Norridge, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.3 °F (low) to 59.1 °F (high). Annual precipitation averages 38.5 Inches. Norridge is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.5 °F | 31.6 °F | 2.14 in. |
| February | 20.3 °F | 35.4 °F | 2.06 in. |
| March | 29.5 °F | 46.2 °F | 2.29 in. |
| April | 39.7 °F | 58.0 °F | 3.91 in. |
| May | 50.5 °F | 69.3 °F | 4.61 in. |
| June | 60.7 °F | 79.4 °F | 4.37 in. |
| July | 66.1 °F | 83.8 °F | 3.66 in. |
| August | 64.8 °F | 82.0 °F | 3.96 in. |
| September | 56.8 °F | 75.3 °F | 3.31 in. |
| October | 44.7 °F | 62.6 °F | 3.37 in. |
| November | 33.2 °F | 48.5 °F | 2.56 in. |
| December | 23.3 °F | 36.9 °F | 2.26 in. |
| Annual | 42.3 °F | 59.1 °F | 38.5 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |