| 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 | Monroe | Michigan | National |
| Air quality index | 1 | 69 | 42 |
| Pollution index | 1,741,370 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 355 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Flat Rock, MI | 9,974 | 1 | 98.0% |
| Dundee, MI | 4,405 | 1 | 98.0% |
| Stony Point, MI | 1,624 | 1 | 98.0% |
| Gibraltar, MI | 4,546 | 1 | 98.0% |
| Estral Beach, MI | 367 | 1 | 98.0% |
| Monroe, MI | 19,543 | 1 | 98.0% |
| City | Population | Air Quality Index | National Avg. |
| El Reno, OK | 19,539 | 48 | 4.0% |
| Upper St. Clair, PA | 19,521 | 56 | 12.0% |
| Makakilo, HI | 19,565 | 30 | 40.0% |
| Montgomery, IL | 19,515 | 0 | 100.0% |
| Salmon Creek, WA | 19,506 | 38 | 24.0% |
| Monroe, MI | 19,543 | 1 | 98.0% |
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