| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 31°F | 24°F | 3.1" |
| February | 16°F | 31°F | 24°F | 3.1" |
| March | 26°F | 44°F | 34°F | 3.6" |
| April | 35°F | 58°F | 46°F | 5.0" |
| May | 46°F | 71°F | 58°F | 5.0" |
| June | 55°F | 78°F | 66°F | 8.8" |
| July | 59°F | 82°F | 71°F | 5.0" |
| August | 58°F | 80°F | 69°F | 6.1" |
| September | 51°F | 73°F | 61°F | 5.6" |
| October | 41°F | 61°F | 50°F | 6.2" |
| November | 32°F | 48°F | 39°F | 3.5" |
| December | 23°F | 35°F | 29°F | 2.7" |
| Index | Shepherd | Michigan | National |
| Air quality index | 26 | 69 | 42 |
| Pollution index | 1,927,350 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 316 |
| Days with good air quality | 288 |
| Days with moderate air quality | 28 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Rosebush, MI | 428 | 26 | 48.0% |
| St. Louis, MI | 7,156 | 26 | 48.0% |
| Alma, MI | 8,918 | 26 | 48.0% |
| Mount Pleasant, MI | 25,290 | 26 | 48.0% |
| Breckenridge, MI | 1,428 | 26 | 48.0% |
| Shepherd, MI | 1,380 | 26 | 48.0% |
| City | Population | Air Quality Index | National Avg. |
| Robie Creek, ID | 1,380 | 36 | 28.0% |
| Greenville, IN | 1,380 | 49 | 2.0% |
| Ellington, MO | 1,380 | 54 | 8.0% |
| Monticello, MS | 1,380 | 35 | 30.0% |
| Castle Dale, UT | 1,380 | 46 | 8.0% |
| Shepherd, MI | 1,380 | 26 | 48.0% |
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