Parma, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.4 °F (low) to 59.3 °F (high). Annual precipitation averages 44.2 Inches. 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 | 20.1 °F | 34.2 °F | 3.12 in. |
| February | 21.0 °F | 36.5 °F | 2.37 in. |
| March | 28.4 °F | 45.3 °F | 3.67 in. |
| April | 39.6 °F | 58.2 °F | 4.21 in. |
| May | 50.5 °F | 69.6 °F | 4.21 in. |
| June | 59.9 °F | 78.5 °F | 4.2 in. |
| July | 63.9 °F | 82.3 °F | 3.85 in. |
| August | 62.5 °F | 81.0 °F | 4.04 in. |
| September | 55.8 °F | 74.6 °F | 4.12 in. |
| October | 45.1 °F | 62.4 °F | 3.83 in. |
| November | 35.1 °F | 50.1 °F | 3.32 in. |
| December | 26.3 °F | 39.0 °F | 3.22 in. |
| Annual | 42.4 °F | 59.3 °F | 44.16 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |