| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 38°F | 23°F | 1.3" |
| February | 16°F | 44°F | 30°F | 0.7" |
| March | 23°F | 56°F | 39°F | 0.6" |
| April | 28°F | 64°F | 46°F | 0.7" |
| May | 35°F | 72°F | 54°F | 0.9" |
| June | 43°F | 85°F | 66°F | 0.4" |
| July | 53°F | 88°F | 70°F | 1.6" |
| August | 51°F | 85°F | 68°F | 1.4" |
| September | 43°F | 78°F | 60°F | 1.8" |
| October | 31°F | 66°F | 48°F | 1.3" |
| November | 22°F | 54°F | 37°F | 0.8" |
| December | 13°F | 40°F | 26°F | 1.1" |
| Index | Bayfield | Colorado | National |
| Air quality index | 44 | 38 | 42 |
| Pollution index | 2,963,190 | 2,068,342 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 276 |
| Days with moderate air quality | 89 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 1.050% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.040% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Arboles, CO | 410 | 44 | 12.0% |
| Ignacio, CO | 1,411 | 44 | 12.0% |
| Piedra, CO | 18 | 44 | 12.0% |
| Southern Ute, CO | 199 | 44 | 12.0% |
| Bayfield, CO | 2,550 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Alturas, CA | 2,550 | 29 | 42.0% |
| Sabetha, KS | 2,550 | 43 | 14.0% |
| Nicoma Park, OK | 2,550 | 48 | 4.0% |
| Marysville, PA | 2,550 | 44 | 12.0% |
| Vassar, MI | 2,549 | 26 | 48.0% |
| Bayfield, CO | 2,550 | 44 | 12.0% |
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