Carterville, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.7 °F (low) to 68.3 °F (high). Annual precipitation averages 46.9 Inches. Carterville 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.2 °F | 44.1 °F | 2.07 in. |
| February | 27.5 °F | 49.0 °F | 2.18 in. |
| March | 36.2 °F | 58.7 °F | 3.45 in. |
| April | 45.6 °F | 68.3 °F | 5.15 in. |
| May | 55.9 °F | 76.3 °F | 6.74 in. |
| June | 65.0 °F | 85.1 °F | 5.3 in. |
| July | 69.2 °F | 89.9 °F | 4.02 in. |
| August | 67.2 °F | 89.7 °F | 3.47 in. |
| September | 58.8 °F | 82.1 °F | 4.45 in. |
| October | 47.0 °F | 70.9 °F | 3.87 in. |
| November | 36.3 °F | 58.0 °F | 3.46 in. |
| December | 27.7 °F | 47.4 °F | 2.71 in. |
| Annual | 46.7 °F | 68.3 °F | 46.87 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |