Salem, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.6 °C (low) to 14.8 °C (high). Annual precipitation averages 1178.6 Millimeters. Salem is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.3 °C | 2.6 °C | 95.76 mm |
| February | -5.4 °C | 3.7 °C | 88.39 mm |
| March | -1.7 °C | 7.1 °C | 116.08 mm |
| April | 3.7 °C | 13.3 °C | 100.33 mm |
| May | 9.1 °C | 18.6 °C | 88.14 mm |
| June | 14.3 °C | 23.8 °C | 101.09 mm |
| July | 17.6 °C | 27.2 °C | 89.92 mm |
| August | 17 °C | 26.5 °C | 82.8 mm |
| September | 13.1 °C | 22.6 °C | 88.65 mm |
| October | 7.2 °C | 16.4 °C | 114.55 mm |
| November | 1.9 °C | 10.7 °C | 94.74 mm |
| December | -2.8 °C | 5.6 °C | 118.11 mm |
| Annual | 5.6 °C | 14.8 °C | 1178.56 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |