Johnsonburg, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.5 °F (low) to 57.4 °F (high). Annual precipitation averages 45.9 Inches. 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 | 14.8 °F | 32.1 °F | 3.5 in. |
| February | 15.2 °F | 35.0 °F | 2.62 in. |
| March | 22.2 °F | 43.9 °F | 3.35 in. |
| April | 32.5 °F | 57.8 °F | 4.0 in. |
| May | 42.9 °F | 69.0 °F | 4.2 in. |
| June | 51.8 °F | 76.1 °F | 4.51 in. |
| July | 56.0 °F | 80.0 °F | 4.51 in. |
| August | 54.6 °F | 78.5 °F | 4.09 in. |
| September | 48.1 °F | 72.1 °F | 4.03 in. |
| October | 37.4 °F | 60.1 °F | 3.84 in. |
| November | 28.8 °F | 47.2 °F | 3.67 in. |
| December | 21.5 °F | 36.5 °F | 3.61 in. |
| Annual | 35.5 °F | 57.4 °F | 45.93 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |