Johnsonburg, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 14.1 °C (high). Annual precipitation averages 1166.6 Millimeters. Johnsonburg is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.6 °C | 0.1 °C | 88.9 mm |
| February | -9.3 °C | 1.7 °C | 66.55 mm |
| March | -5.4 °C | 6.6 °C | 85.09 mm |
| April | 0.3 °C | 14.3 °C | 101.6 mm |
| May | 6.1 °C | 20.6 °C | 106.68 mm |
| June | 11 °C | 24.5 °C | 114.55 mm |
| July | 13.3 °C | 26.7 °C | 114.55 mm |
| August | 12.6 °C | 25.8 °C | 103.89 mm |
| September | 8.9 °C | 22.3 °C | 102.36 mm |
| October | 3 °C | 15.6 °C | 97.54 mm |
| November | -1.8 °C | 8.4 °C | 93.22 mm |
| December | -5.8 °C | 2.5 °C | 91.69 mm |
| Annual | 1.9 °C | 14.1 °C | 1166.62 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| 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 |