Martinsburg, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.8 °F (low) to 51.4 °F (high). Annual precipitation averages 61.5 Inches. Martinsburg is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.4 °F | 24.7 °F | 5.8 in. |
| February | 8.0 °F | 27.3 °F | 4.11 in. |
| March | 16.1 °F | 35.7 °F | 4.46 in. |
| April | 29.3 °F | 49.7 °F | 4.42 in. |
| May | 41.3 °F | 63.6 °F | 4.68 in. |
| June | 49.8 °F | 71.5 °F | 4.6 in. |
| July | 54.4 °F | 75.6 °F | 4.39 in. |
| August | 53.1 °F | 74.7 °F | 5.07 in. |
| September | 46.2 °F | 67.7 °F | 5.57 in. |
| October | 35.9 °F | 54.9 °F | 7.17 in. |
| November | 25.7 °F | 41.2 °F | 5.54 in. |
| December | 14.8 °F | 30.0 °F | 5.7 in. |
| Annual | 31.8 °F | 51.4 °F | 61.51 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |