °F76.3 °F5.37 in.
June64.0 °F84.7 °F4.28 in.
July67.9 °F88.0 °F3.96 in.
August65.6 °F87.3 °F3.02 in.
September57.3 °F80.7 °F3.16 in.
October45.9 °F69.8 °F3.21 in.
November35.6 °F56.0 °F3.9 in.
December27.2 °F44.9 °F3.07 in.
Annual45.7 °F66.6 °F43.92 in.

Climate Data for Chester Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 7a : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
2024 plantmaps.com