| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -9°F | 6°F | -2°F | 1.8" |
| February | -5°F | 16°F | 6°F | 1.6" |
| March | -3°F | 23°F | 11°F | 1.6" |
| April | 19°F | 39°F | 31°F | 0.9" |
| May | 37°F | 54°F | 47°F | 1.6" |
| June | 47°F | 62°F | 54°F | 3.3" |
| July | 49°F | 64°F | 57°F | 3.1" |
| August | 44°F | 60°F | 52°F | 3.6" |
| September | 34°F | 53°F | 44°F | 2.9" |
| October | 19°F | 35°F | 27°F | 2.2" |
| November | 2°F | 17°F | 10°F | 1.4" |
| December | -6°F | 10°F | 2°F | 1.4" |
| Index | Cantwell | Alaska | National |
| Air quality index | 38 | 30 | 42 |
| Pollution index | 131,850 | 11,243,194 | 2,726,193 |
| 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 | Population | Air Quality Index | National Avg. |
| Cantwell, AK | 210 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Shungnak, AK | 210 | 38 | 24.0% |
| White Hills, AZ | 210 | 54 | 8.0% |
| Monson, CA | 210 | 66 | 32.0% |
| Point Reyes Station, CA | 210 | 34 | 32.0% |
| Parnell, IA | 210 | 35 | 30.0% |
| Cantwell, AK | 210 | 38 | 24.0% |
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