| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 39°F | 30°F | 2.9" |
| February | 22°F | 41°F | 31°F | 2.2" |
| March | 31°F | 54°F | 42°F | 3.5" |
| April | 41°F | 67°F | 53°F | 4.1" |
| May | 50°F | 75°F | 62°F | 3.5" |
| June | 59°F | 82°F | 70°F | 5.1" |
| July | 63°F | 85°F | 73°F | 4.0" |
| August | 61°F | 84°F | 72°F | 3.1" |
| September | 54°F | 78°F | 66°F | 2.8" |
| October | 43°F | 66°F | 54°F | 3.5" |
| November | 33°F | 55°F | 43°F | 2.8" |
| December | 27°F | 43°F | 35°F | 3.4" |
| Index | Nellie | Ohio | National |
| Air quality index | 41 | 40 | 42 |
| Pollution index | 1,256,000 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 245 |
| Days with good air quality | 218 |
| Days with moderate air quality | 27 |
| 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 | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Glenmont, OH | 273 | 41 | 18.0% |
| Coshocton, OH | 10,993 | 41 | 18.0% |
| Bladensburg, OH | 353 | 41 | 18.0% |
| Conesville, OH | 289 | 41 | 18.0% |
| Killbuck, OH | 870 | 41 | 18.0% |
| Nellie, OH | 253 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| McIntosh, AL | 253 | 42 | 16.0% |
| Lava Hot Springs, ID | 253 | 27 | 46.0% |
| Spring Lake, IN | 253 | 54 | 8.0% |
| Westport, KY | 253 | 49 | 2.0% |
| Jennings, MI | 253 | 36 | 28.0% |
| Nellie, OH | 253 | 41 | 18.0% |
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