| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -7°F | 7°F | -0°F | 3.1" |
| February | -4°F | 16°F | 4°F | 1.4" |
| March | -3°F | 19°F | 8°F | 1.4" |
| April | 27°F | 45°F | 36°F | 2.8" |
| May | 42°F | 60°F | 51°F | 3.8" |
| June | 51°F | 67°F | 59°F | 10.5" |
| July | 53°F | 69°F | 61°F | 4.7" |
| August | 48°F | 67°F | 57°F | 2.7" |
| September | 41°F | 53°F | 46°F | 3.6" |
| October | 17°F | 29°F | 23°F | 1.7" |
| November | 2°F | 15°F | 8°F | 1.8" |
| December | 3°F | 18°F | 11°F | 1.4" |
| Index | Ferry | Alaska | National |
| Air quality index | 38 | 30 | 50 |
| Pollution index | 131,850 | 11,990,286 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 230 |
| Days with moderate air quality | 96 |
| Days w/ poor A.Q. for sensitive groups | 18 |
| Days with unhealthy air quality | 16 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.040% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Larson, ND | 6 | 34 | 32% |
| Lowry, SD | 6 | 20 | 60% |
| Rentchler, IL | 6 | 54 | 8% |
| Westerville, NE | 6 | 19 | 62% |
| Valdez, CO | 6 | 15 | 70% |
| Ferry, AK | 6 | 38 | 24% |
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