Grayson, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.1 °F (low) to 71.3 °F (high). Annual precipitation averages 52.9 Inches. Grayson is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.7 °F | 51.6 °F | 4.88 in. |
| February | 34.5 °F | 55.5 °F | 4.77 in. |
| March | 40.5 °F | 63.7 °F | 5.0 in. |
| April | 48.2 °F | 71.9 °F | 4.16 in. |
| May | 57.3 °F | 79.1 °F | 3.85 in. |
| June | 65.3 °F | 85.4 °F | 4.71 in. |
| July | 68.8 °F | 88.3 °F | 4.84 in. |
| August | 68.0 °F | 87.5 °F | 4.4 in. |
| September | 61.9 °F | 82.1 °F | 3.86 in. |
| October | 50.7 °F | 73.0 °F | 3.55 in. |
| November | 39.8 °F | 62.6 °F | 4.18 in. |
| December | 34.7 °F | 54.3 °F | 4.73 in. |
| Annual | 50.1 °F | 71.3 °F | 52.93 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 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 |