Calhoun, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.6 °F (low) to 70.4 °F (high). Annual precipitation averages 58.1 Inches. Calhoun is located in USDA Plant Hardiness Zone 7b. 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 | 28.7 °F | 48.7 °F | 5.43 in. |
| February | 31.3 °F | 53.2 °F | 4.85 in. |
| March | 37.6 °F | 61.9 °F | 5.69 in. |
| April | 45.7 °F | 71.4 °F | 4.99 in. |
| May | 55.5 °F | 78.9 °F | 4.41 in. |
| June | 63.7 °F | 85.7 °F | 4.85 in. |
| July | 67.7 °F | 88.6 °F | 5.57 in. |
| August | 66.5 °F | 88.2 °F | 3.87 in. |
| September | 59.8 °F | 83.2 °F | 4.72 in. |
| October | 47.2 °F | 72.7 °F | 3.24 in. |
| November | 35.9 °F | 60.9 °F | 4.7 in. |
| December | 31.4 °F | 51.6 °F | 5.75 in. |
| Annual | 47.6 °F | 70.4 °F | 58.07 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 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |