McKnightstown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.8 °F (low) to 63 °F (high). Annual precipitation averages 45.8 Inches. 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 | 21.9 °F | 38.6 °F | 3.44 in. |
| February | 23.4 °F | 41.8 °F | 2.74 in. |
| March | 30.4 °F | 50.4 °F | 3.92 in. |
| April | 40.7 °F | 62.8 °F | 3.95 in. |
| May | 50.6 °F | 72.4 °F | 4.39 in. |
| June | 59.7 °F | 81.1 °F | 4.04 in. |
| July | 64.2 °F | 85.9 °F | 3.86 in. |
| August | 62.4 °F | 83.9 °F | 3.83 in. |
| September | 55.3 °F | 77.1 °F | 4.79 in. |
| October | 43.8 °F | 65.3 °F | 3.98 in. |
| November | 33.9 °F | 53.8 °F | 3.25 in. |
| December | 26.7 °F | 42.9 °F | 3.62 in. |
| Annual | 42.8 °F | 63 °F | 45.81 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |