Rosemont Illinois Climate Data

Monthly Average Climate Data for Rosemont Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.0 °F31.6 °F2.09 in.
February19.7 °F35.4 °F1.98 in.
March29.0 °F46.1 °F2.29 in.
April39.1 °F58.1 °F3.82 in.
May50.0 °F69.5 °F4.64 in.
June60.0 °F79.6 °F4.42 in.
July65.4 °F83.9 °F3.62 in.
August64.0 °F82.0 °F3.98 in.
September56.0 °F75.3 °F3.32 in.
October43.9 °F62.5 °F3.29 in.
November32.6 °F48.4 °F2.54 in.
December22.9 °F36.8 °F2.22 in.
Annual41.6 °F59.1 °F38.21 in.

Climate Data for Rosemont 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 ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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