| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 39°F | 26°F | 2.9" |
| February | 21°F | 46°F | 32°F | 1.2" |
| March | 27°F | 57°F | 41°F | 1.6" |
| April | 32°F | 65°F | 47°F | 1.8" |
| May | 40°F | 76°F | 58°F | 2.0" |
| June | 49°F | 89°F | 71°F | 2.0" |
| July | 58°F | 95°F | 78°F | 1.7" |
| August | 56°F | 93°F | 75°F | 1.8" |
| September | 46°F | 84°F | 65°F | 2.2" |
| October | 35°F | 70°F | 51°F | 2.8" |
| November | 24°F | 56°F | 38°F | 1.9" |
| December | 16°F | 40°F | 27°F | 2.2" |
| Index | Marysvale | Utah | National |
| Air quality index | 46 | 45 | 42 |
| Pollution index | 488,032 | 3,340,369 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 265 |
| Days with moderate air quality | 99 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Junction, UT | 271 | 44 | 12.0% |
| Joseph, UT | 495 | 46 | 8.0% |
| Monroe, UT | 2,322 | 46 | 8.0% |
| Marysvale, UT | 524 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Orleans, IA | 524 | 32 | 36.0% |
| Washburn, IA | 524 | 39 | 22.0% |
| Keithsburg, IL | 524 | 32 | 36.0% |
| Patriot, IN | 524 | 54 | 8.0% |
| Richmond, KS | 524 | 41 | 18.0% |
| Marysvale, UT | 524 | 46 | 8.0% |
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