Salem, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.7 °C (low) to 14.3 °C (high). Annual precipitation averages 1035 Millimeters. Salem is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.8 °C | -0.6 °C | 72.64 mm |
| February | -11.2 °C | 1.3 °C | 55.37 mm |
| March | -5.9 °C | 6.1 °C | 78.74 mm |
| April | 0.8 °C | 14.1 °C | 78.23 mm |
| May | 6.7 °C | 20.7 °C | 90.42 mm |
| June | 11.8 °C | 25 °C | 111.25 mm |
| July | 14.2 °C | 27.7 °C | 99.06 mm |
| August | 13.3 °C | 26.9 °C | 104.9 mm |
| September | 8.9 °C | 23.1 °C | 93.22 mm |
| October | 2.9 °C | 15.9 °C | 97.54 mm |
| November | -2 °C | 8.9 °C | 76.2 mm |
| December | -7 °C | 2.5 °C | 77.47 mm |
| Annual | 1.7 °C | 14.3 °C | 1035.04 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°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 |