White Mills, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.6 °C (low) to 14.4 °C (high). Annual precipitation averages 1165.1 Millimeters. 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 | -9.8 °C | 0.3 °C | 83.82 mm |
| February | -9.3 °C | 1.8 °C | 66.04 mm |
| March | -4.8 °C | 6.7 °C | 85.6 mm |
| April | 0.9 °C | 14.2 °C | 95.5 mm |
| May | 7.2 °C | 20.4 °C | 95.76 mm |
| June | 12.3 °C | 24.8 °C | 122.68 mm |
| July | 14.8 °C | 27.2 °C | 104.14 mm |
| August | 13.9 °C | 26.3 °C | 107.95 mm |
| September | 9.9 °C | 22.6 °C | 113.03 mm |
| October | 3.4 °C | 15.8 °C | 114.3 mm |
| November | -1.7 °C | 9.3 °C | 78.49 mm |
| December | -5.9 °C | 3.1 °C | 97.79 mm |
| Annual | 2.6 °C | 14.4 °C | 1165.1 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |