| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 35°F | 27°F | 2.3" |
| February | 20°F | 37°F | 28°F | 2.0" |
| March | 30°F | 50°F | 39°F | 2.5" |
| April | 40°F | 64°F | 51°F | 3.7" |
| May | 51°F | 74°F | 62°F | 3.7" |
| June | 61°F | 83°F | 71°F | 4.6" |
| July | 63°F | 85°F | 74°F | 4.0" |
| August | 61°F | 84°F | 72°F | 3.5" |
| September | 55°F | 78°F | 66°F | 2.9" |
| October | 44°F | 66°F | 54°F | 2.6" |
| November | 33°F | 53°F | 43°F | 2.5" |
| December | 25°F | 40°F | 32°F | 2.7" |
| Index | Findlay | Ohio | National |
| Air quality index | 39 | 40 | 42 |
| Pollution index | 2,539,140 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 303 |
| Days with moderate air quality | 61 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Gilboa, OH | 216 | 39 | 22.0% |
| Jenera, OH | 255 | 39 | 22.0% |
| Vanlue, OH | 390 | 39 | 22.0% |
| Arlington, OH | 1,558 | 39 | 22.0% |
| Mount Blanchard, OH | 508 | 39 | 22.0% |
| Findlay, OH | 41,098 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Weslaco, TX | 41,103 | 42 | 16.0% |
| Hickory, NC | 41,067 | 43 | 14.0% |
| Oviedo, FL | 41,062 | 37 | 26.0% |
| Manassas, VA | 41,038 | 47 | 6.0% |
| Shelton, CT | 41,162 | 41 | 18.0% |
| Findlay, OH | 41,098 | 39 | 22.0% |
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