| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 35°F | 29°F | 4.1" |
| February | 24°F | 35°F | 29°F | 1.4" |
| March | 27°F | 39°F | 33°F | 2.1" |
| April | 32°F | 49°F | 40°F | 1.8" |
| May | 40°F | 56°F | 47°F | 1.6" |
| June | 47°F | 64°F | 54°F | 3.0" |
| July | 52°F | 64°F | 57°F | 5.0" |
| August | 51°F | 66°F | 57°F | 3.0" |
| September | 47°F | 58°F | 52°F | 3.7" |
| October | 37°F | 49°F | 43°F | 5.0" |
| November | 32°F | 42°F | 37°F | 10.9" |
| December | 26°F | 38°F | 32°F | 2.4" |
| Index | Gustavus | Alaska | National |
| Air quality index | 20 | 30 | 42 |
| Pollution index | 231,160 | 11,243,194 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 308 |
| Days with moderate air quality | 51 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Excursion Inlet, AK | 36 | 20 | 60.0% |
| Gustavus, AK | 493 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Clarkedale, AR | 493 | 45 | 10.0% |
| Round Valley, CA | 493 | 47 | 6.0% |
| Micanopy, FL | 493 | 35 | 30.0% |
| Keyesport, IL | 493 | 43 | 14.0% |
| Woodson, IL | 493 | 40 | 20.0% |
| Gustavus, AK | 493 | 20 | 60.0% |
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