Sewanee, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 19 °C (high). Annual precipitation averages 1652.5 Millimeters. Sewanee 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 | -1.7 °C | 7.2 °C | 135.38 mm |
| February | -0.4 °C | 9.4 °C | 144.02 mm |
| March | 3.7 °C | 14.2 °C | 155.19 mm |
| April | 8.4 °C | 19.4 °C | 162.56 mm |
| May | 13.3 °C | 23.5 °C | 129.29 mm |
| June | 17.3 °C | 27.2 °C | 143.76 mm |
| July | 19.1 °C | 28.8 °C | 141.22 mm |
| August | 18.4 °C | 28.7 °C | 124.21 mm |
| September | 15.5 °C | 25.8 °C | 121.67 mm |
| October | 9.3 °C | 20.3 °C | 95.76 mm |
| November | 4.1 °C | 14.2 °C | 123.7 mm |
| December | 0.2 °C | 9.1 °C | 175.77 mm |
| Annual | 8.9 °C | 19 °C | 1652.53 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |