Bartlett Illinois Climate Data

Monthly Average Climate Data for Bartlett Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.7 °F30.6 °F2.0 in.
February17.4 °F34.5 °F1.89 in.
March26.9 °F46.2 °F2.27 in.
April37.1 °F58.9 °F3.8 in.
May48.1 °F70.4 °F4.99 in.
June58.1 °F80.3 °F4.58 in.
July63.2 °F84.3 °F3.78 in.
August61.6 °F82.3 °F4.14 in.
September53.6 °F75.5 °F3.49 in.
October41.6 °F62.3 °F3.4 in.
November30.5 °F47.8 °F2.54 in.
December20.7 °F35.8 °F2.14 in.
Annual39.5 °F59.1 °F39.02 in.

Climate Data for Bartlett Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°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