| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 26°F | 18°F | 1.2" |
| February | 14°F | 29°F | 21°F | 2.6" |
| March | 28°F | 44°F | 35°F | 3.4" |
| April | 40°F | 59°F | 48°F | 4.7" |
| May | 51°F | 72°F | 60°F | 7.4" |
| June | 61°F | 80°F | 70°F | 7.3" |
| July | 66°F | 85°F | 75°F | 8.1" |
| August | 63°F | 81°F | 72°F | 9.2" |
| September | 56°F | 75°F | 64°F | 6.3" |
| October | 43°F | 60°F | 50°F | 7.3" |
| November | 30°F | 45°F | 37°F | 2.2" |
| December | 17°F | 29°F | 22°F | 3.4" |
| Index | Afton | Minnesota | National |
| Air quality index | 46 | 35 | 42 |
| Pollution index | 5,242,890 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 214 |
| Days with moderate air quality | 148 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.070% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Hastings, MN | 22,796 | 37 | 26.0% |
| River Falls, WI | 15,870 | 37 | 26.0% |
| St. Marys Point, MN | 440 | 37 | 26.0% |
| Roberts, WI | 1,849 | 37 | 26.0% |
| Prescott, WI | 4,278 | 37 | 26.0% |
| Afton, MN | 3,008 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Moundville, AL | 3,008 | 35 | 30.0% |
| Montgomery, MN | 3,008 | 46 | 8.0% |
| Gloverville, SC | 3,008 | 47 | 6.0% |
| Beechwood, MS | 3,007 | 44 | 12.0% |
| Santa Rosa, NM | 3,007 | 44 | 12.0% |
| Afton, MN | 3,008 | 46 | 8.0% |
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