Pelham, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.9 °C (low) to 25.6 °C (high). Annual precipitation averages 1325.1 Millimeters. Pelham is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.4 °C | 16.9 °C | 123.19 mm |
| February | 6.1 °C | 19 °C | 116.84 mm |
| March | 9.2 °C | 22.5 °C | 131.57 mm |
| April | 13.1 °C | 25.8 °C | 100.33 mm |
| May | 17.7 °C | 29.7 °C | 65.28 mm |
| June | 21.3 °C | 31.8 °C | 141.99 mm |
| July | 22.5 °C | 32.9 °C | 140.46 mm |
| August | 22.8 °C | 32.4 °C | 134.37 mm |
| September | 20.4 °C | 30.4 °C | 106.68 mm |
| October | 14.6 °C | 26.6 °C | 72.9 mm |
| November | 8.5 °C | 21.6 °C | 82.3 mm |
| December | 5.9 °C | 18 °C | 109.22 mm |
| Annual | 13.9 °C | 25.6 °C | 1325.13 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |