Harvey Illinois Climate Data

Monthly Average Climate Data for Harvey Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.5 °F32.1 °F2.21 in.
February20.2 °F35.8 °F2.08 in.
March29.4 °F46.7 °F2.38 in.
April39.7 °F59.3 °F3.89 in.
May50.6 °F70.1 °F4.48 in.
June60.6 °F80.0 °F4.56 in.
July65.3 °F84.1 °F4.4 in.
August63.8 °F82.2 °F4.15 in.
September56.2 °F76.2 °F3.23 in.
October44.0 °F63.3 °F3.46 in.
November33.1 °F49.3 °F2.69 in.
December23.1 °F37.2 °F2.28 in.
Annual42 °F59.7 °F39.81 in.

Climate Data for Harvey Illinois

Average First Frost DateNov. 21 - Nov. 30
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness ZoneZone 5b : -15°F to -10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
2023 plantmaps.com