Curwensville, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.6 °C (low) to 15.2 °C (high). Annual precipitation averages 1154.4 Millimeters. Curwensville 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 | -8.9 °C | 1.1 °C | 84.58 mm |
| February | -8.4 °C | 2.8 °C | 71.37 mm |
| March | -4.3 °C | 7.9 °C | 84.58 mm |
| April | 1.3 °C | 15.6 °C | 99.06 mm |
| May | 6.7 °C | 21.4 °C | 105.66 mm |
| June | 11.9 °C | 25.6 °C | 128.02 mm |
| July | 14.4 °C | 27.8 °C | 106.68 mm |
| August | 13.6 °C | 27 °C | 99.06 mm |
| September | 9.4 °C | 23.2 °C | 105.41 mm |
| October | 2.9 °C | 16.6 °C | 95 mm |
| November | -1.8 °C | 9.6 °C | 86.87 mm |
| December | -5.6 °C | 3.6 °C | 88.14 mm |
| Annual | 2.6 °C | 15.2 °C | 1154.43 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |