Bellefonte, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4 °C (low) to 15.7 °C (high). Annual precipitation averages 1040.9 Millimeters. Bellefonte 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 | -7.6 °C | 1.6 °C | 72.14 mm |
| February | -7.1 °C | 3.4 °C | 58.42 mm |
| March | -3.1 °C | 8.4 °C | 84.33 mm |
| April | 2.7 °C | 16 °C | 89.41 mm |
| May | 8.4 °C | 21.9 °C | 100.08 mm |
| June | 13.5 °C | 26.1 °C | 93.47 mm |
| July | 15.9 °C | 28.6 °C | 98.04 mm |
| August | 15 °C | 27.5 °C | 97.03 mm |
| September | 10.8 °C | 23.6 °C | 103.38 mm |
| October | 4.6 °C | 17 °C | 92.71 mm |
| November | -0.5 °C | 10.2 °C | 72.9 mm |
| December | -4.4 °C | 4.1 °C | 78.99 mm |
| Annual | 4 °C | 15.7 °C | 1040.9 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |