| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 36°F | 25°F | 0.7" |
| February | 21°F | 43°F | 31°F | 0.4" |
| March | 29°F | 55°F | 41°F | 0.6" |
| April | 34°F | 63°F | 48°F | 0.5" |
| May | 43°F | 73°F | 57°F | 0.8" |
| June | 53°F | 87°F | 71°F | 0.5" |
| July | 61°F | 92°F | 76°F | 0.6" |
| August | 58°F | 88°F | 72°F | 0.8" |
| September | 50°F | 80°F | 64°F | 1.2" |
| October | 38°F | 64°F | 50°F | 1.0" |
| November | 27°F | 51°F | 38°F | 0.2" |
| December | 16°F | 36°F | 26°F | 0.9" |
| Index | Ephraim | Utah | National |
| Air quality index | 46 | 45 | 42 |
| Pollution index | 2,685,200 | 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 | 0.360% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.090% |
| City | Population | Air Quality Index | National Avg. |
| Mount Pleasant, UT | 3,471 | 46 | 8.0% |
| Fayette, UT | 318 | 46 | 8.0% |
| Spring City, UT | 1,027 | 46 | 8.0% |
| Gunnison, UT | 3,511 | 46 | 8.0% |
| Levan, UT | 878 | 46 | 8.0% |
| Ephraim, UT | 7,222 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Twin Rivers, NJ | 7,221 | 41 | 18.0% |
| Lecanto, FL | 7,224 | 30 | 40.0% |
| University Park, IL | 7,224 | 55 | 10.0% |
| Huntertown, IN | 7,224 | 45 | 10.0% |
| Canfield, OH | 7,226 | 42 | 16.0% |
| Ephraim, UT | 7,222 | 46 | 8.0% |
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