Pelham, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.7 °C (low) to 20.6 °C (high). Annual precipitation averages 1484.4 Millimeters. Pelham is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.8 °C | 8.8 °C | 126.49 mm |
| February | -0.4 °C | 11.1 °C | 130.3 mm |
| March | 3.3 °C | 15.9 °C | 142.24 mm |
| April | 7.9 °C | 21.1 °C | 139.19 mm |
| May | 13.2 °C | 25.2 °C | 117.86 mm |
| June | 17.5 °C | 28.8 °C | 134.37 mm |
| July | 19.5 °C | 30.6 °C | 125.98 mm |
| August | 18.7 °C | 30.3 °C | 107.44 mm |
| September | 15.1 °C | 27.6 °C | 106.17 mm |
| October | 8.4 °C | 21.9 °C | 83.82 mm |
| November | 2.7 °C | 15.6 °C | 109.73 mm |
| December | -0.1 °C | 10.7 °C | 160.78 mm |
| Annual | 8.7 °C | 20.6 °C | 1484.37 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |