Richmond Hill, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.8 °F (low) to 77.7 °F (high). Annual precipitation averages 51.7 Inches. Richmond Hill is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.3 °F | 61.6 °F | 3.65 in. |
| February | 41.1 °F | 64.8 °F | 3.33 in. |
| March | 47.2 °F | 71.1 °F | 3.65 in. |
| April | 53.9 °F | 78.0 °F | 3.22 in. |
| May | 62.2 °F | 84.6 °F | 3.43 in. |
| June | 69.5 °F | 89.5 °F | 6.18 in. |
| July | 72.4 °F | 92.2 °F | 5.98 in. |
| August | 72.0 °F | 90.7 °F | 7.57 in. |
| September | 67.9 °F | 86.4 °F | 4.71 in. |
| October | 57.3 °F | 79.1 °F | 4.06 in. |
| November | 46.5 °F | 70.3 °F | 2.51 in. |
| December | 41.0 °F | 63.9 °F | 3.43 in. |
| Annual | 55.8 °F | 77.7 °F | 51.72 in. |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |