| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 33°F | 26°F | 2.3" |
| February | 18°F | 34°F | 26°F | 2.5" |
| March | 27°F | 45°F | 35°F | 3.3" |
| April | 37°F | 58°F | 47°F | 4.0" |
| May | 48°F | 70°F | 59°F | 3.2" |
| June | 59°F | 79°F | 69°F | 3.4" |
| July | 63°F | 82°F | 73°F | 3.9" |
| August | 61°F | 81°F | 71°F | 3.5" |
| September | 55°F | 75°F | 64°F | 3.2" |
| October | 45°F | 63°F | 53°F | 2.5" |
| November | 34°F | 49°F | 41°F | 2.8" |
| December | 24°F | 37°F | 30°F | 2.9" |
| Index | Kelleys Island | Ohio | National |
| Air quality index | 1 | 40 | 42 |
| Pollution index | 2,402,580 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 355 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.020% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Put-in-Bay, OH | 56 | 1 | 98.0% |
| Lakeside, OH | 686 | 1 | 98.0% |
| Marblehead, OH | 858 | 1 | 98.0% |
| Sandusky, OH | 24,651 | 1 | 98.0% |
| Crystal Rock, OH | 164 | 40 | 20.0% |
| Kelleys Island, OH | 283 | 1 | 98.0% |
| City | Population | Air Quality Index | National Avg. |
| El Nido, CA | 283 | 48 | 4.0% |
| Buncombe, IL | 283 | 44 | 12.0% |
| Sparta, KY | 283 | 54 | 8.0% |
| Ryegate, MT | 283 | 21 | 58.0% |
| Dover, NC | 283 | 42 | 16.0% |
| Kelleys Island, OH | 283 | 1 | 98.0% |
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