Gettysburg, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.5 °F (low) to 61 °F (high). Annual precipitation averages 40.2 Inches. Gettysburg is located in USDA Plant Hardiness Zone 6a. 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 | 18.8 °F | 34.3 °F | 2.76 in. |
| February | 21.2 °F | 38.2 °F | 2.25 in. |
| March | 29.5 °F | 48.5 °F | 3.06 in. |
| April | 39.9 °F | 61.4 °F | 3.99 in. |
| May | 51.2 °F | 71.9 °F | 4.34 in. |
| June | 60.5 °F | 80.3 °F | 4.42 in. |
| July | 63.2 °F | 83.2 °F | 4.33 in. |
| August | 61.1 °F | 82.3 °F | 3.31 in. |
| September | 53.5 °F | 77.1 °F | 3.07 in. |
| October | 42.5 °F | 64.6 °F | 2.78 in. |
| November | 32.5 °F | 50.6 °F | 2.94 in. |
| December | 24.5 °F | 39.1 °F | 2.91 in. |
| Annual | 41.5 °F | 61 °F | 40.16 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |