Selmer, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.5 °C (low) to 21.9 °C (high). Annual precipitation averages 1478.3 Millimeters. Selmer is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.4 °C | 9.6 °C | 115.57 mm |
| February | 0.3 °C | 12.2 °C | 132.84 mm |
| March | 4.2 °C | 17.1 °C | 144.27 mm |
| April | 8.9 °C | 22.5 °C | 143 mm |
| May | 14.3 °C | 26.7 °C | 137.92 mm |
| June | 18.8 °C | 30.6 °C | 115.57 mm |
| July | 20.7 °C | 32.3 °C | 125.48 mm |
| August | 19.8 °C | 32.1 °C | 98.04 mm |
| September | 15.9 °C | 29.1 °C | 107.44 mm |
| October | 9.2 °C | 23.1 °C | 104.39 mm |
| November | 3.5 °C | 16.6 °C | 111.76 mm |
| December | 0.3 °C | 11.1 °C | 141.99 mm |
| Annual | 9.5 °C | 21.9 °C | 1478.27 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |