| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 31°F | 24°F | 16.0" |
| February | 18°F | 31°F | 24°F | 3.8" |
| March | 21°F | 34°F | 27°F | 5.4" |
| April | 32°F | 47°F | 39°F | 4.1" |
| May | 40°F | 55°F | 47°F | 1.9" |
| June | 46°F | 63°F | 54°F | 4.9" |
| July | 48°F | 63°F | 55°F | 2.4" |
| August | 48°F | 63°F | 54°F | 1.1" |
| September | 43°F | 56°F | 48°F | 7.5" |
| October | 34°F | 44°F | 38°F | 3.9" |
| November | 24°F | 34°F | 28°F | 8.9" |
| December | 21°F | 32°F | 26°F | 7.9" |
| Index | Valdez | Alaska | National |
| Air quality index | 31 | 30 | 42 |
| Pollution index | 749,334 | 11,243,194 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 262 |
| Days with moderate air quality | 92 |
| Days w/ poor A.Q. for sensitive groups | 7 |
| Days with unhealthy air quality | 4 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Valdez, AK | 3,865 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Ridgecrest, FL | 3,865 | 43 | 14.0% |
| Eastland, TX | 3,865 | 33 | 34.0% |
| Claresholm, AB | 3,865 | n/a | |
| Raymond, AB | 3,865 | n/a | |
| Hopkinton, MA | 3,864 | 40 | 20.0% |
| Valdez, AK | 3,865 | 31 | 38.0% |
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