West Alexander, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.7 °C (low) to 16.2 °C (high). Annual precipitation averages 1059.2 Millimeters. West Alexander is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 2.7 °C | 84.84 mm |
| February | -5.9 °C | 4.2 °C | 64.52 mm |
| March | -1.9 °C | 9.5 °C | 84.58 mm |
| April | 3.9 °C | 16.8 °C | 86.61 mm |
| May | 9.1 °C | 21.9 °C | 106.17 mm |
| June | 14 °C | 26 °C | 107.19 mm |
| July | 16 °C | 28.1 °C | 104.14 mm |
| August | 14.9 °C | 27.6 °C | 89.41 mm |
| September | 11.3 °C | 24.2 °C | 96.01 mm |
| October | 5.1 °C | 17.6 °C | 77.47 mm |
| November | 0.3 °C | 10.9 °C | 77.47 mm |
| December | -3.9 °C | 5 °C | 80.77 mm |
| Annual | 4.7 °C | 16.2 °C | 1059.18 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |