Carrier Mills, Illinois has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.3 °F (low) to 66.9 °F (high). Annual precipitation averages 48.5 Inches. Carrier Mills is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.6 °F | 41.2 °F | 3.78 in. |
| February | 27.4 °F | 46.2 °F | 3.23 in. |
| March | 35.6 °F | 56.2 °F | 4.43 in. |
| April | 45.3 °F | 68.0 °F | 5.23 in. |
| May | 56.0 °F | 76.8 °F | 5.29 in. |
| June | 64.5 °F | 84.8 °F | 4.68 in. |
| July | 67.9 °F | 88.1 °F | 3.96 in. |
| August | 65.6 °F | 87.4 °F | 2.98 in. |
| September | 57.9 °F | 81.9 °F | 3.24 in. |
| October | 46.1 °F | 70.3 °F | 3.53 in. |
| November | 36.0 °F | 56.5 °F | 4.22 in. |
| December | 28.3 °F | 45.5 °F | 3.89 in. |
| Annual | 46.3 °F | 66.9 °F | 48.46 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 | Cfa - Humid Subtropical Climate |