Belvidere Illinois Climate Data

Monthly Average Climate Data for Belvidere Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.6 °F28.6 °F1.66 in.
February15.9 °F32.8 °F1.62 in.
March26.2 °F45.1 °F2.17 in.
April37.0 °F58.5 °F3.68 in.
May48.5 °F70.3 °F4.46 in.
June58.4 °F79.8 °F5.51 in.
July62.2 °F83.2 °F4.01 in.
August60.5 °F81.6 °F4.19 in.
September52.2 °F75.2 °F3.55 in.
October40.3 °F62.1 °F2.88 in.
November29.4 °F46.9 °F2.34 in.
December18.9 °F34.1 °F2.03 in.
Annual38.5 °F58.2 °F38.1 in.

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