Rocky River, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44 °F (low) to 59.7 °F (high). Annual precipitation averages 41.2 Inches. 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 | 21.7 °F | 35.1 °F | 2.99 in. |
| February | 22.7 °F | 37.2 °F | 2.23 in. |
| March | 29.2 °F | 45.3 °F | 3.25 in. |
| April | 40.5 °F | 58.7 °F | 3.91 in. |
| May | 51.7 °F | 69.5 °F | 3.81 in. |
| June | 61.5 °F | 78.6 °F | 3.93 in. |
| July | 65.8 °F | 81.8 °F | 3.72 in. |
| August | 64.8 °F | 80.9 °F | 3.74 in. |
| September | 58.1 °F | 74.9 °F | 3.86 in. |
| October | 47.0 °F | 63.5 °F | 3.57 in. |
| November | 36.8 °F | 50.8 °F | 3.11 in. |
| December | 27.6 °F | 40.1 °F | 3.08 in. |
| Annual | 44 °F | 59.7 °F | 41.2 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |