| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 35°F | 26°F | 3.0" |
| February | 17°F | 36°F | 27°F | 2.5" |
| March | 27°F | 49°F | 37°F | 2.9" |
| April | 38°F | 64°F | 50°F | 3.7" |
| May | 48°F | 75°F | 61°F | 3.6" |
| June | 58°F | 84°F | 70°F | 4.2" |
| July | 61°F | 86°F | 73°F | 4.5" |
| August | 60°F | 84°F | 71°F | 3.8" |
| September | 53°F | 78°F | 65°F | 3.4" |
| October | 42°F | 66°F | 53°F | 2.6" |
| November | 32°F | 52°F | 41°F | 3.0" |
| December | 23°F | 39°F | 31°F | 2.9" |
| Index | Delta | Ohio | National |
| Air quality index | 39 | 40 | 42 |
| Pollution index | 2,339,740 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 358 |
| Days with good air quality | 286 |
| Days with moderate air quality | 72 |
| 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 | 0.002% |
| Lead | 0.020% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Lyons, OH | 658 | 39 | 22.0% |
| Wauseon, OH | 7,229 | 39 | 22.0% |
| Jasper, MI | 344 | 39 | 22.0% |
| Metamora, OH | 638 | 39 | 22.0% |
| Morenci, MI | 1,932 | 39 | 22.0% |
| Delta, OH | 2,838 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Weimar, TX | 2,838 | 31 | 38.0% |
| Forestville, QC | 2,838 | n/a | |
| Lake Wilderness, VA | 2,837 | 40 | 20.0% |
| Baiting Hollow, NY | 2,839 | 41 | 18.0% |
| Buckeye Lake, OH | 2,839 | 46 | 8.0% |
| Delta, OH | 2,838 | 39 | 22.0% |
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