Calhoun, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.3 °F (low) to 71.8 °F (high). Annual precipitation averages 52.5 Inches. Calhoun is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 30.8 °F | 51.2 °F | 4.85 in. |
| February | 33.2 °F | 55.3 °F | 4.92 in. |
| March | 39.8 °F | 63.6 °F | 5.42 in. |
| April | 47.4 °F | 72.5 °F | 4.24 in. |
| May | 56.8 °F | 79.9 °F | 3.91 in. |
| June | 65.1 °F | 86.5 °F | 4.15 in. |
| July | 68.6 °F | 89.6 °F | 4.1 in. |
| August | 67.7 °F | 88.9 °F | 3.58 in. |
| September | 61.3 °F | 83.9 °F | 3.99 in. |
| October | 48.9 °F | 73.6 °F | 3.67 in. |
| November | 38.4 °F | 62.4 °F | 4.52 in. |
| December | 33.6 °F | 53.7 °F | 5.19 in. |
| Annual | 49.3 °F | 71.8 °F | 52.54 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |