Salem, Utah has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.8 °C (low) to 18.1 °C (high). Annual precipitation averages 438.7 Millimeters. Salem is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 3.3 °C | 46.23 mm |
| February | -4.3 °C | 6.9 °C | 39.88 mm |
| March | -0.4 °C | 12.9 °C | 40.89 mm |
| April | 2.6 °C | 17.1 °C | 53.09 mm |
| May | 6.7 °C | 22.5 °C | 49.53 mm |
| June | 11 °C | 28.9 °C | 21.34 mm |
| July | 15.6 °C | 33.5 °C | 13.72 mm |
| August | 15.1 °C | 32.4 °C | 18.29 mm |
| September | 9.7 °C | 26.9 °C | 32.51 mm |
| October | 3.4 °C | 18.9 °C | 44.45 mm |
| November | -1.7 °C | 10.3 °C | 37.85 mm |
| December | -5.9 °C | 3.7 °C | 40.89 mm |
| Annual | 3.8 °C | 18.1 °C | 438.67 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°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 |