| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 33°F | 25°F | 2.0" |
| February | 18°F | 34°F | 26°F | 1.2" |
| March | 27°F | 47°F | 37°F | 2.0" |
| April | 38°F | 61°F | 49°F | 3.1" |
| May | 49°F | 72°F | 60°F | 3.6" |
| June | 59°F | 81°F | 70°F | 3.9" |
| July | 62°F | 84°F | 73°F | 4.7" |
| August | 61°F | 82°F | 71°F | 3.4" |
| September | 54°F | 75°F | 64°F | 3.4" |
| October | 43°F | 63°F | 52°F | 3.9" |
| November | 32°F | 50°F | 41°F | 2.2" |
| December | 23°F | 37°F | 30°F | 1.6" |
| Index | Athens | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 1,872,410 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 312 |
| Days with moderate air quality | 50 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Tekonsha, MI | 628 | 38 | 24.0% |
| Centreville, MI | 1,159 | 38 | 24.0% |
| Sherwood, MI | 507 | 38 | 24.0% |
| Climax, MI | 953 | 38 | 24.0% |
| Union City, MI | 1,731 | 38 | 24.0% |
| Athens, MI | 1,045 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Aspen Park, CO | 1,045 | 58 | 16.0% |
| St. Georges, DE | 1,045 | 42 | 16.0% |
| Deerfield, MI | 1,045 | 39 | 22.0% |
| Napanoch, NY | 1,045 | 36 | 28.0% |
| Matamoras, OH | 1,045 | 35 | 30.0% |
| Athens, MI | 1,045 | 38 | 24.0% |
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