| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 35°F | 26°F | 3.0" |
| February | 17°F | 36°F | 27°F | 2.5" |
| March | 27°F | 49°F | 37°F | 2.9" |
| April | 38°F | 64°F | 50°F | 3.7" |
| May | 48°F | 75°F | 61°F | 3.6" |
| June | 58°F | 84°F | 70°F | 4.2" |
| July | 61°F | 86°F | 73°F | 4.5" |
| August | 60°F | 84°F | 71°F | 3.8" |
| September | 53°F | 78°F | 65°F | 3.4" |
| October | 42°F | 66°F | 53°F | 2.6" |
| November | 32°F | 52°F | 41°F | 3.0" |
| December | 23°F | 39°F | 31°F | 2.9" |
| Index | Waterville | Ohio | National |
| Air quality index | 40 | 40 | 42 |
| Pollution index | 14,137,800 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 291 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.600% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.500% |
| Mercury | 0.620% |
| City | Population | Air Quality Index | National Avg. |
| Delta, OH | 2,838 | 39 | 22.0% |
| Metamora, OH | 638 | 39 | 22.0% |
| Sylvania, OH | 19,242 | 40 | 20.0% |
| Whitehouse, OH | 4,624 | 40 | 20.0% |
| Northwood, OH | 5,420 | 40 | 20.0% |
| Waterville, OH | 5,519 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Ulysses, KS | 5,518 | 15 | 70.0% |
| Caruthersville, MO | 5,518 | 26 | 48.0% |
| Connell, WA | 5,518 | 37 | 26.0% |
| Waterford, WI | 5,520 | 39 | 22.0% |
| Hooksett, NH | 5,517 | 37 | 26.0% |
| Waterville, OH | 5,519 | 40 | 20.0% |
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