McDonald, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.7 °F (low) to 61.4 °F (high). Annual precipitation averages 42 Inches. McDonald 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 | 20.8 °F | 36.8 °F | 3.32 in. |
| February | 22.1 °F | 39.6 °F | 2.6 in. |
| March | 29.2 °F | 49.0 °F | 3.36 in. |
| April | 39.4 °F | 62.2 °F | 3.55 in. |
| May | 49.5 °F | 71.7 °F | 4.09 in. |
| June | 58.3 °F | 79.6 °F | 4.33 in. |
| July | 62.5 °F | 83.5 °F | 4.39 in. |
| August | 61.1 °F | 82.2 °F | 3.46 in. |
| September | 54.3 °F | 75.9 °F | 3.53 in. |
| October | 42.9 °F | 63.7 °F | 3.09 in. |
| November | 33.5 °F | 51.7 °F | 3.0 in. |
| December | 26.2 °F | 41.4 °F | 3.25 in. |
| Annual | 41.7 °F | 61.4 °F | 41.97 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |