Cottage Grove, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 20.2 °C (high). Annual precipitation averages 1385.6 Millimeters. Cottage Grove is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.7 °C | 7.3 °C | 104.14 mm |
| February | -1.2 °C | 9.8 °C | 113.79 mm |
| March | 3.2 °C | 15.2 °C | 131.32 mm |
| April | 8.6 °C | 20.8 °C | 132.33 mm |
| May | 13.9 °C | 25.3 °C | 146.3 mm |
| June | 18.4 °C | 29.3 °C | 118.36 mm |
| July | 20.3 °C | 30.9 °C | 109.98 mm |
| August | 19.2 °C | 31 °C | 88.14 mm |
| September | 15.2 °C | 27.6 °C | 97.54 mm |
| October | 8.5 °C | 21.5 °C | 97.28 mm |
| November | 2.8 °C | 14.7 °C | 114.3 mm |
| December | -0.8 °C | 9 °C | 132.08 mm |
| Annual | 8.8 °C | 20.2 °C | 1385.56 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 |