| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 39°F | 28°F | 2.2" |
| February | 23°F | 47°F | 36°F | 1.8" |
| March | 31°F | 58°F | 45°F | 3.2" |
| April | 35°F | 65°F | 51°F | 2.0" |
| May | 45°F | 75°F | 61°F | 3.1" |
| June | 56°F | 86°F | 74°F | 5.1" |
| July | 64°F | 96°F | 82°F | 1.3" |
| August | 62°F | 93°F | 79°F | 2.4" |
| September | 50°F | 82°F | 68°F | 3.9" |
| October | 36°F | 66°F | 52°F | 3.1" |
| November | 25°F | 53°F | 40°F | 1.9" |
| December | 16°F | 38°F | 28°F | 2.4" |
| Index | Fayette | Utah | National |
| Air quality index | 46 | 45 | 42 |
| Pollution index | 17,298,700 | 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 | 0.020% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 1.190% |
| City | Population | Air Quality Index | National Avg. |
| Scipio, UT | 367 | 46 | 8.0% |
| Ephraim, UT | 7,222 | 46 | 8.0% |
| Sterling, UT | 377 | 46 | 8.0% |
| Manti, UT | 3,671 | 46 | 8.0% |
| Centerfield, UT | 1,531 | 46 | 8.0% |
| Fayette, UT | 318 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Mountain Ranch, CA | 318 | 39 | 22.0% |
| Red Cliff, CO | 318 | 47 | 6.0% |
| Redvale, CO | 318 | 44 | 12.0% |
| Dupont, IN | 318 | 35 | 30.0% |
| McCune, KS | 318 | 38 | 24.0% |
| Fayette, UT | 318 | 46 | 8.0% |
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