North Royalton, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.2 °F (low) to 58.7 °F (high). Annual precipitation averages 45.2 Inches. North Royalton is located in USDA Plant Hardiness Zone 6a. 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 | 18.1 °F | 32.8 °F | 3.16 in. |
| February | 19.1 °F | 35.3 °F | 2.42 in. |
| March | 26.8 °F | 44.9 °F | 3.74 in. |
| April | 38.2 °F | 58.4 °F | 4.23 in. |
| May | 48.5 °F | 70.0 °F | 4.45 in. |
| June | 57.9 °F | 78.2 °F | 4.3 in. |
| July | 61.7 °F | 82.6 °F | 4.04 in. |
| August | 59.8 °F | 80.9 °F | 4.19 in. |
| September | 52.9 °F | 74.1 °F | 4.24 in. |
| October | 42.4 °F | 61.2 °F | 3.86 in. |
| November | 33.1 °F | 48.7 °F | 3.35 in. |
| December | 24.3 °F | 37.4 °F | 3.24 in. |
| Annual | 40.2 °F | 58.7 °F | 45.22 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |