Donaldson, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.6 °F (low) to 60 °F (high). Annual precipitation averages 51.4 Inches. Donaldson is located in USDA Plant Hardiness Zone 6b. 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 | 18.2 °F | 35.2 °F | 3.62 in. |
| February | 19.7 °F | 37.8 °F | 2.77 in. |
| March | 27.6 °F | 46.6 °F | 4.11 in. |
| April | 37.9 °F | 59.8 °F | 4.12 in. |
| May | 47.8 °F | 69.9 °F | 4.29 in. |
| June | 56.6 °F | 78.2 °F | 5.01 in. |
| July | 60.4 °F | 83.2 °F | 5.0 in. |
| August | 58.7 °F | 81.5 °F | 4.48 in. |
| September | 51.6 °F | 74.6 °F | 5.31 in. |
| October | 40.5 °F | 62.9 °F | 4.89 in. |
| November | 31.6 °F | 50.3 °F | 3.76 in. |
| December | 24.1 °F | 39.9 °F | 4.02 in. |
| Annual | 39.6 °F | 60 °F | 51.38 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |