Delta Iowa Climate Data

Monthly Average Climate Data for Delta Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.2 °F30.3 °F1.19 in.
February16.9 °F35.0 °F1.49 in.
March27.6 °F47.9 °F2.22 in.
April38.7 °F61.3 °F3.83 in.
May50.8 °F71.5 °F5.05 in.
June61.1 °F81.3 °F5.38 in.
July64.4 °F84.9 °F4.2 in.
August62.0 °F83.0 °F4.32 in.
September53.0 °F76.5 °F3.66 in.
October41.1 °F63.9 °F2.75 in.
November29.4 °F48.4 °F2.19 in.
December19.2 °F35.6 °F1.55 in.
Annual39.8 °F60 °F37.83 in.

Climate Data for Delta Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
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