Royston, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.7 °F (low) to 72.3 °F (high). Annual precipitation averages 50.9 Inches. Royston is located in USDA Plant Hardiness Zone 8b. 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 | 32.6 °F | 53.2 °F | 4.49 in. |
| February | 35.5 °F | 57.2 °F | 4.45 in. |
| March | 41.3 °F | 64.6 °F | 4.71 in. |
| April | 49.1 °F | 72.7 °F | 3.8 in. |
| May | 57.8 °F | 79.9 °F | 3.66 in. |
| June | 65.8 °F | 86.6 °F | 4.54 in. |
| July | 69.3 °F | 89.6 °F | 4.15 in. |
| August | 68.4 °F | 87.9 °F | 4.59 in. |
| September | 62.6 °F | 82.8 °F | 4.06 in. |
| October | 51.0 °F | 73.4 °F | 3.64 in. |
| November | 40.3 °F | 63.8 °F | 3.89 in. |
| December | 35.2 °F | 55.6 °F | 4.92 in. |
| Annual | 50.7 °F | 72.3 °F | 50.9 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 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |