| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 32°F | 25°F | 3.5" |
| February | 16°F | 32°F | 24°F | 2.2" |
| March | 26°F | 43°F | 33°F | 2.2" |
| April | 36°F | 57°F | 45°F | 2.8" |
| May | 46°F | 69°F | 57°F | 3.2" |
| June | 56°F | 77°F | 66°F | 3.6" |
| July | 61°F | 81°F | 71°F | 4.0" |
| August | 60°F | 80°F | 69°F | 3.3" |
| September | 53°F | 74°F | 63°F | 3.1" |
| October | 43°F | 62°F | 52°F | 2.5" |
| November | 33°F | 49°F | 41°F | 2.9" |
| December | 24°F | 37°F | 30°F | 3.0" |
| Index | Croswell | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 30,180,300 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 340 |
| Days with good air quality | 282 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| Port Sanilac, MI | 654 | 38 | 24.0% |
| Lexington, MI | 1,180 | 38 | 24.0% |
| Sandusky, MI | 2,796 | 38 | 24.0% |
| Peck, MI | 617 | 38 | 24.0% |
| Yale, MI | 2,216 | 38 | 24.0% |
| Croswell, MI | 2,402 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Caryville, TN | 2,402 | 46 | 8.0% |
| Boissevain-Morton, MB | 2,402 | n/a | |
| Rouses Point, NY | 2,403 | 37 | 26.0% |
| Dover, AR | 2,400 | 36 | 28.0% |
| Fort Polk North, LA | 2,400 | 30 | 40.0% |
| Croswell, MI | 2,402 | 38 | 24.0% |
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