Finleyville, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.5 °C (low) to 16.5 °C (high). Annual precipitation averages 1061.2 Millimeters. Finleyville 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6 °C | 2.8 °C | 80.77 mm |
| February | -5.3 °C | 4.3 °C | 65.28 mm |
| March | -1.4 °C | 9.5 °C | 84.07 mm |
| April | 4.2 °C | 16.9 °C | 84.84 mm |
| May | 9.9 °C | 22.2 °C | 106.93 mm |
| June | 14.8 °C | 26.5 °C | 111.76 mm |
| July | 17.2 °C | 28.7 °C | 113.03 mm |
| August | 16.3 °C | 28.1 °C | 90.17 mm |
| September | 12.5 °C | 24.5 °C | 90.17 mm |
| October | 6.2 °C | 17.8 °C | 75.95 mm |
| November | 0.9 °C | 11.1 °C | 77.72 mm |
| December | -3.1 °C | 5.3 °C | 80.52 mm |
| Annual | 5.5 °C | 16.5 °C | 1061.21 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |