Mason City Iowa Climate Data

Monthly Average Climate Data for Mason City Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January7.2 °F24.0 °F0.93 in.
February11.2 °F28.5 °F1.13 in.
March23.4 °F41.1 °F2.02 in.
April35.1 °F56.5 °F3.99 in.
May47.5 °F68.7 °F5.35 in.
June58.2 °F78.9 °F5.47 in.
July61.7 °F81.9 °F4.6 in.
August58.9 °F79.6 °F3.83 in.
September50.3 °F73.5 °F3.34 in.
October37.8 °F60.0 °F2.58 in.
November25.4 °F43.5 °F1.76 in.
December14.3 °F29.8 °F1.31 in.
Annual35.9 °F55.5 °F36.31 in.

Climate Data for Mason City Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 21 - May 31
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 ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation