| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 36°F | 25°F | 0.7" |
| February | 21°F | 43°F | 31°F | 0.4" |
| March | 29°F | 55°F | 41°F | 0.6" |
| April | 34°F | 63°F | 48°F | 0.5" |
| May | 43°F | 73°F | 57°F | 0.8" |
| June | 53°F | 87°F | 71°F | 0.5" |
| July | 61°F | 92°F | 76°F | 0.6" |
| August | 58°F | 88°F | 72°F | 0.8" |
| September | 50°F | 80°F | 64°F | 1.2" |
| October | 38°F | 64°F | 50°F | 1.0" |
| November | 27°F | 51°F | 38°F | 0.2" |
| December | 16°F | 36°F | 26°F | 0.9" |
| Index | Wellington | 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 | 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 | 0.360% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.090% |
| City | Population | Air Quality Index | National Avg. |
| Cleveland, UT | 545 | 46 | 8.0% |
| Kenilworth, UT | 119 | 46 | 8.0% |
| Carbonville, UT | 1,170 | 46 | 8.0% |
| Elmo, UT | 455 | 46 | 8.0% |
| Spring Glen, UT | 1,126 | 46 | 8.0% |
| Wellington, UT | 1,501 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Panora, IA | 1,501 | 39 | 22.0% |
| Shorewood-Tower Hills-Harbert, MI | 1,501 | 37 | 26.0% |
| McArthur, OH | 1,501 | 25 | 50.0% |
| Newton, AL | 1,502 | 35 | 30.0% |
| Hawthorne, FL | 1,500 | 35 | 30.0% |
| Wellington, UT | 1,501 | 46 | 8.0% |
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