Niles, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.8 °F (low) to 58.8 °F (high). Annual precipitation averages 38.8 Inches. Niles 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 | 18.1 °F | 31.7 °F | 2.17 in. |
| February | 20.9 °F | 35.5 °F | 2.1 in. |
| March | 29.8 °F | 45.5 °F | 2.27 in. |
| April | 39.9 °F | 57.4 °F | 3.87 in. |
| May | 50.8 °F | 68.8 °F | 4.65 in. |
| June | 61.0 °F | 79.0 °F | 4.41 in. |
| July | 66.7 °F | 83.4 °F | 3.68 in. |
| August | 65.5 °F | 81.5 °F | 4.02 in. |
| September | 57.7 °F | 74.9 °F | 3.39 in. |
| October | 45.5 °F | 62.5 °F | 3.39 in. |
| November | 33.9 °F | 48.3 °F | 2.57 in. |
| December | 24.0 °F | 37.0 °F | 2.27 in. |
| Annual | 42.8 °F | 58.8 °F | 38.79 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 6a : -10°F to -5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |