Sully Iowa Climate Data

Monthly Average Climate Data for Sully Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.3 °F29.3 °F1.04 in.
February16.1 °F34.1 °F1.35 in.
March27.0 °F47.2 °F2.1 in.
April38.2 °F60.7 °F3.95 in.
May50.7 °F71.3 °F4.97 in.
June61.0 °F80.9 °F5.36 in.
July64.5 °F84.5 °F4.29 in.
August61.9 °F82.5 °F4.39 in.
September53.0 °F76.3 °F3.6 in.
October40.9 °F63.4 °F2.74 in.
November28.9 °F47.7 °F2.01 in.
December18.4 °F34.8 °F1.48 in.
Annual39.4 °F59.4 °F37.28 in.

Climate Data for Sully Iowa

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 5a : -20°F to -15°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation