Pegram, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.4 °C (low) to 20.8 °C (high). Annual precipitation averages 1342.7 Millimeters. Pegram is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.6 °C | 8.3 °C | 107.95 mm |
| February | -1.2 °C | 10.8 °C | 119.13 mm |
| March | 2.8 °C | 15.9 °C | 125.48 mm |
| April | 7.5 °C | 21.6 °C | 124.46 mm |
| May | 12.9 °C | 25.6 °C | 146.56 mm |
| June | 17.7 °C | 29.5 °C | 97.54 mm |
| July | 19.7 °C | 31.2 °C | 117.09 mm |
| August | 18.9 °C | 31.2 °C | 86.61 mm |
| September | 14.8 °C | 27.9 °C | 102.87 mm |
| October | 8.2 °C | 22.1 °C | 94.49 mm |
| November | 2.4 °C | 15.5 °C | 96.52 mm |
| December | -0.8 °C | 10.1 °C | 123.95 mm |
| Annual | 8.4 °C | 20.8 °C | 1342.65 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |