McElhattan, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.3 °C (low) to 16.3 °C (high). Annual precipitation averages 1062.2 Millimeters. McElhattan is located in USDA Plant Hardiness Zone 6b. 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 | -7.3 °C | 1.8 °C | 72.9 mm |
| February | -6.8 °C | 3.7 °C | 57.91 mm |
| March | -2.8 °C | 8.9 °C | 80.26 mm |
| April | 2.8 °C | 16.7 °C | 88.9 mm |
| May | 8.7 °C | 22.8 °C | 99.57 mm |
| June | 13.8 °C | 27 °C | 96.52 mm |
| July | 16.2 °C | 29.5 °C | 110.49 mm |
| August | 15.3 °C | 28.3 °C | 104.9 mm |
| September | 11.3 °C | 24.2 °C | 110.49 mm |
| October | 5 °C | 17.7 °C | 87.63 mm |
| November | -0.4 °C | 10.4 °C | 76.2 mm |
| December | -4.2 °C | 4.2 °C | 76.45 mm |
| Annual | 4.3 °C | 16.3 °C | 1062.22 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |