| 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 | Delta | Utah | National |
| Air quality index | 46 | 45 | 42 |
| Pollution index | 2,685,200 | 3,340,369 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 253 |
| Days with moderate air quality | 111 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.360% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.090% |
| City | Population | Air Quality Index | National Avg. |
| Lynndyl, UT | 84 | 46 | 8.0% |
| Hinckley, UT | 812 | 46 | 8.0% |
| Deseret, UT | 249 | 46 | 8.0% |
| Oak City, UT | 767 | 46 | 8.0% |
| Oasis, UT | 29 | 46 | 8.0% |
| Delta, UT | 3,604 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Fairbury, IL | 3,604 | 44 | 12.0% |
| Pine Lawn, MO | 3,604 | 54 | 8.0% |
| Frederick, OK | 3,604 | 43 | 14.0% |
| Saluda, SC | 3,603 | 47 | 6.0% |
| Okanagan-Similkameen C, BC | 3,603 | n/a | |
| Delta, UT | 3,604 | 46 | 8.0% |
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