Birmingham, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.1 °F (low) to 59.8 °F (high). Annual precipitation averages 43.3 Inches. Birmingham is located in USDA Plant Hardiness Zone 6b. 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 | 19.3 °F | 35.0 °F | 2.95 in. |
| February | 20.2 °F | 37.9 °F | 2.59 in. |
| March | 27.1 °F | 46.7 °F | 3.43 in. |
| April | 37.9 °F | 60.3 °F | 3.76 in. |
| May | 48.1 °F | 70.5 °F | 4.12 in. |
| June | 57.1 °F | 78.3 °F | 4.2 in. |
| July | 61.2 °F | 82.5 °F | 3.95 in. |
| August | 59.7 °F | 81.0 °F | 3.82 in. |
| September | 52.6 °F | 74.1 °F | 4.26 in. |
| October | 41.6 °F | 62.2 °F | 3.76 in. |
| November | 32.1 °F | 50.1 °F | 3.17 in. |
| December | 24.8 °F | 39.1 °F | 3.28 in. |
| Annual | 40.1 °F | 59.8 °F | 43.29 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 |