Mount Prospect Illinois Climate Data

Monthly Average Climate Data for Mount Prospect Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.4 °F31.3 °F2.04 in.
February19.1 °F35.1 °F1.93 in.
March28.3 °F45.9 °F2.27 in.
April38.5 °F57.9 °F3.75 in.
May49.4 °F69.2 °F4.58 in.
June59.3 °F79.4 °F4.4 in.
July64.7 °F83.7 °F3.63 in.
August63.3 °F81.8 °F4.02 in.
September55.3 °F75.2 °F3.29 in.
October43.4 °F62.5 °F3.21 in.
November32.2 °F48.3 °F2.46 in.
December22.3 °F36.6 °F2.16 in.
Annual41 °F58.9 °F37.74 in.

Climate Data for Mount Prospect 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 ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation