| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 37°F | 30°F | 7.1" |
| February | 17°F | 33°F | 25°F | 2.5" |
| March | 29°F | 49°F | 39°F | 4.5" |
| April | 38°F | 62°F | 50°F | 5.9" |
| May | 48°F | 74°F | 60°F | 3.3" |
| June | 60°F | 84°F | 72°F | 4.3" |
| July | 62°F | 85°F | 73°F | 5.0" |
| August | 63°F | 84°F | 73°F | 7.2" |
| September | 55°F | 79°F | 66°F | 6.6" |
| October | 47°F | 67°F | 56°F | 4.9" |
| November | 32°F | 52°F | 42°F | 5.1" |
| December | 22°F | 36°F | 29°F | 3.4" |
| Index | Bloomville | Ohio | National |
| Air quality index | 40 | 40 | 42 |
| Pollution index | 2,402,580 | 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 | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.020% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| McCutchenville, OH | 211 | 39 | 22.0% |
| Sycamore, OH | 740 | 39 | 22.0% |
| Flat Rock, OH | 261 | 40 | 20.0% |
| Tiffin, OH | 17,473 | 40 | 20.0% |
| Old Fort, OH | 218 | 40 | 20.0% |
| Bloomville, OH | 1,004 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Midway, AR | 1,004 | 36 | 28.0% |
| Stover, MO | 1,004 | 39 | 22.0% |
| Loup City, NE | 1,004 | 19 | 62.0% |
| Harbor Isle, NY | 1,004 | 51 | 2.0% |
| Hopedale, OH | 1,004 | 46 | 8.0% |
| Bloomville, OH | 1,004 | 40 | 20.0% |
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