| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 38°F | 30°F | 2.8" |
| February | 23°F | 40°F | 31°F | 2.5" |
| March | 34°F | 54°F | 43°F | 4.4" |
| April | 43°F | 66°F | 54°F | 4.7" |
| May | 53°F | 75°F | 64°F | 4.4" |
| June | 61°F | 83°F | 72°F | 5.8" |
| July | 65°F | 85°F | 74°F | 4.0" |
| August | 63°F | 84°F | 74°F | 2.6" |
| September | 56°F | 78°F | 67°F | 3.6" |
| October | 45°F | 67°F | 55°F | 3.7" |
| November | 34°F | 54°F | 44°F | 3.1" |
| December | 28°F | 43°F | 35°F | 4.0" |
| Index | Gratis | Ohio | National |
| Air quality index | 47 | 40 | 42 |
| Pollution index | 7,300,490 | 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 | 0.520% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.240% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Eaton, OH | 8,154 | 6 | 88.0% |
| Lake Lakengren, OH | 3,437 | 6 | 88.0% |
| College Corner, OH | 276 | 6 | 88.0% |
| Somerville, OH | 304 | 6 | 88.0% |
| Darrtown, OH | 550 | 6 | 88.0% |
| Gratis, OH | 887 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Cammack Village, AR | 887 | 45 | 10.0% |
| Cedar Crest, NM | 887 | 53 | 6.0% |
| Otego, NY | 887 | 27 | 46.0% |
| Morgandale, OH | 887 | 42 | 16.0% |
| McMurrich/Monteith, ON | 887 | n/a | |
| Gratis, OH | 887 | 47 | 6.0% |
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