McDermott, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.9 °F (low) to 65.9 °F (high). Annual precipitation averages 43.8 Inches. McDermott is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.9 °F | 41.3 °F | 3.32 in. |
| February | 24.6 °F | 45.2 °F | 3.12 in. |
| March | 31.2 °F | 54.8 °F | 4.09 in. |
| April | 40.8 °F | 67.4 °F | 4.06 in. |
| May | 51.2 °F | 75.7 °F | 4.55 in. |
| June | 60.1 °F | 83.7 °F | 4.3 in. |
| July | 63.6 °F | 86.5 °F | 4.53 in. |
| August | 62.1 °F | 86.6 °F | 3.29 in. |
| September | 54.7 °F | 80.3 °F | 3.29 in. |
| October | 43.0 °F | 68.8 °F | 2.98 in. |
| November | 32.8 °F | 55.6 °F | 2.78 in. |
| December | 27.3 °F | 45.1 °F | 3.46 in. |
| Annual | 42.9 °F | 65.9 °F | 43.77 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |