Roxbury, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.8 °C (low) to 10.9 °C (high). Annual precipitation averages 1248.1 Millimeters. Roxbury is located in USDA Plant Hardiness Zone 5b. 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 | -11.3 °C | -2.6 °C | 84.58 mm |
| February | -10.9 °C | -1.1 °C | 61.72 mm |
| March | -7.1 °C | 2.9 °C | 97.79 mm |
| April | -0.9 °C | 10.4 °C | 89.66 mm |
| May | 5.2 °C | 16.7 °C | 102.36 mm |
| June | 9.9 °C | 21.1 °C | 139.95 mm |
| July | 12.3 °C | 23.2 °C | 141.73 mm |
| August | 11.8 °C | 22.6 °C | 119.89 mm |
| September | 8.2 °C | 19.2 °C | 116.84 mm |
| October | 2.6 °C | 12.7 °C | 125.98 mm |
| November | -2.8 °C | 5.7 °C | 78.74 mm |
| December | -7.8 °C | -0.1 °C | 88.9 mm |
| Annual | 0.8 °C | 10.9 °C | 1248.14 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |