Martinsburg, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.1 °C (low) to 10.8 °C (high). Annual precipitation averages 1562.4 Millimeters. 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 | -14.2 °C | -4.1 °C | 147.32 mm |
| February | -13.3 °C | -2.6 °C | 104.39 mm |
| March | -8.8 °C | 2.1 °C | 113.28 mm |
| April | -1.5 °C | 9.8 °C | 112.27 mm |
| May | 5.2 °C | 17.6 °C | 118.87 mm |
| June | 9.9 °C | 21.9 °C | 116.84 mm |
| July | 12.4 °C | 24.2 °C | 111.51 mm |
| August | 11.7 °C | 23.7 °C | 128.78 mm |
| September | 7.9 °C | 19.8 °C | 141.48 mm |
| October | 2.2 °C | 12.7 °C | 182.12 mm |
| November | -3.5 °C | 5.1 °C | 140.72 mm |
| December | -9.6 °C | -1.1 °C | 144.78 mm |
| Annual | -0.1 °C | 10.8 °C | 1562.36 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |