Lake Wynonah, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.3 °C (low) to 16.3 °C (high). Annual precipitation averages 1295.4 Millimeters. Lake Wynonah is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.4 °C | 2.6 °C | 94.74 mm |
| February | -6.7 °C | 4.2 °C | 71.37 mm |
| March | -2.4 °C | 9 °C | 99.82 mm |
| April | 3.2 °C | 16 °C | 104.39 mm |
| May | 8.7 °C | 21.7 °C | 103.63 mm |
| June | 13.8 °C | 26.3 °C | 132.08 mm |
| July | 16.1 °C | 29 °C | 127.76 mm |
| August | 15.1 °C | 28.1 °C | 115.57 mm |
| September | 11.2 °C | 24.3 °C | 132.84 mm |
| October | 4.9 °C | 17.7 °C | 117.6 mm |
| November | -0.2 °C | 11.1 °C | 91.19 mm |
| December | -4.2 °C | 5.2 °C | 104.39 mm |
| Annual | 4.3 °C | 16.3 °C | 1295.38 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |