Salem Heights, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.4 °C (low) to 15.3 °C (high). Annual precipitation averages 1034.8 Millimeters. Salem Heights is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.5 °C | 1 °C | 74.17 mm |
| February | -6.9 °C | 2.6 °C | 58.42 mm |
| March | -2.6 °C | 7.9 °C | 79.76 mm |
| April | 3.4 °C | 15.4 °C | 103.63 mm |
| May | 8.9 °C | 21.2 °C | 93.73 mm |
| June | 14.1 °C | 25.9 °C | 108.71 mm |
| July | 16.1 °C | 27.9 °C | 111 mm |
| August | 15 °C | 27.2 °C | 78.23 mm |
| September | 11.2 °C | 23.8 °C | 97.28 mm |
| October | 5.2 °C | 17.1 °C | 81.53 mm |
| November | 0.2 °C | 9.7 °C | 74.17 mm |
| December | -4.3 °C | 3.7 °C | 74.17 mm |
| Annual | 4.4 °C | 15.3 °C | 1034.8 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |