Connellsville, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 17.2 °C (high). Annual precipitation averages 1161.8 Millimeters. Connellsville 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.9 °C | 3.7 °C | 84.84 mm |
| February | -5.4 °C | 5.3 °C | 72.9 mm |
| March | -1.6 °C | 10.4 °C | 88.14 mm |
| April | 3.7 °C | 17.6 °C | 99.06 mm |
| May | 9.5 °C | 22.8 °C | 120.9 mm |
| June | 14.4 °C | 27.1 °C | 122.68 mm |
| July | 16.7 °C | 29.1 °C | 121.16 mm |
| August | 16 °C | 28.7 °C | 99.57 mm |
| September | 11.9 °C | 25.2 °C | 94.49 mm |
| October | 5.7 °C | 18.6 °C | 83.31 mm |
| November | 0.3 °C | 11.7 °C | 86.61 mm |
| December | -3.2 °C | 6.1 °C | 88.14 mm |
| Annual | 5.2 °C | 17.2 °C | 1161.8 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |