Schaefferstown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.6 °F (low) to 62.5 °F (high). Annual precipitation averages 47.8 Inches. Schaefferstown is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.6 °F | 37.9 °F | 3.34 in. |
| February | 22.4 °F | 40.9 °F | 2.66 in. |
| March | 29.9 °F | 49.7 °F | 4.06 in. |
| April | 40.4 °F | 62.7 °F | 3.92 in. |
| May | 50.3 °F | 72.4 °F | 3.86 in. |
| June | 59.8 °F | 80.5 °F | 4.75 in. |
| July | 64.0 °F | 85.3 °F | 4.53 in. |
| August | 62.4 °F | 83.4 °F | 4.21 in. |
| September | 55.6 °F | 76.5 °F | 4.81 in. |
| October | 44.4 °F | 64.9 °F | 4.38 in. |
| November | 33.9 °F | 53.5 °F | 3.34 in. |
| December | 26.5 °F | 42.5 °F | 3.97 in. |
| Annual | 42.6 °F | 62.5 °F | 47.83 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |