Hilldale, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.9 °C (low) to 16.1 °C (high). Annual precipitation averages 1078.5 Millimeters. Hilldale is located in USDA Plant Hardiness Zone 7a. 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 | -7.1 °C | 1.9 °C | 67.06 mm |
| February | -6.4 °C | 3.6 °C | 60.45 mm |
| March | -2.3 °C | 8.4 °C | 69.34 mm |
| April | 3.5 °C | 15.7 °C | 91.44 mm |
| May | 9.3 °C | 22.1 °C | 89.15 mm |
| June | 14.3 °C | 26.5 °C | 116.08 mm |
| July | 16.8 °C | 29.2 °C | 111.51 mm |
| August | 15.8 °C | 28.1 °C | 99.06 mm |
| September | 11.8 °C | 24.2 °C | 114.55 mm |
| October | 5.7 °C | 17.3 °C | 107.44 mm |
| November | 0.6 °C | 10.8 °C | 73.15 mm |
| December | -3.6 °C | 4.8 °C | 79.25 mm |
| Annual | 4.9 °C | 16.1 °C | 1078.48 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |