| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 26°F | 17°F | 0.1" |
| February | 11°F | 29°F | 20°F | 3.2" |
| March | 26°F | 44°F | 34°F | 2.7" |
| April | 38°F | 59°F | 48°F | 2.7" |
| May | 49°F | 71°F | 59°F | 3.9" |
| June | 59°F | 80°F | 69°F | 4.8" |
| July | 63°F | 85°F | 74°F | 3.7" |
| August | 61°F | 82°F | 71°F | 4.6" |
| September | 54°F | 75°F | 63°F | 2.9" |
| October | 41°F | 61°F | 50°F | 1.6" |
| November | 30°F | 46°F | 37°F | 1.0" |
| December | 15°F | 29°F | 22°F | 0.0" |
| Index | Bellechester | Minnesota | National |
| Air quality index | 37 | 35 | 42 |
| Pollution index | 2,142,550 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 216 |
| Days with good air quality | 203 |
| Days with moderate air quality | 13 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.510% |
| City | Population | Air Quality Index | National Avg. |
| Mazeppa, MN | 935 | 36 | 28.0% |
| Millville, MN | 267 | 36 | 28.0% |
| Oronoco, MN | 1,517 | 36 | 28.0% |
| Pine Island, MN | 3,629 | 36 | 28.0% |
| Hammond, MN | 109 | 36 | 28.0% |
| Bellechester, MN | 154 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Alicia, AR | 154 | 45 | 10.0% |
| Crystal Beach, AZ | 154 | 13 | 74.0% |
| Verdi, CA | 154 | 46 | 8.0% |
| Amherst, CO | 154 | 19 | 62.0% |
| Charleston Park, FL | 154 | 36 | 28.0% |
| Bellechester, MN | 154 | 37 | 26.0% |
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