| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 4°F | 21°F | 12°F | 0.3" |
| February | 6°F | 24°F | 14°F | 0.3" |
| March | 21°F | 39°F | 29°F | 1.1" |
| April | 34°F | 55°F | 44°F | 2.1" |
| May | 46°F | 68°F | 56°F | 3.3" |
| June | 57°F | 77°F | 66°F | 4.0" |
| July | 62°F | 83°F | 72°F | 4.0" |
| August | 59°F | 79°F | 69°F | 4.6" |
| September | 52°F | 72°F | 61°F | 3.2" |
| October | 39°F | 57°F | 47°F | 2.9" |
| November | 25°F | 41°F | 32°F | 0.9" |
| December | 9°F | 24°F | 16°F | 0.5" |
| Index | Clontarf | Minnesota | National |
| Air quality index | 32 | 35 | 42 |
| Pollution index | 616,877 | 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 | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Morris, MN | 5,320 | 25 | 50.0% |
| Danvers, MN | 168 | 32 | 36.0% |
| De Graff, MN | 99 | 32 | 36.0% |
| Hancock, MN | 746 | 32 | 36.0% |
| Murdock, MN | 232 | 32 | 36.0% |
| Clontarf, MN | 91 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Lowell Point, AK | 91 | 31 | 38.0% |
| Guion, AR | 91 | 36 | 28.0% |
| Hat Creek, CA | 91 | 42 | 16.0% |
| Lake Davis, CA | 91 | 44 | 12.0% |
| Peoria, CO | 91 | 58 | 16.0% |
| Clontarf, MN | 91 | 32 | 36.0% |
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