Martinsburg, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.6 °F (low) to 59.6 °F (high). Annual precipitation averages 40.7 Inches. 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 | 19.8 °F | 34.9 °F | 2.92 in. |
| February | 21.0 °F | 38.0 °F | 2.47 in. |
| March | 27.8 °F | 46.5 °F | 3.47 in. |
| April | 38.5 °F | 60.0 °F | 3.65 in. |
| May | 48.6 °F | 69.8 °F | 3.74 in. |
| June | 57.4 °F | 77.8 °F | 3.83 in. |
| July | 61.3 °F | 82.1 °F | 3.48 in. |
| August | 59.7 °F | 80.6 °F | 3.4 in. |
| September | 52.9 °F | 73.9 °F | 3.87 in. |
| October | 42.2 °F | 62.2 °F | 3.44 in. |
| November | 32.5 °F | 49.9 °F | 3.12 in. |
| December | 24.9 °F | 39.1 °F | 3.27 in. |
| Annual | 40.6 °F | 59.6 °F | 40.66 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |