Slatedale, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.7 °C (low) to 16.3 °C (high). Annual precipitation averages 1309.6 Millimeters. Slatedale 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 | -6.9 °C | 2.7 °C | 91.95 mm |
| February | -6.3 °C | 4.3 °C | 72.9 mm |
| March | -2.3 °C | 8.8 °C | 96.01 mm |
| April | 3.4 °C | 16.2 °C | 104.65 mm |
| May | 9.1 °C | 21.9 °C | 108.2 mm |
| June | 14.1 °C | 26.4 °C | 133.6 mm |
| July | 16.7 °C | 28.9 °C | 129.29 mm |
| August | 15.7 °C | 27.9 °C | 121.41 mm |
| September | 11.6 °C | 24.2 °C | 132.33 mm |
| October | 5.1 °C | 17.6 °C | 120.4 mm |
| November | -0.1 °C | 11.1 °C | 92.2 mm |
| December | -4.1 °C | 5.2 °C | 106.68 mm |
| Annual | 4.7 °C | 16.3 °C | 1309.62 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |