| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 24°F | 16°F | 1.2" |
| February | 11°F | 28°F | 18°F | 2.3" |
| March | 27°F | 44°F | 34°F | 2.2" |
| April | 39°F | 59°F | 47°F | 2.9" |
| May | 50°F | 71°F | 59°F | 4.0" |
| June | 60°F | 80°F | 69°F | 5.5" |
| July | 64°F | 83°F | 73°F | 6.8" |
| August | 61°F | 80°F | 70°F | 6.7" |
| September | 53°F | 74°F | 63°F | 4.4" |
| October | 41°F | 60°F | 49°F | 3.0" |
| November | 28°F | 45°F | 36°F | 2.0" |
| December | 13°F | 28°F | 20°F | 1.4" |
| Index | Wells | Minnesota | National |
| Air quality index | 15 | 35 | 42 |
| Pollution index | 804,204 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 118 |
| Days with good air quality | 118 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Mapleton, MN | 1,606 | 15 | 70.0% |
| Freeborn, MN | 319 | 15 | 70.0% |
| Minnesota Lake, MN | 575 | 15 | 70.0% |
| Delavan, MN | 206 | 15 | 70.0% |
| Alden, MN | 708 | 15 | 70.0% |
| Wells, MN | 2,367 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| Holcomb, KS | 2,367 | 15 | 70.0% |
| Huntingdon, QC | 2,367 | n/a | |
| Sleepy Hollow, CA | 2,366 | 40 | 20.0% |
| Penngrove, CA | 2,368 | 34 | 32.0% |
| Grissom AFB, IN | 2,368 | 37 | 26.0% |
| Wells, MN | 2,367 | 15 | 70.0% |
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