| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 38°F | 29°F | 2.4" |
| February | 21°F | 39°F | 30°F | 2.2" |
| March | 31°F | 53°F | 41°F | 3.6" |
| April | 40°F | 66°F | 53°F | 3.8" |
| May | 51°F | 75°F | 62°F | 3.4" |
| June | 59°F | 82°F | 70°F | 5.5" |
| July | 62°F | 84°F | 73°F | 4.5" |
| August | 60°F | 83°F | 71°F | 3.6" |
| September | 54°F | 78°F | 64°F | 3.0" |
| October | 43°F | 66°F | 54°F | 3.9" |
| November | 33°F | 54°F | 43°F | 2.7" |
| December | 27°F | 43°F | 34°F | 3.3" |
| Index | Dundee | Ohio | National |
| Air quality index | 46 | 40 | 42 |
| Pollution index | 1,256,000 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 226 |
| Days with moderate air quality | 139 |
| 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. |
| Stone Creek, OH | 159 | 46 | 8.0% |
| Dennison, OH | 2,521 | 46 | 8.0% |
| New Philadelphia, OH | 17,485 | 46 | 8.0% |
| Apple Creek, OH | 1,085 | 46 | 8.0% |
| Fredericksburg, OH | 467 | 46 | 8.0% |
| Dundee, OH | 654 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Dongola, IL | 654 | 44 | 12.0% |
| Homecroft, IN | 654 | 54 | 8.0% |
| Hayes, LA | 654 | 45 | 10.0% |
| Port Sanilac, MI | 654 | 38 | 24.0% |
| Unionville, MI | 654 | 26 | 48.0% |
| Dundee, OH | 654 | 46 | 8.0% |
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