Greenfields, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.8 °F (low) to 63 °F (high). Annual precipitation averages 48.6 Inches. Greenfields is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.5 °F | 38.4 °F | 3.46 in. |
| February | 23.7 °F | 41.0 °F | 2.77 in. |
| March | 31.3 °F | 49.8 °F | 3.96 in. |
| April | 41.4 °F | 62.8 °F | 3.79 in. |
| May | 51.4 °F | 72.3 °F | 3.83 in. |
| June | 60.7 °F | 81.4 °F | 4.9 in. |
| July | 65.6 °F | 85.9 °F | 5.0 in. |
| August | 63.8 °F | 84.0 °F | 4.32 in. |
| September | 56.5 °F | 77.5 °F | 4.94 in. |
| October | 45.0 °F | 65.5 °F | 4.33 in. |
| November | 35.2 °F | 53.7 °F | 3.36 in. |
| December | 28.0 °F | 43.2 °F | 3.98 in. |
| Annual | 43.8 °F | 63 °F | 48.64 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |