| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -4°F | 11°F | 3°F | 2.1" |
| February | -1°F | 18°F | 7°F | 1.6" |
| March | 3°F | 28°F | 14°F | 1.1" |
| April | 23°F | 50°F | 38°F | 1.2" |
| May | 37°F | 61°F | 51°F | 4.0" |
| June | 46°F | 72°F | 61°F | 1.6" |
| July | 47°F | 69°F | 59°F | 4.5" |
| August | 42°F | 69°F | 55°F | 6.2" |
| September | 37°F | 56°F | 46°F | 3.9" |
| October | 24°F | 39°F | 31°F | 1.5" |
| November | 4°F | 18°F | 10°F | 2.8" |
| December | 0°F | 12°F | 5°F | 3.5" |
| Index | McCarthy | 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. |
| McCarthy, AK | 0 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Chase, AK | 0 | 31 | 38.0% |
| Chiniak, AK | 0 | 31 | 38.0% |
| Chisana, AK | 0 | 31 | 38.0% |
| Dot Lake, AK | 0 | 38 | 24.0% |
| Eureka Roadhouse, AK | 0 | 31 | 38.0% |
| McCarthy, AK | 0 | 31 | 38.0% |
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