| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -2°F | 35°F | 15°F | 0.4" |
| February | 6°F | 43°F | 24°F | 0.3" |
| March | 17°F | 56°F | 36°F | 0.6" |
| April | 24°F | 63°F | 44°F | 0.7" |
| May | 32°F | 71°F | 52°F | 0.7" |
| June | 40°F | 83°F | 63°F | 0.3" |
| July | 47°F | 85°F | 66°F | 1.4" |
| August | 44°F | 82°F | 63°F | 1.1" |
| September | 36°F | 77°F | 56°F | 1.1" |
| October | 25°F | 66°F | 44°F | 0.8" |
| November | 12°F | 53°F | 31°F | 0.5" |
| December | 0°F | 38°F | 18°F | 0.5" |
| Index | Conejos | Colorado | National |
| Air quality index | 15 | 38 | 42 |
| Pollution index | 949,248 | 2,068,342 | 2,726,193 |
| Measurement | Total |
| Days measured | 358 |
| Days with good air quality | 334 |
| Days with moderate air quality | 24 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Romeo, CO | 306 | 15 | 70.0% |
| Sanford, CO | 1,260 | 15 | 70.0% |
| Antonito, CO | 730 | 15 | 70.0% |
| Capulin, CO | 164 | 15 | 70.0% |
| Manassa, CO | 1,039 | 15 | 70.0% |
| Conejos, CO | 18 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| Rockville, AL | 18 | 42 | 16.0% |
| Shoshone, CA | 18 | 15 | 70.0% |
| Piedra, CO | 18 | 44 | 12.0% |
| Elkport, IA | 18 | 29 | 42.0% |
| Bentley, IL | 18 | 29 | 42.0% |
| Conejos, CO | 18 | 15 | 70.0% |
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