Parma, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.7 °C (low) to 15.2 °C (high). Annual precipitation averages 1121.7 Millimeters. Parma is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 1.2 °C | 79.25 mm |
| February | -6.1 °C | 2.5 °C | 60.2 mm |
| March | -2 °C | 7.4 °C | 93.22 mm |
| April | 4.2 °C | 14.6 °C | 106.93 mm |
| May | 10.3 °C | 20.9 °C | 106.93 mm |
| June | 15.5 °C | 25.8 °C | 106.68 mm |
| July | 17.7 °C | 27.9 °C | 97.79 mm |
| August | 16.9 °C | 27.2 °C | 102.62 mm |
| September | 13.2 °C | 23.7 °C | 104.65 mm |
| October | 7.3 °C | 16.9 °C | 97.28 mm |
| November | 1.7 °C | 10.1 °C | 84.33 mm |
| December | -3.2 °C | 3.9 °C | 81.79 mm |
| Annual | 5.7 °C | 15.2 °C | 1121.67 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |