| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 33°F | 26°F | 3.3" |
| February | 18°F | 33°F | 25°F | 2.9" |
| March | 27°F | 45°F | 35°F | 4.4" |
| April | 37°F | 58°F | 47°F | 5.0" |
| May | 48°F | 70°F | 59°F | 6.0" |
| June | 58°F | 79°F | 68°F | 5.5" |
| July | 62°F | 83°F | 73°F | 7.1" |
| August | 61°F | 81°F | 71°F | 7.3" |
| September | 54°F | 74°F | 64°F | 6.6" |
| October | 44°F | 62°F | 53°F | 4.9" |
| November | 33°F | 49°F | 41°F | 4.2" |
| December | 25°F | 37°F | 31°F | 3.8" |
| Index | Romeo | Michigan | National |
| Air quality index | 56 | 69 | 42 |
| Pollution index | 30,180,300 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 135 |
| Days with moderate air quality | 217 |
| Days w/ poor A.Q. for sensitive groups | 13 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.390% |
| Carbon Tetrachloride | 0.080% |
| Lead | 0.130% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Dryden, MI | 1,368 | 38 | 24.0% |
| Metamora, MI | 680 | 38 | 24.0% |
| Almont, MI | 2,891 | 38 | 24.0% |
| Oxford, MI | 3,621 | 38 | 24.0% |
| Imlay City, MI | 3,711 | 38 | 24.0% |
| Romeo, MI | 4,011 | 56 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Moosup, CT | 4,011 | 37 | 26.0% |
| Hunter, OH | 4,010 | 47 | 6.0% |
| West Columbia, TX | 4,010 | 52 | 4.0% |
| Oracle, AZ | 4,012 | 47 | 6.0% |
| Ridgeland, SC | 4,013 | 29 | 42.0% |
| Romeo, MI | 4,011 | 56 | 12.0% |
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