| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 24°F | 16°F | 1.7" |
| February | 10°F | 28°F | 18°F | 2.5" |
| March | 25°F | 42°F | 32°F | 2.7" |
| April | 35°F | 57°F | 45°F | 2.9" |
| May | 46°F | 70°F | 57°F | 6.8" |
| June | 57°F | 79°F | 68°F | 6.4" |
| July | 61°F | 83°F | 72°F | 6.0" |
| August | 59°F | 80°F | 68°F | 5.7" |
| September | 51°F | 74°F | 61°F | 7.5" |
| October | 38°F | 60°F | 48°F | 4.9" |
| November | 26°F | 45°F | 34°F | 2.6" |
| December | 12°F | 27°F | 19°F | 0.9" |
| Index | Slayton | Minnesota | National |
| Air quality index | 32 | 35 | 42 |
| Pollution index | 1,069,770 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 327 |
| Days with moderate air quality | 35 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.020% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Dovray, MN | 41 | 32 | 36.0% |
| Chandler, MN | 312 | 32 | 36.0% |
| The Lakes, MN | 661 | 32 | 36.0% |
| Dundee, MN | 72 | 32 | 36.0% |
| Fulda, MN | 1,314 | 32 | 36.0% |
| Slayton, MN | 1,953 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Houston, AK | 1,952 | 31 | 38.0% |
| Huachuca City, AZ | 1,954 | 45 | 10.0% |
| Arcade, GA | 1,954 | 44 | 12.0% |
| Winfield, MO | 1,954 | 54 | 8.0% |
| Weedsport, NY | 1,954 | 37 | 26.0% |
| Slayton, MN | 1,953 | 32 | 36.0% |
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