Wallingford, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.2 °C (low) to 13.2 °C (high). Annual precipitation averages 797.3 Millimeters. Wallingford 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 | -13.8 °C | -4.4 °C | 20.32 mm |
| February | -11.6 °C | -2 °C | 21.34 mm |
| March | -4.9 °C | 5 °C | 42.67 mm |
| April | 1.8 °C | 13.8 °C | 85.34 mm |
| May | 8.8 °C | 20.6 °C | 115.32 mm |
| June | 14.9 °C | 26.2 °C | 124.21 mm |
| July | 16.8 °C | 28.1 °C | 94.74 mm |
| August | 15.2 °C | 26.6 °C | 93.47 mm |
| September | 10.5 °C | 23.5 °C | 80.77 mm |
| October | 3.3 °C | 15.7 °C | 60.45 mm |
| November | -3.9 °C | 6.4 °C | 33.53 mm |
| December | -10.3 °C | -1.5 °C | 25.15 mm |
| Annual | 2.2 °C | 13.2 °C | 797.31 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |