Irvington, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.6 °C (low) to 13.6 °C (high). Annual precipitation averages 864.9 Millimeters. Irvington 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 | -13.3 °C | -3.9 °C | 20.57 mm |
| February | -10.9 °C | -1.4 °C | 25.15 mm |
| March | -4.3 °C | 5.8 °C | 49.78 mm |
| April | 2.1 °C | 14.3 °C | 92.46 mm |
| May | 9.1 °C | 20.9 °C | 120.14 mm |
| June | 15.2 °C | 26.4 °C | 134.62 mm |
| July | 16.9 °C | 28.1 °C | 106.17 mm |
| August | 15.4 °C | 26.8 °C | 105.16 mm |
| September | 10.4 °C | 23.6 °C | 81.28 mm |
| October | 3.4 °C | 16.2 °C | 59.44 mm |
| November | -3.5 °C | 6.9 °C | 39.62 mm |
| December | -9.8 °C | -0.9 °C | 30.48 mm |
| Annual | 2.6 °C | 13.6 °C | 864.87 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 |