| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 26°F | 18°F | 0.9" |
| February | 12°F | 29°F | 19°F | 1.6" |
| March | 26°F | 43°F | 33°F | 2.3" |
| April | 37°F | 58°F | 46°F | 3.3" |
| May | 49°F | 71°F | 59°F | 7.4" |
| June | 60°F | 80°F | 69°F | 8.4" |
| July | 64°F | 84°F | 73°F | 6.5" |
| August | 61°F | 80°F | 70°F | 7.5" |
| September | 53°F | 75°F | 62°F | 8.7" |
| October | 41°F | 61°F | 50°F | 4.9" |
| November | 27°F | 45°F | 35°F | 3.3" |
| December | 14°F | 29°F | 21°F | 2.3" |
| Index | Milroy | 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. |
| Echo, MN | 275 | 32 | 36.0% |
| Seaforth, MN | 67 | 32 | 36.0% |
| Cottonwood, MN | 1,180 | 32 | 36.0% |
| Garvin, MN | 110 | 32 | 36.0% |
| Lamberton, MN | 831 | 32 | 36.0% |
| Milroy, MN | 188 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Adak, AK | 188 | 31 | 38.0% |
| Halibut Cove, AK | 188 | 31 | 38.0% |
| Nikolaevsk, AK | 188 | 31 | 38.0% |
| Bluff City, AR | 188 | 32 | 36.0% |
| Pinion Pines, AZ | 188 | 13 | 74.0% |
| Milroy, MN | 188 | 32 | 36.0% |
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