Collinwood, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8 °C (low) to 20.7 °C (high). Annual precipitation averages 1562.9 Millimeters. Collinwood 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 | -2.8 °C | 8.8 °C | 138.43 mm |
| February | -1.2 °C | 11.4 °C | 144.27 mm |
| March | 2.5 °C | 16.1 °C | 141.73 mm |
| April | 7.2 °C | 21.5 °C | 139.95 mm |
| May | 12.3 °C | 25.1 °C | 132.84 mm |
| June | 16.8 °C | 28.8 °C | 131.06 mm |
| July | 18.9 °C | 30.6 °C | 135.64 mm |
| August | 18.3 °C | 30.4 °C | 114.05 mm |
| September | 14.5 °C | 27.7 °C | 117.09 mm |
| October | 7.6 °C | 22 °C | 97.79 mm |
| November | 2.4 °C | 15.6 °C | 110.49 mm |
| December | -0.9 °C | 10.3 °C | 159.51 mm |
| Annual | 8 °C | 20.7 °C | 1562.85 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 |