| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 53°F | 41°F | 4.6" |
| February | 36°F | 61°F | 47°F | 1.8" |
| March | 43°F | 70°F | 55°F | 2.5" |
| April | 49°F | 77°F | 62°F | 1.2" |
| May | 59°F | 87°F | 72°F | 1.2" |
| June | 69°F | 99°F | 85°F | 2.1" |
| July | 76°F | 103°F | 89°F | 3.2" |
| August | 72°F | 100°F | 85°F | 2.1" |
| September | 65°F | 93°F | 78°F | 1.3" |
| October | 52°F | 79°F | 64°F | 3.3" |
| November | 40°F | 65°F | 51°F | 0.9" |
| December | 31°F | 51°F | 40°F | 1.9" |
| Index | Washington | Utah | National |
| Air quality index | 44 | 45 | 42 |
| Pollution index | 1,560,380 | 3,340,369 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 291 |
| Days with moderate air quality | 74 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Veyo, UT | 314 | 44 | 12.0% |
| St. George, UT | 87,176 | 44 | 12.0% |
| Dammeron Valley, UT | 738 | 44 | 12.0% |
| Hurricane, UT | 18,112 | 44 | 12.0% |
| Santa Clara, UT | 7,868 | 44 | 12.0% |
| Washington, UT | 28,192 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Enterprise, AL | 28,170 | 35 | 30.0% |
| Benicia, CA | 28,158 | 40 | 20.0% |
| Oakleaf Plantation, FL | 28,153 | 43 | 14.0% |
| Newburgh, NY | 28,146 | 36 | 28.0% |
| Eagle, ID | 28,145 | 36 | 28.0% |
| Washington, UT | 28,192 | 44 | 12.0% |
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