Sioux City Iowa Climate Data

Monthly Average Climate Data for Sioux City Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January9.9 °F29.2 °F0.63 in.
February14.1 °F34.2 °F0.78 in.
March25.1 °F47.3 °F1.58 in.
April36.1 °F60.7 °F3.17 in.
May48.5 °F71.8 °F4.06 in.
June59.6 °F81.9 °F4.49 in.
July63.3 °F85.3 °F3.32 in.
August60.7 °F83.0 °F3.46 in.
September51.2 °F76.8 °F3.0 in.
October38.3 °F63.7 °F2.32 in.
November25.2 °F47.3 °F1.34 in.
December14.9 °F33.8 °F0.96 in.
Annual37.2 °F59.6 °F29.11 in.

Climate Data for Sioux City Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 11 - May 20
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsSevere Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation