Slabtown, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.5 °C (low) to 15.9 °C (high). Annual precipitation averages 1189 Millimeters. Slabtown 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.4 °C | 1.9 °C | 85.6 mm |
| February | -6.6 °C | 3.6 °C | 64.77 mm |
| March | -2.4 °C | 8.4 °C | 90.42 mm |
| April | 3.3 °C | 15.9 °C | 102.87 mm |
| May | 8.8 °C | 21.7 °C | 103.38 mm |
| June | 13.8 °C | 26.1 °C | 117.09 mm |
| July | 16.2 °C | 28.7 °C | 112.01 mm |
| August | 15.2 °C | 27.7 °C | 103.38 mm |
| September | 11.3 °C | 24 °C | 123.44 mm |
| October | 5.2 °C | 17.2 °C | 109.22 mm |
| November | 0.1 °C | 10.4 °C | 86.87 mm |
| December | -4.1 °C | 4.6 °C | 89.92 mm |
| Annual | 4.5 °C | 15.9 °C | 1188.97 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |