Sugar Grove, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.3 °C (low) to 13.8 °C (high). Annual precipitation averages 1213.6 Millimeters. Sugar Grove is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.3 °C | -0.4 °C | 91.95 mm |
| February | -9.3 °C | 0.9 °C | 67.82 mm |
| March | -5.4 °C | 5.9 °C | 83.31 mm |
| April | 0.4 °C | 13.5 °C | 103.89 mm |
| May | 6.4 °C | 20.1 °C | 105.66 mm |
| June | 11.4 °C | 24.4 °C | 116.84 mm |
| July | 13.6 °C | 26.6 °C | 129.29 mm |
| August | 12.9 °C | 25.9 °C | 105.41 mm |
| September | 9.4 °C | 22.3 °C | 105.92 mm |
| October | 3.7 °C | 15.3 °C | 107.95 mm |
| November | -1.2 °C | 8.2 °C | 96.27 mm |
| December | -5.3 °C | 2.3 °C | 99.31 mm |
| Annual | 2.3 °C | 13.8 °C | 1213.62 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |