White Mills, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.7 °F (low) to 57.9 °F (high). Annual precipitation averages 45.9 Inches. White Mills 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.4 °F | 32.5 °F | 3.3 in. |
| February | 15.2 °F | 35.3 °F | 2.6 in. |
| March | 23.3 °F | 44.1 °F | 3.37 in. |
| April | 33.7 °F | 57.6 °F | 3.76 in. |
| May | 44.9 °F | 68.8 °F | 3.77 in. |
| June | 54.2 °F | 76.7 °F | 4.83 in. |
| July | 58.7 °F | 81.0 °F | 4.1 in. |
| August | 57.1 °F | 79.3 °F | 4.25 in. |
| September | 49.9 °F | 72.6 °F | 4.45 in. |
| October | 38.2 °F | 60.5 °F | 4.5 in. |
| November | 29.0 °F | 48.7 °F | 3.09 in. |
| December | 21.3 °F | 37.5 °F | 3.85 in. |
| Annual | 36.7 °F | 57.9 °F | 45.87 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |