| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 31°F | 25°F | 2.5" |
| February | 17°F | 31°F | 24°F | 1.9" |
| March | 24°F | 42°F | 33°F | 3.0" |
| April | 34°F | 55°F | 44°F | 5.6" |
| May | 44°F | 67°F | 55°F | 5.6" |
| June | 52°F | 74°F | 63°F | 6.3" |
| July | 57°F | 79°F | 68°F | 5.3" |
| August | 56°F | 77°F | 67°F | 5.4" |
| September | 50°F | 71°F | 60°F | 5.5" |
| October | 40°F | 59°F | 49°F | 6.3" |
| November | 32°F | 47°F | 39°F | 3.4" |
| December | 23°F | 34°F | 29°F | 2.8" |
| Index | Harrietta | Michigan | National |
| Air quality index | 36 | 69 | 42 |
| Pollution index | 1,468,630 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 330 |
| Days with moderate air quality | 35 |
| 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 | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hardwood Acres, MI | 730 | 36 | 28.0% |
| Tustin, MI | 199 | 36 | 28.0% |
| Crystal Mountain, MI | 60 | 36 | 28.0% |
| Wellston, MI | 272 | 36 | 28.0% |
| Haring, MI | 372 | 36 | 28.0% |
| Harrietta, MI | 228 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Newtok, AK | 228 | 31 | 38.0% |
| Tillar, AR | 228 | 43 | 14.0% |
| Elbert, CO | 228 | 45 | 10.0% |
| Mineola, IA | 228 | 40 | 20.0% |
| Wadena, IA | 228 | 39 | 22.0% |
| Harrietta, MI | 228 | 36 | 28.0% |
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