| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 35°F | 27°F | 2.0" |
| February | 19°F | 36°F | 27°F | 1.9" |
| March | 30°F | 50°F | 39°F | 2.7" |
| April | 39°F | 63°F | 51°F | 3.8" |
| May | 50°F | 74°F | 62°F | 3.9" |
| June | 59°F | 83°F | 71°F | 4.0" |
| July | 62°F | 85°F | 74°F | 3.3" |
| August | 60°F | 84°F | 72°F | 3.6" |
| September | 54°F | 78°F | 65°F | 3.2" |
| October | 44°F | 65°F | 53°F | 2.6" |
| November | 33°F | 52°F | 42°F | 2.8" |
| December | 25°F | 39°F | 32°F | 2.4" |
| Index | Haviland | Ohio | National |
| Air quality index | 45 | 40 | 42 |
| Pollution index | 911,093 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 236 |
| Days with moderate air quality | 128 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Cloverdale, OH | 167 | 39 | 22.0% |
| Van Wert, OH | 10,531 | 39 | 22.0% |
| Melrose, OH | 358 | 39 | 22.0% |
| Grover Hill, OH | 417 | 39 | 22.0% |
| Dupont, OH | 405 | 39 | 22.0% |
| Haviland, OH | 258 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Gordon, AL | 258 | 35 | 30.0% |
| Weogufka, AL | 258 | 38 | 24.0% |
| St. Francis, AR | 258 | 26 | 48.0% |
| Ambrose, GA | 258 | 26 | 48.0% |
| Maalaea, HI | 258 | 15 | 70.0% |
| Haviland, OH | 258 | 45 | 10.0% |
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