Brookfield Illinois Climate Data

Monthly Average Climate Data for Brookfield Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.7 °F31.8 °F2.18 in.
February20.4 °F35.6 °F2.09 in.
March29.8 °F46.6 °F2.37 in.
April40.1 °F59.2 °F3.97 in.
May51.0 °F70.4 °F4.78 in.
June61.2 °F80.5 °F4.38 in.
July66.2 °F85.0 °F4.15 in.
August64.9 °F82.9 °F4.16 in.
September57.0 °F76.4 °F3.27 in.
October44.6 °F63.3 °F3.46 in.
November33.4 °F49.2 °F2.54 in.
December23.5 °F37.3 °F2.32 in.
Annual42.5 °F59.9 °F39.67 in.

Climate Data for Brookfield Illinois

Average First Frost DateOct. 21 - Oct. 31
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 5b : -15°F to -10°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation