Buchanan, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.1 °C (low) to 22.1 °C (high). Annual precipitation averages 1361.7 Millimeters. Buchanan is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.1 °C | 11.6 °C | 124.21 mm |
| February | 1.7 °C | 13.9 °C | 130.3 mm |
| March | 5.1 °C | 18.2 °C | 137.16 mm |
| April | 9.2 °C | 22.7 °C | 109.22 mm |
| May | 14.2 °C | 26.3 °C | 101.6 mm |
| June | 18.3 °C | 29.7 °C | 114.05 mm |
| July | 20.3 °C | 31.1 °C | 122.94 mm |
| August | 19.9 °C | 30.8 °C | 103.89 mm |
| September | 16.6 °C | 27.9 °C | 95.25 mm |
| October | 10.2 °C | 22.8 °C | 87.38 mm |
| November | 4.2 °C | 17.3 °C | 109.98 mm |
| December | 1.5 °C | 12.7 °C | 125.73 mm |
| Annual | 10.1 °C | 22.1 °C | 1361.71 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |