| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 33°F | 25°F | 2.2" |
| February | 17°F | 34°F | 25°F | 1.8" |
| March | 27°F | 47°F | 36°F | 2.2" |
| April | 37°F | 61°F | 48°F | 3.3" |
| May | 47°F | 72°F | 59°F | 3.8" |
| June | 57°F | 80°F | 69°F | 4.0" |
| July | 60°F | 83°F | 72°F | 3.7" |
| August | 59°F | 81°F | 70°F | 4.2" |
| September | 52°F | 75°F | 63°F | 3.0" |
| October | 42°F | 63°F | 52°F | 3.1" |
| November | 32°F | 50°F | 40°F | 2.3" |
| December | 23°F | 37°F | 30°F | 2.0" |
| Index | Hillsdale | Michigan | National |
| Air quality index | 39 | 69 | 42 |
| Pollution index | 1,824,600 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 358 |
| Days with good air quality | 286 |
| Days with moderate air quality | 72 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Quincy, MI | 1,422 | 38 | 24.0% |
| Litchfield, MI | 1,232 | 39 | 22.0% |
| Allen, MI | 277 | 39 | 22.0% |
| Montgomery, MI | 359 | 39 | 22.0% |
| Clear Lake, IN | 398 | 39 | 22.0% |
| Hillsdale, MI | 8,073 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Maplewood, MO | 8,073 | 54 | 8.0% |
| Pleasant Hills, PA | 8,072 | 56 | 12.0% |
| Trinidad, CO | 8,076 | 20 | 60.0% |
| Diamondhead, MS | 8,076 | 42 | 16.0% |
| Rigaud, QC | 8,069 | n/a | |
| Hillsdale, MI | 8,073 | 39 | 22.0% |
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