McKnightstown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6 °C (low) to 17.2 °C (high). Annual precipitation averages 1163.6 Millimeters. McKnightstown is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.6 °C | 3.7 °C | 87.38 mm |
| February | -4.8 °C | 5.4 °C | 69.6 mm |
| March | -0.9 °C | 10.2 °C | 99.57 mm |
| April | 4.8 °C | 17.1 °C | 100.33 mm |
| May | 10.3 °C | 22.4 °C | 111.51 mm |
| June | 15.4 °C | 27.3 °C | 102.62 mm |
| July | 17.9 °C | 29.9 °C | 98.04 mm |
| August | 16.9 °C | 28.8 °C | 97.28 mm |
| September | 12.9 °C | 25.1 °C | 121.67 mm |
| October | 6.6 °C | 18.5 °C | 101.09 mm |
| November | 1.1 °C | 12.1 °C | 82.55 mm |
| December | -2.9 °C | 6.1 °C | 91.95 mm |
| Annual | 6 °C | 17.2 °C | 1163.59 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |