Pennsboro, West Virginia has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.3 °C (low) to 18 °C (high). Annual precipitation averages 1192.8 Millimeters. Pennsboro 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 | -5.9 °C | 4.4 °C | 85.85 mm |
| February | -4.9 °C | 6.6 °C | 82.55 mm |
| March | -1.4 °C | 11.9 °C | 107.19 mm |
| April | 4.2 °C | 19.3 °C | 97.03 mm |
| May | 9.8 °C | 23.7 °C | 123.19 mm |
| June | 14.6 °C | 27.6 °C | 119.13 mm |
| July | 17 °C | 29.3 °C | 131.06 mm |
| August | 16.1 °C | 28.8 °C | 103.38 mm |
| September | 12.1 °C | 25.9 °C | 91.44 mm |
| October | 5.2 °C | 19.3 °C | 81.28 mm |
| November | -0.2 °C | 12.7 °C | 79.76 mm |
| December | -3.4 °C | 6.9 °C | 90.93 mm |
| Annual | 5.3 °C | 18 °C | 1192.79 mm |
| 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 : -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 |