Wall Lake, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.9 °C (low) to 14.5 °C (high). Annual precipitation averages 835.2 Millimeters. Wall Lake is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.5 °C | -2.6 °C | 18.8 mm |
| February | -10.2 °C | 0.1 °C | 24.89 mm |
| March | -3.9 °C | 7.6 °C | 46.74 mm |
| April | 2.1 °C | 15.2 °C | 90.68 mm |
| May | 9.1 °C | 21.4 °C | 119.38 mm |
| June | 15.2 °C | 27 °C | 132.59 mm |
| July | 17.2 °C | 28.6 °C | 93.73 mm |
| August | 15.7 °C | 27.3 °C | 110.24 mm |
| September | 10.6 °C | 24.2 °C | 73.66 mm |
| October | 3.7 °C | 16.8 °C | 60.2 mm |
| November | -3.4 °C | 7.8 °C | 35.56 mm |
| December | -9.2 °C | 0.3 °C | 28.7 mm |
| Annual | 2.9 °C | 14.5 °C | 835.17 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |