| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 47°F | 33°F | 4.4" |
| February | 26°F | 54°F | 40°F | 1.9" |
| March | 32°F | 64°F | 49°F | 2.6" |
| April | 40°F | 72°F | 56°F | 3.0" |
| May | 49°F | 83°F | 68°F | 1.2" |
| June | 56°F | 93°F | 77°F | 1.8" |
| July | 66°F | 104°F | 87°F | 1.6" |
| August | 62°F | 96°F | 80°F | 2.7" |
| September | 52°F | 87°F | 71°F | 7.6" |
| October | 39°F | 73°F | 56°F | 5.4" |
| November | 25°F | 59°F | 42°F | 8.1" |
| December | 17°F | 44°F | 30°F | 4.0" |
| Index | Lyman | 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. |
| Teasdale, UT | 194 | 46 | 8.0% |
| Bicknell, UT | 277 | 46 | 8.0% |
| Torrey, UT | 282 | 46 | 8.0% |
| Fremont, UT | 102 | 46 | 8.0% |
| Loa, UT | 667 | 46 | 8.0% |
| Lyman, UT | 277 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Freedom Acres, AZ | 277 | 60 | 20.0% |
| Goodyear Village, AZ | 277 | 74 | 48.0% |
| Crowley, CO | 277 | 20 | 60.0% |
| Meservey, IA | 277 | 15 | 70.0% |
| Bardolph, IL | 277 | 29 | 42.0% |
| Lyman, UT | 277 | 46 | 8.0% |
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