| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 6°F | 27°F | 16°F | 0.5" |
| February | 15°F | 38°F | 25°F | 0.3" |
| March | 26°F | 54°F | 40°F | 0.7" |
| April | 33°F | 63°F | 48°F | 0.6" |
| May | 41°F | 73°F | 57°F | 1.1" |
| June | 51°F | 86°F | 69°F | 0.4" |
| July | 58°F | 91°F | 75°F | 0.6" |
| August | 55°F | 88°F | 71°F | 0.8" |
| September | 47°F | 79°F | 62°F | 1.4" |
| October | 35°F | 63°F | 48°F | 1.0" |
| November | 24°F | 49°F | 35°F | 0.4" |
| December | 11°F | 30°F | 20°F | 0.8" |
| Index | Vernal | Utah | National |
| Air quality index | 49 | 45 | 42 |
| Pollution index | 3,914,890 | 3,340,369 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 223 |
| Days with moderate air quality | 125 |
| Days w/ poor A.Q. for sensitive groups | 12 |
| Days with unhealthy air quality | 4 |
| Pollutant | Total |
| Arsenic | 0.110% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.030% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Jensen, UT | 299 | 49 | 2.0% |
| Maeser, UT | 4,064 | 49 | 2.0% |
| Naples, UT | 3,512 | 49 | 2.0% |
| Vernal, UT | 10,449 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Tanaina, AK | 10,449 | 31 | 38.0% |
| Chester, NS | 10,450 | n/a | |
| Mount Sinai, NY | 10,446 | 43 | 14.0% |
| Budd Lake, NJ | 10,444 | 34 | 32.0% |
| Sebring, FL | 10,454 | 36 | 28.0% |
| Vernal, UT | 10,449 | 49 | 2.0% |
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