Winfield, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.8 °F (low) to 61.1 °F (high). Annual precipitation averages 45 Inches. Winfield is located in USDA Plant Hardiness Zone 6b. 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 | 19.6 °F | 35.7 °F | 3.11 in. |
| February | 20.7 °F | 38.7 °F | 2.48 in. |
| March | 28.2 °F | 48.1 °F | 3.37 in. |
| April | 38.2 °F | 61.5 °F | 3.8 in. |
| May | 48.8 °F | 71.8 °F | 4.11 in. |
| June | 58.2 °F | 79.9 °F | 4.14 in. |
| July | 62.2 °F | 84.4 °F | 4.44 in. |
| August | 60.7 °F | 82.5 °F | 4.29 in. |
| September | 53.2 °F | 75.8 °F | 4.65 in. |
| October | 42.0 °F | 63.4 °F | 4.09 in. |
| November | 32.3 °F | 51.4 °F | 3.06 in. |
| December | 25.2 °F | 40.3 °F | 3.44 in. |
| Annual | 40.8 °F | 61.1 °F | 44.98 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°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 |