McDonald, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.3 °F (low) to 70.6 °F (high). Annual precipitation averages 59.3 Inches. 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 | 29.7 °F | 49.3 °F | 5.66 in. |
| February | 32.3 °F | 53.7 °F | 5.23 in. |
| March | 38.5 °F | 62.2 °F | 5.6 in. |
| April | 46.6 °F | 71.5 °F | 4.96 in. |
| May | 56.1 °F | 79.0 °F | 4.39 in. |
| June | 64.1 °F | 85.6 °F | 4.78 in. |
| July | 67.9 °F | 88.6 °F | 5.81 in. |
| August | 66.8 °F | 88.2 °F | 4.0 in. |
| September | 60.2 °F | 83.1 °F | 4.85 in. |
| October | 48.0 °F | 72.7 °F | 3.3 in. |
| November | 37.1 °F | 61.3 °F | 4.83 in. |
| December | 32.5 °F | 52.1 °F | 5.9 in. |
| Annual | 48.3 °F | 70.6 °F | 59.31 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |