Richfield, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.8 °F (low) to 58.9 °F (high). Annual precipitation averages 42.7 Inches. Richfield 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 | 18.6 °F | 33.1 °F | 3.0 in. |
| February | 19.6 °F | 35.8 °F | 2.32 in. |
| March | 27.5 °F | 45.3 °F | 3.38 in. |
| April | 38.6 °F | 58.9 °F | 3.92 in. |
| May | 49.3 °F | 69.7 °F | 4.25 in. |
| June | 58.5 °F | 78.3 °F | 4.2 in. |
| July | 62.2 °F | 82.2 °F | 4.11 in. |
| August | 60.6 °F | 80.8 °F | 3.88 in. |
| September | 53.7 °F | 74.2 °F | 3.93 in. |
| October | 42.9 °F | 61.6 °F | 3.55 in. |
| November | 33.2 °F | 49.0 °F | 3.14 in. |
| December | 24.7 °F | 37.8 °F | 3.04 in. |
| Annual | 40.8 °F | 58.9 °F | 42.72 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |