| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 27°F | 4.5" |
| February | 20°F | 35°F | 27°F | 3.8" |
| March | 30°F | 47°F | 37°F | 5.3" |
| April | 40°F | 60°F | 49°F | 3.0" |
| May | 51°F | 71°F | 61°F | 5.1" |
| June | 60°F | 80°F | 70°F | 5.5" |
| July | 63°F | 84°F | 73°F | 5.5" |
| August | 61°F | 81°F | 71°F | 6.2" |
| September | 55°F | 75°F | 64°F | 5.9" |
| October | 44°F | 64°F | 53°F | 3.6" |
| November | 34°F | 51°F | 42°F | 5.4" |
| December | 26°F | 39°F | 32°F | 2.9" |
| Index | Temperance | Michigan | National |
| Air quality index | 40 | 69 | 42 |
| Pollution index | 13,229,000 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 291 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.150% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.070% |
| Mercury | 0.220% |
| City | Population | Air Quality Index | National Avg. |
| South Monroe, MI | 6,194 | 1 | 98.0% |
| Dundee, MI | 4,405 | 1 | 98.0% |
| Luna Pier, MI | 1,134 | 1 | 98.0% |
| West Monroe, MI | 3,261 | 1 | 98.0% |
| Monroe, MI | 19,543 | 1 | 98.0% |
| Temperance, MI | 8,961 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Garden City, GA | 8,957 | 39 | 22.0% |
| Picture Rocks, AZ | 8,955 | 47 | 6.0% |
| University of Virginia, VA | 8,955 | 40 | 20.0% |
| Pine Lake Park, NJ | 8,954 | 41 | 18.0% |
| Willow Street, PA | 8,953 | 45 | 10.0% |
| Temperance, MI | 8,961 | 40 | 20.0% |
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