Blossburg, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.8 °C (low) to 14.1 °C (high). Annual precipitation averages 994.4 Millimeters. Blossburg is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.2 °C | 0 °C | 66.55 mm |
| February | -9.6 °C | 1.6 °C | 51.31 mm |
| March | -5.7 °C | 6.3 °C | 73.41 mm |
| April | 0.1 °C | 13.9 °C | 86.87 mm |
| May | 6.1 °C | 20.5 °C | 85.34 mm |
| June | 11.1 °C | 24.8 °C | 99.06 mm |
| July | 13.4 °C | 27.2 °C | 99.31 mm |
| August | 12.8 °C | 26.3 °C | 90.68 mm |
| September | 8.9 °C | 22.4 °C | 106.43 mm |
| October | 3 °C | 15.6 °C | 92.71 mm |
| November | -1.9 °C | 8.4 °C | 71.37 mm |
| December | -6.2 °C | 2.6 °C | 71.37 mm |
| Annual | 1.8 °C | 14.1 °C | 994.41 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |