Prospect, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.9 °C (low) to 15.8 °C (high). Annual precipitation averages 1088.7 Millimeters. Prospect is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.8 °C | 1.8 °C | 82.3 mm |
| February | -7.1 °C | 3.6 °C | 64.52 mm |
| March | -3.2 °C | 8.6 °C | 81.79 mm |
| April | 2.7 °C | 15.9 °C | 97.03 mm |
| May | 8.3 °C | 21.7 °C | 97.79 mm |
| June | 13.3 °C | 26.1 °C | 114.05 mm |
| July | 15.3 °C | 28.2 °C | 111 mm |
| August | 14.4 °C | 27.5 °C | 96.27 mm |
| September | 10.6 °C | 24.1 °C | 98.3 mm |
| October | 4.6 °C | 17.1 °C | 82.3 mm |
| November | -0.2 °C | 10.3 °C | 82.3 mm |
| December | -4.4 °C | 4.3 °C | 81.03 mm |
| Annual | 3.9 °C | 15.8 °C | 1088.68 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |