| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 24°F | 16°F | 1.5" |
| February | 10°F | 27°F | 17°F | 1.1" |
| March | 25°F | 41°F | 32°F | 8.7" |
| April | 36°F | 57°F | 45°F | 2.7" |
| May | 47°F | 69°F | 57°F | 4.2" |
| June | 58°F | 78°F | 67°F | 7.0" |
| July | 62°F | 82°F | 72°F | 4.8" |
| August | 59°F | 79°F | 68°F | 11.0" |
| September | 51°F | 73°F | 61°F | 8.7" |
| October | 39°F | 59°F | 48°F | 6.6" |
| November | 27°F | 44°F | 34°F | 5.0" |
| December | 13°F | 27°F | 20°F | 1.5" |
| Index | Hector | Minnesota | National |
| Air quality index | 32 | 35 | 42 |
| Pollution index | 1,148,020 | 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 | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.020% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Morton, MN | 387 | 32 | 36.0% |
| Bird Island, MN | 928 | 32 | 36.0% |
| Cedar Mills, MN | 42 | 32 | 36.0% |
| Buffalo Lake, MN | 672 | 32 | 36.0% |
| Lake Lillian, MN | 267 | 32 | 36.0% |
| Hector, MN | 1,134 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Healy, AK | 1,134 | 38 | 24.0% |
| Percy, IL | 1,134 | 43 | 14.0% |
| Hillsboro, MS | 1,134 | 44 | 12.0% |
| Silver City, NC | 1,134 | 41 | 18.0% |
| Adair Village, OR | 1,134 | 28 | 44.0% |
| Hector, MN | 1,134 | 32 | 36.0% |