Donora, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.1 °F (low) to 62.8 °F (high). Annual precipitation averages 41 Inches. Donora 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 | 21.9 °F | 38.4 °F | 3.07 in. |
| February | 22.8 °F | 41.0 °F | 2.61 in. |
| March | 29.8 °F | 50.4 °F | 3.29 in. |
| April | 39.4 °F | 63.6 °F | 3.34 in. |
| May | 49.8 °F | 72.9 °F | 4.07 in. |
| June | 58.7 °F | 80.6 °F | 4.41 in. |
| July | 63.0 °F | 84.5 °F | 4.15 in. |
| August | 61.6 °F | 83.6 °F | 3.6 in. |
| September | 54.6 °F | 77.3 °F | 3.45 in. |
| October | 43.2 °F | 65.3 °F | 2.99 in. |
| November | 33.7 °F | 53.1 °F | 2.98 in. |
| December | 26.9 °F | 42.7 °F | 3.07 in. |
| Annual | 42.1 °F | 62.8 °F | 41.03 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 |