McDonald, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.4 °F (low) to 60.8 °F (high). Annual precipitation averages 41 Inches. McDonald is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.4 °F | 35.2 °F | 2.98 in. |
| February | 19.2 °F | 38.0 °F | 2.25 in. |
| March | 26.7 °F | 47.5 °F | 3.04 in. |
| April | 36.9 °F | 61.1 °F | 3.75 in. |
| May | 47.0 °F | 71.8 °F | 3.84 in. |
| June | 56.1 °F | 80.0 °F | 4.3 in. |
| July | 60.2 °F | 83.8 °F | 4.45 in. |
| August | 58.3 °F | 82.3 °F | 3.5 in. |
| September | 51.8 °F | 76.0 °F | 3.9 in. |
| October | 40.9 °F | 63.6 °F | 3.26 in. |
| November | 32.2 °F | 50.8 °F | 2.8 in. |
| December | 24.7 °F | 39.9 °F | 2.96 in. |
| Annual | 39.4 °F | 60.8 °F | 41.03 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |