| 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 | Washam | Wyoming | National |
| Air quality index | 49 | 39 | 42 |
| Pollution index | 672,823 | 1,779,975 | 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 | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Flaming Gorge, UT | 81 | 46 | 8.0% |
| McKinnon, WY | 65 | 49 | 2.0% |
| Manila, UT | 276 | 49 | 2.0% |
| Washam, WY | 67 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Zinc, AR | 67 | 36 | 28.0% |
| Washington Park, AZ | 67 | 60 | 20.0% |
| Beaver, IA | 67 | 37 | 26.0% |
| Curlew, IA | 67 | 15 | 70.0% |
| Kinross, IA | 67 | 35 | 30.0% |
| Washam, WY | 67 | 49 | 2.0% |
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