Mount Prospect Illinois Climate Data

Monthly Average Climate Data for Mount Prospect Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.7 °C-0.4 °C51.82 mm
February-7.2 °C1.7 °C49.02 mm
March-2.1 °C7.7 °C57.66 mm
April3.6 °C14.4 °C95.25 mm
May9.7 °C20.7 °C116.33 mm
June15.2 °C26.3 °C111.76 mm
July18.2 °C28.7 °C92.2 mm
August17.4 °C27.7 °C102.11 mm
September12.9 °C24 °C83.57 mm
October6.3 °C16.9 °C81.53 mm
November0.1 °C9.1 °C62.48 mm
December-5.4 °C2.6 °C54.86 mm
Annual5 °C15 °C958.59 mm

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 : -23.3°C to -20.6°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation