Summit Hill, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.8 °C (low) to 14.4 °C (high). Annual precipitation averages 1389.1 Millimeters. Summit Hill 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 0.8 °C | 98.81 mm |
| February | -7.4 °C | 2.4 °C | 78.23 mm |
| March | -3.4 °C | 7.1 °C | 106.17 mm |
| April | 2.4 °C | 14.3 °C | 114.81 mm |
| May | 8.2 °C | 20.2 °C | 112.78 mm |
| June | 13.1 °C | 24.4 °C | 141.73 mm |
| July | 15.7 °C | 26.9 °C | 129.29 mm |
| August | 14.6 °C | 26 °C | 123.44 mm |
| September | 10.9 °C | 22.3 °C | 136.91 mm |
| October | 4.8 °C | 16 °C | 131.83 mm |
| November | -0.4 °C | 9.3 °C | 103.38 mm |
| December | -5 °C | 3.5 °C | 111.76 mm |
| Annual | 3.8 °C | 14.4 °C | 1389.14 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |