| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -1°F | 27°F | 12°F | 0.3" |
| February | 3°F | 31°F | 16°F | 0.3" |
| March | 14°F | 43°F | 28°F | 0.5" |
| April | 22°F | 54°F | 37°F | 0.6" |
| May | 30°F | 63°F | 46°F | 1.5" |
| June | 37°F | 75°F | 57°F | 0.6" |
| July | 44°F | 84°F | 64°F | 0.8" |
| August | 41°F | 81°F | 61°F | 0.7" |
| September | 33°F | 72°F | 52°F | 0.9" |
| October | 24°F | 57°F | 39°F | 0.7" |
| November | 12°F | 43°F | 26°F | 0.2" |
| December | 0°F | 29°F | 14°F | 0.3" |
| Index | Boulder | Wyoming | National |
| Air quality index | 45 | 39 | 42 |
| Pollution index | 971,862 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 294 |
| Days with moderate air quality | 69 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Cora, WY | 98 | 43 | 14.0% |
| Pinedale, WY | 2,173 | 43 | 14.0% |
| Boulder, WY | 25 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Mendeltna, AK | 25 | 31 | 38.0% |
| Beyerville, AZ | 25 | 31 | 38.0% |
| Butte Meadows, CA | 25 | 46 | 8.0% |
| Lazy Lake, FL | 25 | 41 | 18.0% |
| Blanchard, IA | 25 | 43 | 14.0% |
| Boulder, WY | 25 | 45 | 10.0% |
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