Graysville, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.8 °F (low) to 73.8 °F (high). Annual precipitation averages 58.6 Inches. Graysville 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 | 33.3 °F | 54.0 °F | 5.45 in. |
| February | 36.0 °F | 58.4 °F | 5.44 in. |
| March | 43.0 °F | 66.6 °F | 5.82 in. |
| April | 50.2 °F | 74.6 °F | 5.21 in. |
| May | 59.3 °F | 81.4 °F | 4.56 in. |
| June | 67.0 °F | 87.5 °F | 4.86 in. |
| July | 70.3 °F | 90.5 °F | 5.05 in. |
| August | 69.6 °F | 90.1 °F | 4.15 in. |
| September | 64.0 °F | 85.6 °F | 4.52 in. |
| October | 51.9 °F | 75.5 °F | 3.45 in. |
| November | 41.4 °F | 64.7 °F | 4.71 in. |
| December | 36.0 °F | 56.3 °F | 5.37 in. |
| Annual | 51.8 °F | 73.8 °F | 58.59 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |