Mount Pleasant, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.5 °C (low) to 16.3 °C (high). Annual precipitation averages 1143.3 Millimeters. Mount Pleasant 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 3 °C | 85.09 mm |
| February | -6.2 °C | 4.4 °C | 72.39 mm |
| March | -2.3 °C | 9.6 °C | 90.42 mm |
| April | 3.1 °C | 16.6 °C | 96.52 mm |
| May | 8.8 °C | 21.8 °C | 107.95 mm |
| June | 13.7 °C | 26.1 °C | 121.92 mm |
| July | 16.1 °C | 28.2 °C | 118.87 mm |
| August | 15.2 °C | 27.8 °C | 100.58 mm |
| September | 11.1 °C | 24.3 °C | 96.27 mm |
| October | 4.8 °C | 17.7 °C | 84.07 mm |
| November | -0.2 °C | 11 °C | 84.84 mm |
| December | -3.9 °C | 5.3 °C | 84.33 mm |
| Annual | 4.5 °C | 16.3 °C | 1143.25 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |