Irvington, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.5 °F (low) to 65.4 °F (high). Annual precipitation averages 44.7 Inches. Irvington 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.7 °F | 39.0 °F | 2.93 in. |
| February | 26.0 °F | 43.8 °F | 2.54 in. |
| March | 34.5 °F | 54.2 °F | 3.64 in. |
| April | 44.8 °F | 66.1 °F | 4.84 in. |
| May | 55.7 °F | 75.5 °F | 5.05 in. |
| June | 64.4 °F | 84.5 °F | 4.85 in. |
| July | 67.7 °F | 87.5 °F | 4.04 in. |
| August | 65.3 °F | 86.6 °F | 3.24 in. |
| September | 56.9 °F | 80.5 °F | 3.4 in. |
| October | 45.6 °F | 69.0 °F | 3.34 in. |
| November | 35.4 °F | 54.5 °F | 3.83 in. |
| December | 27.3 °F | 43.2 °F | 2.95 in. |
| Annual | 45.5 °F | 65.4 °F | 44.65 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |