Sunbury, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 16.2 °C (high). Annual precipitation averages 1129.3 Millimeters. Sunbury 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 | -6.9 °C | 2.1 °C | 80.52 mm |
| February | -6.3 °C | 3.7 °C | 59.69 mm |
| March | -2.1 °C | 8.9 °C | 83.31 mm |
| April | 3.4 °C | 16.4 °C | 96.01 mm |
| May | 9.4 °C | 22.1 °C | 97.03 mm |
| June | 14.6 °C | 26.7 °C | 109.22 mm |
| July | 16.8 °C | 29.1 °C | 111.76 mm |
| August | 15.9 °C | 28.1 °C | 103.89 mm |
| September | 11.8 °C | 24.4 °C | 119.63 mm |
| October | 5.6 °C | 17.5 °C | 104.14 mm |
| November | 0.2 °C | 10.8 °C | 77.47 mm |
| December | -3.8 °C | 4.7 °C | 86.61 mm |
| Annual | 4.9 °C | 16.2 °C | 1129.28 mm |
| 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 : -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 |