| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 31°F | 21°F | 0.4" |
| February | 16°F | 33°F | 24°F | 0.4" |
| March | 23°F | 43°F | 32°F | 0.5" |
| April | 28°F | 52°F | 39°F | 0.9" |
| May | 36°F | 62°F | 48°F | 1.9" |
| June | 45°F | 75°F | 60°F | 0.8" |
| July | 53°F | 84°F | 68°F | 0.5" |
| August | 51°F | 82°F | 66°F | 0.9" |
| September | 43°F | 72°F | 56°F | 1.3" |
| October | 33°F | 58°F | 44°F | 0.9" |
| November | 23°F | 45°F | 33°F | 0.5" |
| December | 14°F | 31°F | 22°F | 0.4" |
| Index | Coalville | Utah | National |
| Air quality index | 51 | 45 | 42 |
| Pollution index | 17,030,300 | 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 | 0.280% |
| Benzene | 0.230% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.360% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Morgan, UT | 4,259 | 45 | 10.0% |
| Echo, UT | 44 | 51 | 2.0% |
| Oakley, UT | 1,600 | 51 | 2.0% |
| Summit Park, UT | 8,177 | 51 | 2.0% |
| Henefer, UT | 844 | 51 | 2.0% |
| Coalville, UT | 2,066 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| El Portal, FL | 2,066 | 41 | 18.0% |
| Dillingham, AK | 2,065 | 31 | 38.0% |
| Camino, CA | 2,065 | 52 | 4.0% |
| Morgan, GA | 2,067 | 40 | 20.0% |
| Elkton, KY | 2,065 | 40 | 20.0% |
| Coalville, UT | 2,066 | 51 | 2.0% |
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