Erwin, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 44.7 °F (low) to 68.2 °F (high). Annual precipitation averages 47 Inches. Erwin 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 | 26.1 °F | 46.9 °F | 3.46 in. |
| February | 28.6 °F | 50.8 °F | 3.24 in. |
| March | 34.8 °F | 59.1 °F | 3.88 in. |
| April | 42.9 °F | 69.3 °F | 4.0 in. |
| May | 52.1 °F | 76.9 °F | 4.7 in. |
| June | 60.2 °F | 83.2 °F | 4.77 in. |
| July | 63.9 °F | 85.9 °F | 5.76 in. |
| August | 62.9 °F | 85.3 °F | 4.66 in. |
| September | 56.6 °F | 80.7 °F | 3.26 in. |
| October | 44.9 °F | 70.6 °F | 2.48 in. |
| November | 34.4 °F | 59.2 °F | 2.89 in. |
| December | 29.4 °F | 50.0 °F | 3.86 in. |
| Annual | 44.7 °F | 68.2 °F | 46.96 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |