Irving, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.8 °C (low) to 17.9 °C (high). Annual precipitation averages 1057.4 Millimeters. Irving is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.4 °C | 2.2 °C | 68.83 mm |
| February | -4.4 °C | 5.2 °C | 56.13 mm |
| March | 0.6 °C | 11.4 °C | 77.22 mm |
| April | 6.3 °C | 18.7 °C | 121.41 mm |
| May | 12.4 °C | 24.2 °C | 128.02 mm |
| June | 17.3 °C | 28.9 °C | 112.27 mm |
| July | 19.1 °C | 30.6 °C | 97.28 mm |
| August | 17.8 °C | 30 °C | 83.06 mm |
| September | 13.4 °C | 26.9 °C | 76.71 mm |
| October | 7.1 °C | 20.2 °C | 84.58 mm |
| November | 1.4 °C | 11.7 °C | 87.12 mm |
| December | -3.5 °C | 5 °C | 64.77 mm |
| Annual | 6.8 °C | 17.9 °C | 1057.4 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |