Niantic Illinois Climate Data

Monthly Average Climate Data for Niantic Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.7 °F35.3 °F2.22 in.
February21.9 °F40.0 °F2.01 in.
March31.1 °F51.5 °F2.74 in.
April41.7 °F64.5 °F4.12 in.
May53.1 °F74.6 °F4.56 in.
June62.3 °F83.3 °F4.62 in.
July65.2 °F86.2 °F3.86 in.
August63.1 °F84.7 °F3.29 in.
September54.9 °F79.6 °F3.14 in.
October43.3 °F67.2 °F3.27 in.
November32.8 °F52.1 °F3.04 in.
December24.1 °F40.1 °F2.31 in.
Annual42.7 °F63.3 °F39.18 in.

Climate Data for Niantic Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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