Ellis Grove, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.7 °F (low) to 66.9 °F (high). Annual precipitation averages 43.2 Inches. Ellis Grove is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.2 °F | 41.3 °F | 2.65 in. |
| February | 26.7 °F | 46.5 °F | 2.53 in. |
| March | 34.8 °F | 56.5 °F | 3.57 in. |
| April | 44.9 °F | 67.9 °F | 4.82 in. |
| May | 55.3 °F | 76.8 °F | 5.22 in. |
| June | 64.1 °F | 85.5 °F | 4.27 in. |
| July | 68.0 °F | 88.7 °F | 3.97 in. |
| August | 65.7 °F | 87.8 °F | 3.12 in. |
| September | 57.4 °F | 81.3 °F | 3.15 in. |
| October | 45.8 °F | 70.1 °F | 3.19 in. |
| November | 35.6 °F | 56.1 °F | 3.68 in. |
| December | 27.2 °F | 44.8 °F | 3.03 in. |
| Annual | 45.7 °F | 66.9 °F | 43.2 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |