| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 24°F | 16°F | 1.1" |
| February | 10°F | 28°F | 18°F | 2.5" |
| March | 25°F | 42°F | 33°F | 3.5" |
| April | 37°F | 58°F | 47°F | 4.5" |
| May | 48°F | 71°F | 59°F | 7.9" |
| June | 59°F | 80°F | 68°F | 6.7" |
| July | 63°F | 84°F | 73°F | 5.2" |
| August | 60°F | 81°F | 70°F | 6.5" |
| September | 53°F | 74°F | 62°F | 4.2" |
| October | 40°F | 60°F | 49°F | 4.5" |
| November | 27°F | 45°F | 35°F | 3.2" |
| December | 13°F | 28°F | 20°F | 2.0" |
| Index | Winthrop | Minnesota | National |
| Air quality index | 46 | 35 | 42 |
| Pollution index | 848,330 | 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 | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.003% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Buffalo Lake, MN | 653 | 32 | 36.0% |
| Stewart, MN | 610 | 32 | 36.0% |
| Gibbon, MN | 806 | 32 | 36.0% |
| Lafayette, MN | 545 | 46 | 8.0% |
| Arlington, MN | 2,451 | 46 | 8.0% |
| Winthrop, MN | 1,317 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Reidville, SC | 1,317 | 44 | 12.0% |
| Ames Lake, WA | 1,317 | 45 | 10.0% |
| Augusta, WI | 1,317 | 34 | 32.0% |
| Julian, CA | 1,318 | 64 | 28.0% |
| La Harpe, IL | 1,318 | 29 | 42.0% |
| Winthrop, MN | 1,317 | 46 | 8.0% |
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