Grand Junction Iowa Climate Data

Monthly Average Climate Data for Grand Junction Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January10.3 °F28.3 °F0.91 in.
February14.6 °F33.1 °F1.16 in.
March26.0 °F46.4 °F2.01 in.
April37.1 °F60.9 °F3.75 in.
May49.4 °F71.5 °F4.98 in.
June59.8 °F80.8 °F5.27 in.
July63.4 °F84.4 °F4.25 in.
August60.8 °F82.2 °F4.11 in.
September51.8 °F76.4 °F3.21 in.
October39.4 °F63.5 °F2.61 in.
November27.2 °F47.0 °F1.77 in.
December16.5 °F33.7 °F1.34 in.
Annual38 °F59 °F35.37 in.

Climate Data for Grand Junction Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 1 - May 10
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
2024 plantmaps.com