Loudon, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.6 °F (low) to 70.2 °F (high). Annual precipitation averages 56 Inches. Loudon is located in USDA Plant Hardiness Zone 7b. 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 | 28.3 °F | 48.2 °F | 5.13 in. |
| February | 31.1 °F | 52.7 °F | 4.98 in. |
| March | 37.5 °F | 61.5 °F | 5.34 in. |
| April | 45.6 °F | 71.1 °F | 4.87 in. |
| May | 55.4 °F | 78.9 °F | 4.1 in. |
| June | 63.8 °F | 85.5 °F | 4.31 in. |
| July | 67.7 °F | 88.4 °F | 5.31 in. |
| August | 66.6 °F | 87.9 °F | 3.55 in. |
| September | 60.0 °F | 83.4 °F | 4.71 in. |
| October | 47.6 °F | 72.5 °F | 3.63 in. |
| November | 36.6 °F | 60.5 °F | 4.4 in. |
| December | 31.5 °F | 51.2 °F | 5.7 in. |
| Annual | 47.6 °F | 70.2 °F | 56.03 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 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |