| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 30°F | 21°F | 2.0" |
| February | 11°F | 31°F | 21°F | 1.4" |
| March | 18°F | 41°F | 29°F | 1.8" |
| April | 30°F | 55°F | 42°F | 3.5" |
| May | 40°F | 69°F | 54°F | 2.8" |
| June | 50°F | 78°F | 64°F | 3.7" |
| July | 55°F | 83°F | 69°F | 3.3" |
| August | 54°F | 81°F | 67°F | 3.5" |
| September | 47°F | 74°F | 60°F | 3.2" |
| October | 38°F | 60°F | 48°F | 3.4" |
| November | 28°F | 47°F | 37°F | 2.0" |
| December | 18°F | 34°F | 26°F | 2.1" |
| Index | Posen | Michigan | National |
| Air quality index | 32 | 69 | 42 |
| Pollution index | 2,801,040 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 58 |
| Days with good air quality | 53 |
| Days with moderate air quality | 5 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.050% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.030% |
| Mercury | 0.220% |
| City | Population | Air Quality Index | National Avg. |
| Alpena, MI | 9,987 | 26 | 48.0% |
| Presque Isle Harbor, MI | 704 | 32 | 36.0% |
| Rogers City, MI | 2,669 | 32 | 36.0% |
| Hillman, MI | 593 | 36 | 28.0% |
| Posen, MI | 205 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| College City, CA | 205 | 44 | 12.0% |
| Castana, IA | 205 | 35 | 30.0% |
| Coulter, IA | 205 | 15 | 70.0% |
| Sherrill, IA | 205 | 29 | 42.0% |
| Onaway, ID | 205 | 10 | 80.0% |
| Posen, MI | 205 | 32 | 36.0% |
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