| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 6°F | 23°F | 14°F | 1.2" |
| February | 8°F | 27°F | 17°F | 1.0" |
| March | 22°F | 42°F | 31°F | 2.4" |
| April | 34°F | 56°F | 44°F | 3.9" |
| May | 45°F | 69°F | 56°F | 7.5" |
| June | 54°F | 77°F | 65°F | 5.5" |
| July | 59°F | 82°F | 70°F | 6.6" |
| August | 57°F | 79°F | 67°F | 8.4" |
| September | 50°F | 72°F | 60°F | 5.7" |
| October | 38°F | 57°F | 47°F | 6.0" |
| November | 26°F | 43°F | 34°F | 2.3" |
| December | 12°F | 26°F | 19°F | 1.8" |
| Index | Isanti | Minnesota | National |
| Air quality index | 46 | 35 | 42 |
| Pollution index | 1,318,690 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 214 |
| Days with moderate air quality | 148 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Nowthen, MN | 4,715 | 46 | 8.0% |
| Oak Grove, MN | 8,819 | 46 | 8.0% |
| North Branch, MN | 10,585 | 46 | 8.0% |
| Stanchfield, MN | 73 | 46 | 8.0% |
| Bethel, MN | 443 | 46 | 8.0% |
| Isanti, MN | 6,016 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Arlington Heights, PA | 6,015 | 34 | 32.0% |
| Grafton, OH | 6,017 | 50 | = 100 |
| Cherryville, NC | 6,018 | 36 | 28.0% |
| Verchères, QC | 6,018 | n/a | |
| Gardnerville, NV | 6,013 | 13 | 74.0% |
| Isanti, MN | 6,016 | 46 | 8.0% |
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