Richmond Hill, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.2 °C (low) to 25.4 °C (high). Annual precipitation averages 1313.7 Millimeters. 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 | 3.5 °C | 16.4 °C | 92.71 mm |
| February | 5.1 °C | 18.2 °C | 84.58 mm |
| March | 8.4 °C | 21.7 °C | 92.71 mm |
| April | 12.2 °C | 25.6 °C | 81.79 mm |
| May | 16.8 °C | 29.2 °C | 87.12 mm |
| June | 20.8 °C | 31.9 °C | 156.97 mm |
| July | 22.4 °C | 33.4 °C | 151.89 mm |
| August | 22.2 °C | 32.6 °C | 192.28 mm |
| September | 19.9 °C | 30.2 °C | 119.63 mm |
| October | 14.1 °C | 26.2 °C | 103.12 mm |
| November | 8.1 °C | 21.3 °C | 63.75 mm |
| December | 5 °C | 17.7 °C | 87.12 mm |
| Annual | 13.2 °C | 25.4 °C | 1313.67 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |