Berwick, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41.2 °F (low) to 62.3 °F (high). Annual precipitation averages 43.5 Inches. Berwick is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.0 °F | 36.8 °F | 2.82 in. |
| February | 21.4 °F | 39.6 °F | 2.23 in. |
| March | 28.6 °F | 48.4 °F | 2.93 in. |
| April | 38.8 °F | 62.5 °F | 3.81 in. |
| May | 48.8 °F | 73.4 °F | 3.82 in. |
| June | 58.1 °F | 81.2 °F | 4.73 in. |
| July | 62.5 °F | 85.8 °F | 4.66 in. |
| August | 60.8 °F | 83.9 °F | 4.17 in. |
| September | 53.6 °F | 77.1 °F | 4.85 in. |
| October | 42.3 °F | 64.8 °F | 3.64 in. |
| November | 33.2 °F | 52.1 °F | 2.86 in. |
| December | 25.8 °F | 41.5 °F | 3.0 in. |
| Annual | 41.2 °F | 62.3 °F | 43.52 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |