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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 36°F | 29°F | 5.8" |
| February | 17°F | 32°F | 25°F | 2.4" |
| March | 28°F | 47°F | 36°F | 3.5" |
| April | 38°F | 58°F | 48°F | 6.9" |
| May | 47°F | 71°F | 59°F | 2.1" |
| June | 60°F | 83°F | 71°F | 4.1" |
| July | 61°F | 84°F | 72°F | 6.2" |
| August | 62°F | 83°F | 72°F | 13.1" |
| September | 55°F | 78°F | 66°F | 4.6" |
| October | 48°F | 66°F | 56°F | 4.3" |
| November | 33°F | 52°F | 43°F | 4.5" |
| December | 23°F | 36°F | 29°F | 3.6" |
| Index | Vermilion | Ohio | National |
| Air quality index | 50 | 40 | 42 |
| Pollution index | 9,912,140 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 185 |
| Days with moderate air quality | 173 |
| Days w/ poor A.Q. for sensitive groups | 7 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.120% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.440% |
| Mercury | 0.260% |
| City | Population | Air Quality Index | National Avg. |
| Collins, OH | 443 | 50 | = 100 |
| Berlin Heights, OH | 580 | 50 | = 100 |
| Huron, OH | 6,916 | 50 | = 100 |
| Milan, OH | 1,540 | 50 | = 100 |
| LaGrange, OH | 2,355 | 50 | = 100 |
| Vermilion, OH | 10,559 | 50 | = 100 |
| City | Population | Air Quality Index | National Avg. |
| Ogdensburg, NY | 10,559 | 35 | 30.0% |
| Atchison, KS | 10,561 | 43 | 14.0% |
| Gateway, FL | 10,552 | 36 | 28.0% |
| Marinette, WI | 10,566 | 36 | 28.0% |
| Monroe, WI | 10,573 | 38 | 24.0% |
| Vermilion, OH | 10,559 | 50 | = 100 |
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