Rocky River, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.6 °C (low) to 15.4 °C (high). Annual precipitation averages 1046.5 Millimeters. Rocky River is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.7 °C | 1.7 °C | 75.95 mm |
| February | -5.2 °C | 2.9 °C | 56.64 mm |
| March | -1.6 °C | 7.4 °C | 82.55 mm |
| April | 4.7 °C | 14.8 °C | 99.31 mm |
| May | 10.9 °C | 20.8 °C | 96.77 mm |
| June | 16.4 °C | 25.9 °C | 99.82 mm |
| July | 18.8 °C | 27.7 °C | 94.49 mm |
| August | 18.2 °C | 27.2 °C | 95 mm |
| September | 14.5 °C | 23.8 °C | 98.04 mm |
| October | 8.3 °C | 17.5 °C | 90.68 mm |
| November | 2.7 °C | 10.4 °C | 78.99 mm |
| December | -2.4 °C | 4.5 °C | 78.23 mm |
| Annual | 6.6 °C | 15.4 °C | 1046.47 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |