Mill Hall, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.3 °C (low) to 16.3 °C (high). Annual precipitation averages 1050.8 Millimeters. Mill Hall 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.3 °C | 1.8 °C | 71.37 mm |
| February | -6.8 °C | 3.7 °C | 55.37 mm |
| March | -2.8 °C | 8.9 °C | 77.98 mm |
| April | 2.8 °C | 16.7 °C | 90.42 mm |
| May | 8.7 °C | 22.8 °C | 98.04 mm |
| June | 13.8 °C | 27 °C | 95.5 mm |
| July | 16.3 °C | 29.5 °C | 108.46 mm |
| August | 15.4 °C | 28.3 °C | 105.16 mm |
| September | 11.3 °C | 24.2 °C | 108.2 mm |
| October | 5 °C | 17.7 °C | 89.66 mm |
| November | -0.3 °C | 10.4 °C | 74.93 mm |
| December | -4.1 °C | 4.2 °C | 75.69 mm |
| Annual | 4.3 °C | 16.3 °C | 1050.78 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |