| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 25°F | 16°F | 0.4" |
| February | 10°F | 29°F | 18°F | 0.6" |
| March | 24°F | 43°F | 33°F | 1.4" |
| April | 37°F | 59°F | 47°F | 2.9" |
| May | 48°F | 72°F | 59°F | 3.9" |
| June | 59°F | 81°F | 69°F | 5.6" |
| July | 63°F | 86°F | 74°F | 2.3" |
| August | 60°F | 82°F | 70°F | 4.8" |
| September | 52°F | 76°F | 63°F | 3.4" |
| October | 40°F | 61°F | 49°F | 3.0" |
| November | 26°F | 46°F | 35°F | 0.9" |
| December | 12°F | 28°F | 19°F | 1.0" |
| Index | Morton | Minnesota | National |
| Air quality index | 32 | 35 | 42 |
| Pollution index | 179,440 | 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 | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Fairfax, MN | 1,135 | 32 | 36.0% |
| Morgan, MN | 844 | 32 | 36.0% |
| Hector, MN | 1,093 | 32 | 36.0% |
| Clements, MN | 139 | 32 | 36.0% |
| Bird Island, MN | 905 | 32 | 36.0% |
| Morton, MN | 373 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Shiloh, AL | 373 | 39 | 22.0% |
| Spreckels, CA | 373 | 37 | 26.0% |
| Brownsdale, FL | 373 | 41 | 18.0% |
| Brandon, IA | 373 | 39 | 22.0% |
| Protivin, IA | 373 | 39 | 22.0% |
| Morton, MN | 373 | 32 | 36.0% |
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