| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 34°F | 26°F | 2.7" |
| February | 18°F | 34°F | 26°F | 2.1" |
| March | 25°F | 45°F | 35°F | 2.6" |
| April | 36°F | 59°F | 47°F | 3.7" |
| May | 46°F | 70°F | 58°F | 3.1" |
| June | 56°F | 79°F | 68°F | 3.8" |
| July | 60°F | 82°F | 72°F | 3.4" |
| August | 60°F | 81°F | 71°F | 3.0" |
| September | 53°F | 75°F | 64°F | 3.7" |
| October | 43°F | 62°F | 52°F | 4.4" |
| November | 33°F | 50°F | 42°F | 3.0" |
| December | 25°F | 38°F | 31°F | 2.8" |
| Index | Rothbury | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 2,391,480 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 262 |
| Days with good air quality | 236 |
| Days with moderate air quality | 25 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.110% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.030% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Shelby, MI | 2,567 | 38 | 24.0% |
| Twin Lake, MI | 1,764 | 38 | 24.0% |
| Walkerville, MI | 266 | 38 | 24.0% |
| Whitehall, MI | 2,789 | 38 | 24.0% |
| Hart, MI | 2,118 | 38 | 24.0% |
| Rothbury, MI | 402 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Montrose, AR | 402 | 43 | 14.0% |
| Danbury, IA | 402 | 35 | 30.0% |
| Trenton, KY | 402 | 40 | 20.0% |
| Osborn, MO | 402 | 43 | 14.0% |
| Purcell, MO | 402 | 37 | 26.0% |
| Rothbury, MI | 402 | 38 | 24.0% |
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