Slatington, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 16.5 °C (high). Annual precipitation averages 1260.4 Millimeters. Slatington is located in USDA Plant Hardiness Zone 7a. 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 | -6.5 °C | 2.8 °C | 88.9 mm |
| February | -5.9 °C | 4.4 °C | 68.58 mm |
| March | -1.8 °C | 9.1 °C | 92.71 mm |
| April | 3.8 °C | 16.4 °C | 98.55 mm |
| May | 9.5 °C | 22.1 °C | 103.38 mm |
| June | 14.6 °C | 26.6 °C | 127.51 mm |
| July | 17.2 °C | 29.1 °C | 126.24 mm |
| August | 16.2 °C | 28.2 °C | 120.65 mm |
| September | 12.1 °C | 24.4 °C | 130.05 mm |
| October | 5.6 °C | 17.8 °C | 116.84 mm |
| November | 0.3 °C | 11.3 °C | 85.6 mm |
| December | -3.6 °C | 5.4 °C | 101.35 mm |
| Annual | 5.1 °C | 16.5 °C | 1260.36 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 7a : -17.8°C to -15°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 |