Sandy Lake, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.5 °C (low) to 15.1 °C (high). Annual precipitation averages 1152.1 Millimeters. Sandy Lake is located in USDA Plant Hardiness Zone 6a. 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 | -8.2 °C | 1.1 °C | 83.82 mm |
| February | -8 °C | 2.6 °C | 64.01 mm |
| March | -3.8 °C | 7.6 °C | 83.82 mm |
| April | 1.9 °C | 15.1 °C | 103.63 mm |
| May | 7.8 °C | 21.2 °C | 100.84 mm |
| June | 12.8 °C | 25.6 °C | 124.46 mm |
| July | 15.1 °C | 27.7 °C | 122.43 mm |
| August | 14.2 °C | 26.9 °C | 100.33 mm |
| September | 10.5 °C | 23.4 °C | 105.41 mm |
| October | 4.6 °C | 16.7 °C | 90.93 mm |
| November | -0.3 °C | 9.7 °C | 85.34 mm |
| December | -4.7 °C | 3.6 °C | 87.12 mm |
| Annual | 3.5 °C | 15.1 °C | 1152.14 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 6a : -23.3°C to -20.6°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 |