Cassville, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 15.5 °C (high). Annual precipitation averages 1058.7 Millimeters. Cassville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 1.8 °C | 72.39 mm |
| February | -6.1 °C | 3.5 °C | 60.45 mm |
| March | -2.3 °C | 8.3 °C | 86.61 mm |
| April | 3.6 °C | 15.8 °C | 94.49 mm |
| May | 9.3 °C | 21.3 °C | 107.19 mm |
| June | 14.2 °C | 25.7 °C | 101.35 mm |
| July | 16.4 °C | 28.1 °C | 91.95 mm |
| August | 15.6 °C | 27.3 °C | 90.17 mm |
| September | 11.7 °C | 23.5 °C | 103.89 mm |
| October | 5.8 °C | 17 °C | 91.95 mm |
| November | 0.3 °C | 10.1 °C | 76.45 mm |
| December | -3.9 °C | 4.1 °C | 81.79 mm |
| Annual | 4.8 °C | 15.5 °C | 1058.68 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |