| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 25°F | 17°F | 0.2" |
| February | 11°F | 28°F | 18°F | 0.3" |
| March | 25°F | 43°F | 33°F | 1.1" |
| April | 38°F | 59°F | 47°F | 2.2" |
| May | 50°F | 69°F | 58°F | 1.3" |
| June | 61°F | 82°F | 70°F | 1.9" |
| July | 64°F | 84°F | 74°F | 0.9" |
| August | 60°F | 80°F | 70°F | 8.9" |
| September | 55°F | 76°F | 64°F | 11.0" |
| October | 44°F | 62°F | 51°F | 9.0" |
| November | 27°F | 44°F | 34°F | 0.6" |
| December | 11°F | 24°F | 17°F | 1.0" |
| Index | Zimmerman | 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. |
| Becker, MN | 4,919 | 32 | 36.0% |
| Monticello, MN | 13,700 | 32 | 36.0% |
| Princeton, MN | 4,701 | 32 | 36.0% |
| Big Lake CDP, MN | 375 | 32 | 36.0% |
| Big Lake, MN | 11,085 | 32 | 36.0% |
| Zimmerman, MN | 5,831 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Homer, AK | 5,830 | 31 | 38.0% |
| Bay Harbor Islands, FL | 5,832 | 41 | 18.0% |
| Medina, NY | 5,829 | 39 | 22.0% |
| Granville, OH | 5,829 | 41 | 18.0% |
| Loudon, TN | 5,829 | 53 | 6.0% |
| Zimmerman, MN | 5,831 | 32 | 36.0% |
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