Evanston, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.4 °F (low) to 58 °F (high). Annual precipitation averages 39.9 Inches. Evanston 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 | 19.8 °F | 32.2 °F | 2.35 in. |
| February | 22.8 °F | 36.1 °F | 2.28 in. |
| March | 31.2 °F | 45.6 °F | 2.21 in. |
| April | 40.9 °F | 56.8 °F | 3.88 in. |
| May | 51.1 °F | 67.0 °F | 4.54 in. |
| June | 61.4 °F | 76.5 °F | 4.45 in. |
| July | 68.2 °F | 81.1 °F | 3.83 in. |
| August | 67.8 °F | 79.6 °F | 4.18 in. |
| September | 60.4 °F | 73.4 °F | 3.53 in. |
| October | 47.9 °F | 62.0 °F | 3.58 in. |
| November | 36.1 °F | 48.6 °F | 2.69 in. |
| December | 25.7 °F | 37.4 °F | 2.42 in. |
| Annual | 44.4 °F | 58 °F | 39.94 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |