| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 27°F | 3.5" |
| February | 26°F | 42°F | 33°F | 2.4" |
| March | 34°F | 53°F | 42°F | 3.1" |
| April | 38°F | 60°F | 48°F | 4.1" |
| May | 46°F | 70°F | 57°F | 4.9" |
| June | 56°F | 83°F | 69°F | 3.2" |
| July | 65°F | 91°F | 78°F | 2.6" |
| August | 63°F | 88°F | 75°F | 3.0" |
| September | 54°F | 78°F | 65°F | 4.4" |
| October | 42°F | 63°F | 52°F | 3.7" |
| November | 33°F | 50°F | 40°F | 3.4" |
| December | 22°F | 36°F | 28°F | 3.8" |
| Index | Farmington | 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. |
| Layton, UT | 77,268 | 45 | 10.0% |
| Syracuse, UT | 30,366 | 45 | 10.0% |
| Riverdale, UT | 8,826 | 45 | 10.0% |
| Washington Terrace, UT | 9,181 | 45 | 10.0% |
| Fruit Heights, UT | 6,205 | 45 | 10.0% |
| Farmington, UT | 24,439 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Essa, ON | 24,435 | n/a | |
| Derby, KS | 24,428 | 40 | 20.0% |
| Dinuba, CA | 24,455 | 66 | 32.0% |
| Candler-McAfee, GA | 24,419 | 52 | 4.0% |
| Wilsonville, OR | 24,413 | 38 | 24.0% |
| Farmington, UT | 24,439 | 51 | 2.0% |
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