Gettysburg, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.9 °F (low) to 63.4 °F (high). Annual precipitation averages 45 Inches. Gettysburg 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 | 22.2 °F | 39.2 °F | 3.29 in. |
| February | 23.6 °F | 42.3 °F | 2.68 in. |
| March | 30.5 °F | 50.9 °F | 3.82 in. |
| April | 40.8 °F | 63.2 °F | 3.61 in. |
| May | 50.6 °F | 72.8 °F | 4.19 in. |
| June | 59.9 °F | 81.4 °F | 4.14 in. |
| July | 64.3 °F | 86.2 °F | 3.94 in. |
| August | 62.4 °F | 84.2 °F | 3.81 in. |
| September | 55.4 °F | 77.5 °F | 4.96 in. |
| October | 43.7 °F | 65.6 °F | 3.88 in. |
| November | 34.0 °F | 54.3 °F | 3.17 in. |
| December | 27.0 °F | 43.4 °F | 3.49 in. |
| Annual | 42.9 °F | 63.4 °F | 44.98 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 |