Byrnedale, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.5 °F (low) to 58.4 °F (high). Annual precipitation averages 41.1 Inches. Byrnedale 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 | 15.6 °F | 33.1 °F | 3.49 in. |
| February | 16.2 °F | 36.0 °F | 2.65 in. |
| March | 23.6 °F | 44.9 °F | 3.24 in. |
| April | 33.4 °F | 58.9 °F | 3.6 in. |
| May | 44.2 °F | 70.1 °F | 4.02 in. |
| June | 53.0 °F | 77.3 °F | 3.7 in. |
| July | 57.3 °F | 81.2 °F | 3.38 in. |
| August | 56.1 °F | 79.7 °F | 3.29 in. |
| September | 49.2 °F | 73.2 °F | 3.92 in. |
| October | 38.0 °F | 61.0 °F | 3.39 in. |
| November | 29.0 °F | 48.4 °F | 3.19 in. |
| December | 22.0 °F | 37.5 °F | 3.22 in. |
| Annual | 36.5 °F | 58.4 °F | 41.09 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |