| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 25°F | 17°F | 1.4" |
| February | 11°F | 28°F | 19°F | 2.3" |
| March | 26°F | 43°F | 33°F | 3.6" |
| April | 38°F | 59°F | 47°F | 5.8" |
| May | 49°F | 72°F | 59°F | 5.8" |
| June | 60°F | 80°F | 69°F | 7.3" |
| July | 63°F | 83°F | 73°F | 7.5" |
| August | 60°F | 80°F | 69°F | 7.2" |
| September | 52°F | 75°F | 62°F | 5.8" |
| October | 40°F | 60°F | 49°F | 6.8" |
| November | 27°F | 46°F | 35°F | 2.4" |
| December | 13°F | 29°F | 21°F | 2.9" |
| Index | Northrop | Minnesota | National |
| Air quality index | 15 | 35 | 42 |
| Pollution index | 1,155,680 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 118 |
| Days with good air quality | 118 |
| Days with moderate air quality | 0 |
| 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 | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Winnebago, MN | 1,261 | 15 | 70.0% |
| Fairmont, MN | 10,042 | 15 | 70.0% |
| Granada, MN | 228 | 15 | 70.0% |
| Truman, MN | 1,083 | 15 | 70.0% |
| Amboy, MN | 614 | 15 | 70.0% |
| Northrop, MN | 193 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| Russian Mission, AK | 193 | 31 | 38.0% |
| Rackerby, CA | 193 | 44 | 12.0% |
| Grand River, IA | 193 | 39 | 22.0% |
| Oakford, IL | 193 | 40 | 20.0% |
| Severy, KS | 193 | 22 | 56.0% |
| Northrop, MN | 193 | 15 | 70.0% |
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