Coalfield, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 20.7 °C (high). Annual precipitation averages 1521.2 Millimeters. Coalfield 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 | -2.1 °C | 8.3 °C | 135.64 mm |
| February | -0.3 °C | 10.9 °C | 141.22 mm |
| March | 3.2 °C | 15.9 °C | 138.94 mm |
| April | 7.9 °C | 21.4 °C | 139.95 mm |
| May | 13.2 °C | 25.7 °C | 113.54 mm |
| June | 17.4 °C | 29.3 °C | 126.49 mm |
| July | 19.7 °C | 30.8 °C | 154.43 mm |
| August | 18.9 °C | 30.4 °C | 99.06 mm |
| September | 15.6 °C | 27.9 °C | 109.47 mm |
| October | 8.8 °C | 21.8 °C | 85.34 mm |
| November | 2.8 °C | 15.3 °C | 117.35 mm |
| December | -0.1 °C | 10.1 °C | 159.77 mm |
| Annual | 8.8 °C | 20.7 °C | 1521.2 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 |