Birchwood Lakes, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.1 °C (low) to 14.7 °C (high). Annual precipitation averages 1260.4 Millimeters. Birchwood Lakes is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.4 °C | 0.8 °C | 84.07 mm |
| February | -7.6 °C | 2.6 °C | 68.58 mm |
| March | -3.4 °C | 6.9 °C | 101.09 mm |
| April | 2.9 °C | 14.4 °C | 102.62 mm |
| May | 8.6 °C | 20.5 °C | 102.36 mm |
| June | 13.5 °C | 24.9 °C | 128.27 mm |
| July | 16.1 °C | 27.4 °C | 121.16 mm |
| August | 15.4 °C | 26.3 °C | 121.16 mm |
| September | 11.6 °C | 22.7 °C | 125.22 mm |
| October | 5.3 °C | 16.2 °C | 117.86 mm |
| November | -0.6 °C | 10.2 °C | 87.63 mm |
| December | -4.8 °C | 3.7 °C | 100.33 mm |
| Annual | 4.1 °C | 14.7 °C | 1260.35 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |