| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 26°F | 2.8" |
| February | 20°F | 36°F | 27°F | 2.4" |
| March | 31°F | 52°F | 40°F | 4.8" |
| April | 40°F | 63°F | 50°F | 3.3" |
| May | 49°F | 74°F | 60°F | 4.6" |
| June | 57°F | 81°F | 68°F | 5.5" |
| July | 61°F | 85°F | 72°F | 6.5" |
| August | 59°F | 83°F | 70°F | 4.0" |
| September | 53°F | 76°F | 63°F | 3.8" |
| October | 43°F | 63°F | 52°F | 3.5" |
| November | 33°F | 53°F | 42°F | 3.6" |
| December | 25°F | 40°F | 31°F | 3.3" |
| Index | Lake Tomahawk | Ohio | National |
| Air quality index | 6 | 40 | 42 |
| Pollution index | 2,559,460 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 354 |
| Days with good air quality | 353 |
| Days with moderate air quality | 1 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.005% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.060% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Glasgow, PA | 115 | 6 | 88.0% |
| Calcutta, OH | 4,306 | 6 | 88.0% |
| Patterson Heights, PA | 570 | 6 | 88.0% |
| La Croft, OH | 1,048 | 6 | 88.0% |
| Shippingport, PA | 199 | 6 | 88.0% |
| Lake Tomahawk, OH | 713 | 6 | 88.0% |
| City | Population | Air Quality Index | National Avg. |
| Caddo Valley, AR | 713 | 32 | 36.0% |
| Round Valley, AZ | 713 | 60 | 20.0% |
| Hanover, IL | 713 | 42 | 16.0% |
| Parkway Village, KY | 713 | 49 | 2.0% |
| North Brentwood, MD | 713 | 47 | 6.0% |
| Lake Tomahawk, OH | 713 | 6 | 88.0% |
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