| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 32°F | 26°F | 3.9" |
| February | 23°F | 34°F | 28°F | 3.4" |
| March | 22°F | 35°F | 28°F | 1.9" |
| April | 30°F | 43°F | 36°F | 2.8" |
| May | 37°F | 53°F | 44°F | 1.2" |
| June | 43°F | 58°F | 50°F | 1.2" |
| July | 48°F | 62°F | 55°F | 1.6" |
| August | 48°F | 61°F | 54°F | 2.6" |
| September | 43°F | 56°F | 49°F | 4.2" |
| October | 34°F | 47°F | 40°F | 4.0" |
| November | 26°F | 36°F | 31°F | 4.1" |
| December | 24°F | 34°F | 28°F | 4.6" |
| Index | Nanwalek | Alaska | National |
| Air quality index | 31 | 30 | 42 |
| Pollution index | 2,169,570 | 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 | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Port Graham, AK | 150 | 31 | 38.0% |
| Seldovia, AK | 164 | 31 | 38.0% |
| Seldovia Village, AK | 175 | 31 | 38.0% |
| Nanwalek, AK | 213 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Sweet Water, AL | 213 | 36 | 28.0% |
| Ruth, CA | 213 | 42 | 16.0% |
| Westside, CA | 213 | 72 | 44.0% |
| Rye, CO | 213 | 20 | 60.0% |
| Sunny Side, GA | 213 | 52 | 4.0% |
| Nanwalek, AK | 213 | 31 | 38.0% |
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