| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 38°F | 28°F | 3.4" |
| February | 20°F | 40°F | 30°F | 2.3" |
| March | 31°F | 53°F | 41°F | 4.0" |
| April | 41°F | 67°F | 53°F | 4.5" |
| May | 51°F | 75°F | 63°F | 4.1" |
| June | 61°F | 84°F | 72°F | 4.5" |
| July | 63°F | 85°F | 74°F | 4.3" |
| August | 62°F | 85°F | 73°F | 2.9" |
| September | 55°F | 79°F | 67°F | 4.3" |
| October | 44°F | 67°F | 55°F | 3.5" |
| November | 33°F | 55°F | 43°F | 3.1" |
| December | 25°F | 42°F | 33°F | 3.9" |
| Index | Gettysburg | Ohio | National |
| Air quality index | 47 | 40 | 42 |
| Pollution index | 11,539,300 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 213 |
| Days with moderate air quality | 152 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.210% |
| Benzene | 0.110% |
| Carbon Tetrachloride | 0.060% |
| Lead | 0.110% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Castine, OH | 138 | 6 | 88.0% |
| Palestine, OH | 252 | 6 | 88.0% |
| Eldorado, OH | 598 | 6 | 88.0% |
| Wayne Lakes, OH | 834 | 6 | 88.0% |
| Greenville, OH | 12,743 | 6 | 88.0% |
| Gettysburg, OH | 653 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Somerville, AL | 653 | 41 | 18.0% |
| Bradford, AR | 653 | 45 | 10.0% |
| Cattle Creek, CO | 653 | 44 | 12.0% |
| Holiday Hills, IL | 653 | 39 | 22.0% |
| Cynthiana, IN | 653 | 45 | 10.0% |
| Gettysburg, OH | 653 | 47 | 6.0% |
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