| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 24°F | 15°F | 1.0" |
| February | 9°F | 27°F | 17°F | 1.3" |
| March | 24°F | 42°F | 32°F | 3.4" |
| April | 36°F | 57°F | 46°F | 3.6" |
| May | 47°F | 70°F | 58°F | 5.4" |
| June | 58°F | 78°F | 67°F | 4.3" |
| July | 62°F | 83°F | 72°F | 4.8" |
| August | 60°F | 80°F | 69°F | 6.9" |
| September | 52°F | 73°F | 61°F | 3.4" |
| October | 40°F | 58°F | 48°F | 4.7" |
| November | 27°F | 44°F | 35°F | 2.6" |
| December | 12°F | 27°F | 19°F | 1.9" |
| Index | Annandale | Minnesota | National |
| Air quality index | 32 | 35 | 42 |
| Pollution index | 2,322,880 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 344 |
| Days with good air quality | 313 |
| Days with moderate air quality | 31 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.360% |
| Mercury | 0.290% |
| City | Population | Air Quality Index | National Avg. |
| Darwin, MN | 302 | 32 | 36.0% |
| Kingston, MN | 222 | 32 | 36.0% |
| Watkins, MN | 859 | 32 | 36.0% |
| Clearwater, MN | 1,636 | 32 | 36.0% |
| Dassel, MN | 1,443 | 32 | 36.0% |
| Annandale, MN | 3,420 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Wynantskill, NY | 3,420 | 37 | 26.0% |
| Alexander, MB | 3,420 | n/a | |
| Morada, CA | 3,419 | 45 | 10.0% |
| Havre-Saint-Pierre, QC | 3,419 | n/a | |
| Germantown Hills, IL | 3,421 | 41 | 18.0% |
| Annandale, MN | 3,420 | 32 | 36.0% |
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