Tionesta, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.4 °C (low) to 15.4 °C (high). Annual precipitation averages 1180.1 Millimeters. Tionesta 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8 °C | 1.1 °C | 87.38 mm |
| February | -7.9 °C | 2.6 °C | 65.28 mm |
| March | -4.1 °C | 7.7 °C | 85.09 mm |
| April | 1.5 °C | 15.7 °C | 103.89 mm |
| May | 7.5 °C | 21.8 °C | 105.41 mm |
| June | 12.6 °C | 26.2 °C | 124.71 mm |
| July | 14.9 °C | 28.2 °C | 126.49 mm |
| August | 14.3 °C | 27.6 °C | 100.33 mm |
| September | 10.7 °C | 23.8 °C | 104.65 mm |
| October | 4.5 °C | 16.9 °C | 95 mm |
| November | -0.7 °C | 9.7 °C | 89.92 mm |
| December | -4.7 °C | 3.6 °C | 91.95 mm |
| Annual | 3.4 °C | 15.4 °C | 1180.1 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 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 |