Graysville, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.8 °F (low) to 70.2 °F (high). Annual precipitation averages 60.5 Inches. Graysville 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 | 48.6 °F | 5.42 in. |
| February | 31.5 °F | 53.2 °F | 5.17 in. |
| March | 37.8 °F | 61.8 °F | 5.59 in. |
| April | 45.9 °F | 71.3 °F | 5.42 in. |
| May | 55.6 °F | 78.7 °F | 4.87 in. |
| June | 63.8 °F | 85.4 °F | 4.67 in. |
| July | 67.8 °F | 88.3 °F | 5.82 in. |
| August | 66.5 °F | 88.1 °F | 4.11 in. |
| September | 60.0 °F | 82.7 °F | 4.8 in. |
| October | 47.5 °F | 72.1 °F | 3.58 in. |
| November | 36.4 °F | 60.7 °F | 4.84 in. |
| December | 31.6 °F | 51.3 °F | 6.2 in. |
| Annual | 47.8 °F | 70.2 °F | 60.49 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 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |