Middleton, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.7 °C (low) to 22 °C (high). Annual precipitation averages 1448.1 Millimeters. Middleton is located in USDA Plant Hardiness Zone 8a. 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 | -1.1 °C | 9.9 °C | 117.09 mm |
| February | 0.4 °C | 12.4 °C | 128.02 mm |
| March | 4.5 °C | 17.3 °C | 143.26 mm |
| April | 9.2 °C | 22.5 °C | 142.75 mm |
| May | 14.5 °C | 26.6 °C | 136.14 mm |
| June | 18.9 °C | 30.5 °C | 115.32 mm |
| July | 20.8 °C | 32.2 °C | 115.06 mm |
| August | 19.9 °C | 32.1 °C | 92.2 mm |
| September | 16 °C | 29.1 °C | 102.87 mm |
| October | 9.3 °C | 23.3 °C | 102.11 mm |
| November | 3.6 °C | 16.7 °C | 107.7 mm |
| December | 0.6 °C | 11.4 °C | 145.54 mm |
| Annual | 9.7 °C | 22 °C | 1448.06 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |