Richfield, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.6 °C (low) to 16.3 °C (high). Annual precipitation averages 1195.8 Millimeters. Richfield is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.1 °C | 2.2 °C | 86.61 mm |
| February | -6.4 °C | 3.9 °C | 64.01 mm |
| March | -2.4 °C | 9 °C | 90.68 mm |
| April | 3.3 °C | 16.4 °C | 96.01 mm |
| May | 9 °C | 22.2 °C | 107.7 mm |
| June | 14.2 °C | 26.8 °C | 113.28 mm |
| July | 16.3 °C | 29.2 °C | 110.24 mm |
| August | 15.5 °C | 28.2 °C | 113.79 mm |
| September | 11.4 °C | 24.3 °C | 123.7 mm |
| October | 5.2 °C | 17.6 °C | 113.03 mm |
| November | -0.1 °C | 10.9 °C | 84.07 mm |
| December | -4.1 °C | 4.7 °C | 92.71 mm |
| Annual | 4.6 °C | 16.3 °C | 1195.83 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |