Richfield, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.9 °C (low) to 14.9 °C (high). Annual precipitation averages 1085.1 Millimeters. 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 | -7.4 °C | 0.6 °C | 76.2 mm |
| February | -6.9 °C | 2.1 °C | 58.93 mm |
| March | -2.5 °C | 7.4 °C | 85.85 mm |
| April | 3.7 °C | 14.9 °C | 99.57 mm |
| May | 9.6 °C | 20.9 °C | 107.95 mm |
| June | 14.7 °C | 25.7 °C | 106.68 mm |
| July | 16.8 °C | 27.9 °C | 104.39 mm |
| August | 15.9 °C | 27.1 °C | 98.55 mm |
| September | 12.1 °C | 23.4 °C | 99.82 mm |
| October | 6.1 °C | 16.4 °C | 90.17 mm |
| November | 0.7 °C | 9.4 °C | 79.76 mm |
| December | -4.1 °C | 3.2 °C | 77.22 mm |
| Annual | 4.9 °C | 14.9 °C | 1085.09 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |