| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 36°F | 24°F | 0.3" |
| February | 23°F | 48°F | 35°F | 0.4" |
| March | 31°F | 62°F | 46°F | 0.3" |
| April | 38°F | 69°F | 54°F | 0.4" |
| May | 47°F | 79°F | 64°F | 0.6" |
| June | 58°F | 93°F | 78°F | 0.3" |
| July | 66°F | 98°F | 82°F | 0.6" |
| August | 62°F | 94°F | 78°F | 0.8" |
| September | 53°F | 85°F | 69°F | 0.8" |
| October | 40°F | 70°F | 55°F | 1.0" |
| November | 28°F | 56°F | 41°F | 0.4" |
| December | 15°F | 39°F | 27°F | 0.6" |
| Index | Green River | Utah | National |
| Air quality index | 46 | 45 | 42 |
| Pollution index | 5,993,500 | 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 | 0.000% |
| Benzene | 0.130% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Green River, UT | 793 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Fieldbrook, CA | 793 | 27 | 46.0% |
| Holly, CO | 793 | 15 | 70.0% |
| Wiscon, FL | 793 | 30 | 40.0% |
| Cuba, NM | 793 | 8 | 84.0% |
| Paraje, NM | 793 | 53 | 6.0% |
| Green River, UT | 793 | 46 | 8.0% |
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