| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 38°F | 28°F | 1.3" |
| February | 27°F | 47°F | 36°F | 1.1" |
| March | 33°F | 58°F | 45°F | 1.8" |
| April | 38°F | 64°F | 51°F | 2.4" |
| May | 46°F | 74°F | 60°F | 2.0" |
| June | 57°F | 88°F | 72°F | 0.9" |
| July | 67°F | 96°F | 82°F | 0.5" |
| August | 64°F | 93°F | 79°F | 0.7" |
| September | 54°F | 83°F | 68°F | 1.3" |
| October | 42°F | 68°F | 54°F | 1.2" |
| November | 32°F | 54°F | 42°F | 1.2" |
| December | 22°F | 40°F | 30°F | 1.6" |
| Index | Marion | Utah | National |
| Air quality index | 51 | 45 | 42 |
| Pollution index | 688,749 | 3,340,369 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 170 |
| Days with moderate air quality | 178 |
| Days w/ poor A.Q. for sensitive groups | 17 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Interlaken, UT | 112 | 46 | 8.0% |
| Daniel, UT | 1,147 | 46 | 8.0% |
| Midway, UT | 5,210 | 46 | 8.0% |
| Francis, UT | 1,364 | 46 | 8.0% |
| Samak, UT | 98 | 46 | 8.0% |
| Marion, UT | 721 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Wallace, CA | 721 | 45 | 10.0% |
| Quasqueton, IA | 721 | 39 | 22.0% |
| Dakota, IL | 721 | 42 | 16.0% |
| Saybrook, IL | 721 | 44 | 12.0% |
| St. Bernice, IN | 721 | 45 | 10.0% |
| Marion, UT | 721 | 51 | 2.0% |
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