Troy, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.3 °C (low) to 14.5 °C (high). Annual precipitation averages 939.5 Millimeters. Troy 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 | -9.6 °C | 0.4 °C | 63.75 mm |
| February | -9.2 °C | 1.9 °C | 47.5 mm |
| March | -5.2 °C | 6.6 °C | 75.69 mm |
| April | 0.4 °C | 14.1 °C | 83.06 mm |
| May | 6.6 °C | 20.6 °C | 88.14 mm |
| June | 11.7 °C | 25.1 °C | 96.77 mm |
| July | 14.1 °C | 27.5 °C | 80.52 mm |
| August | 13.3 °C | 26.7 °C | 84.33 mm |
| September | 9.4 °C | 22.8 °C | 99.57 mm |
| October | 3.4 °C | 15.8 °C | 85.34 mm |
| November | -1.6 °C | 8.9 °C | 67.56 mm |
| December | -5.8 °C | 3.1 °C | 67.31 mm |
| Annual | 2.3 °C | 14.5 °C | 939.54 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 |