| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 5°F | 23°F | 14°F | 1.6" |
| February | 4°F | 25°F | 15°F | 1.2" |
| March | 16°F | 39°F | 27°F | 1.4" |
| April | 28°F | 52°F | 39°F | 2.9" |
| May | 40°F | 66°F | 52°F | 3.9" |
| June | 49°F | 74°F | 61°F | 3.3" |
| July | 52°F | 79°F | 66°F | 3.3" |
| August | 51°F | 76°F | 63°F | 4.5" |
| September | 44°F | 68°F | 55°F | 4.1" |
| October | 35°F | 54°F | 44°F | 4.1" |
| November | 24°F | 40°F | 32°F | 2.1" |
| December | 11°F | 26°F | 19°F | 1.8" |
| Index | Caspian | Michigan | National |
| Air quality index | 8 | 69 | 42 |
| Pollution index | 1,717,800 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 59 |
| Days with good air quality | 59 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Gaastra, MI | 330 | 8 | 84.0% |
| Alpha, MI | 192 | 8 | 84.0% |
| Amasa, MI | 242 | 8 | 84.0% |
| Iron River, MI | 2,831 | 8 | 84.0% |
| Crystal Falls, MI | 1,626 | 8 | 84.0% |
| Caspian, MI | 491 | 8 | 84.0% |
| City | Population | Air Quality Index | National Avg. |
| Wheatfields, AZ | 491 | 60 | 20.0% |
| Walsh, CO | 491 | 15 | 70.0% |
| Roopville, GA | 491 | 52 | 4.0% |
| Delmar, IA | 491 | 42 | 16.0% |
| Shuqualak, MS | 491 | 36 | 28.0% |
| Caspian, MI | 491 | 8 | 84.0% |
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