Lancaster, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.7 °F (low) to 63.2 °F (high). Annual precipitation averages 45.3 Inches. Lancaster 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 | 22.7 °F | 39.0 °F | 3.19 in. |
| February | 23.7 °F | 41.6 °F | 2.56 in. |
| March | 31.0 °F | 50.5 °F | 3.74 in. |
| April | 41.0 °F | 63.4 °F | 3.6 in. |
| May | 51.3 °F | 72.8 °F | 3.81 in. |
| June | 60.9 °F | 81.4 °F | 4.3 in. |
| July | 65.4 °F | 85.6 °F | 4.35 in. |
| August | 63.7 °F | 83.9 °F | 3.86 in. |
| September | 56.6 °F | 77.3 °F | 4.76 in. |
| October | 45.0 °F | 65.6 °F | 4.34 in. |
| November | 34.9 °F | 54.1 °F | 3.16 in. |
| December | 27.6 °F | 43.5 °F | 3.59 in. |
| Annual | 43.7 °F | 63.2 °F | 45.26 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 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |