Martinsburg, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 15.3 °C (high). Annual precipitation averages 1032.8 Millimeters. Martinsburg 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.8 °C | 1.6 °C | 74.17 mm |
| February | -6.1 °C | 3.3 °C | 62.74 mm |
| March | -2.3 °C | 8.1 °C | 88.14 mm |
| April | 3.6 °C | 15.6 °C | 92.71 mm |
| May | 9.2 °C | 21 °C | 95 mm |
| June | 14.1 °C | 25.4 °C | 97.28 mm |
| July | 16.3 °C | 27.8 °C | 88.39 mm |
| August | 15.4 °C | 27 °C | 86.36 mm |
| September | 11.6 °C | 23.3 °C | 98.3 mm |
| October | 5.7 °C | 16.8 °C | 87.38 mm |
| November | 0.3 °C | 9.9 °C | 79.25 mm |
| December | -3.9 °C | 3.9 °C | 83.06 mm |
| Annual | 4.8 °C | 15.3 °C | 1032.78 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |