| 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 | Bucyrus | Ohio | National |
| Air quality index | 41 | 40 | 42 |
| Pollution index | 1,197,810 | 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 | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| McCutchenville, OH | 211 | 39 | 22.0% |
| Harpster, OH | 254 | 39 | 22.0% |
| Sycamore, OH | 740 | 39 | 22.0% |
| Tiro, OH | 219 | 41 | 18.0% |
| Galion, OH | 10,003 | 41 | 18.0% |
| Bucyrus, OH | 11,808 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Martinsville, IN | 11,807 | 42 | 16.0% |
| Robinson, TX | 11,806 | 38 | 24.0% |
| Dunkirk, NY | 11,812 | 37 | 26.0% |
| Manchester, VA | 11,814 | 44 | 12.0% |
| Alum Rock, CA | 11,798 | 43 | 14.0% |
| Bucyrus, OH | 11,808 | 41 | 18.0% |
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