McDonald, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.1 °C (low) to 21.5 °C (high). Annual precipitation averages 1506.5 Millimeters. McDonald 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.3 °C | 9.6 °C | 143.76 mm |
| February | 0.2 °C | 12.1 °C | 132.84 mm |
| March | 3.6 °C | 16.8 °C | 142.24 mm |
| April | 8.1 °C | 21.9 °C | 125.98 mm |
| May | 13.4 °C | 26.1 °C | 111.51 mm |
| June | 17.8 °C | 29.8 °C | 121.41 mm |
| July | 19.9 °C | 31.4 °C | 147.57 mm |
| August | 19.3 °C | 31.2 °C | 101.6 mm |
| September | 15.7 °C | 28.4 °C | 123.19 mm |
| October | 8.9 °C | 22.6 °C | 83.82 mm |
| November | 2.8 °C | 16.3 °C | 122.68 mm |
| December | 0.3 °C | 11.2 °C | 149.86 mm |
| Annual | 9.1 °C | 21.5 °C | 1506.46 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |