| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 49°F | 32°F | 0.5" |
| February | 21°F | 52°F | 35°F | 0.4" |
| March | 29°F | 63°F | 44°F | 0.9" |
| April | 35°F | 68°F | 51°F | 1.5" |
| May | 43°F | 76°F | 59°F | 1.8" |
| June | 54°F | 89°F | 71°F | 1.3" |
| July | 60°F | 91°F | 74°F | 2.5" |
| August | 58°F | 88°F | 72°F | 1.9" |
| September | 51°F | 83°F | 66°F | 1.3" |
| October | 38°F | 72°F | 54°F | 1.1" |
| November | 28°F | 61°F | 43°F | 0.4" |
| December | 18°F | 49°F | 32°F | 0.6" |
| Index | Valdez | Colorado | National |
| Air quality index | 15 | 38 | 42 |
| Pollution index | 1,705,280 | 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 | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Segundo, CO | 85 | 15 | 70.0% |
| Cokedale, CO | 87 | 15 | 70.0% |
| Weston, CO | 16 | 15 | 70.0% |
| Starkville, CO | 129 | 15 | 70.0% |
| Jansen, CO | 224 | 20 | 60.0% |
| Valdez, CO | 0 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| Chase, AK | 0 | 31 | 38.0% |
| Chiniak, AK | 0 | 31 | 38.0% |
| Chisana, AK | 0 | 31 | 38.0% |
| Dot Lake, AK | 0 | 38 | 24.0% |
| Eureka Roadhouse, AK | 0 | 31 | 38.0% |
| Valdez, CO | 0 | 15 | 70.0% |
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