| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 27°F | 19°F | 0.4" |
| February | 13°F | 30°F | 21°F | 0.5" |
| March | 28°F | 45°F | 35°F | 1.5" |
| April | 39°F | 59°F | 48°F | 3.6" |
| May | 49°F | 71°F | 59°F | 3.7" |
| June | 60°F | 80°F | 69°F | 4.4" |
| July | 64°F | 84°F | 73°F | 3.6" |
| August | 62°F | 81°F | 70°F | 3.4" |
| September | 54°F | 74°F | 63°F | 2.4" |
| October | 42°F | 60°F | 50°F | 2.5" |
| November | 31°F | 46°F | 38°F | 0.9" |
| December | 18°F | 31°F | 24°F | 1.3" |
| Index | Lewiston | Minnesota | National |
| Air quality index | 15 | 35 | 42 |
| Pollution index | 1,343,210 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 57 |
| Days with good air quality | 53 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Minneiska, MN | 97 | 15 | 70.0% |
| Peterson, MN | 260 | 15 | 70.0% |
| Stockton, MN | 839 | 15 | 70.0% |
| Utica, MN | 254 | 15 | 70.0% |
| Altura, MN | 451 | 15 | 70.0% |
| Lewiston, MN | 1,828 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| Gilbert, MN | 1,828 | 35 | 30.0% |
| Troy, TN | 1,828 | 26 | 48.0% |
| Baird, TX | 1,828 | 33 | 34.0% |
| Frontenac, QC | 1,828 | n/a | |
| Prairie City, IA | 1,827 | 39 | 22.0% |
| Lewiston, MN | 1,828 | 15 | 70.0% |
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