| 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 | 29 | 30 | 50 |
| Pollution index | 749,334 | 11,990,286 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 284 |
| Days with moderate air quality | 76 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| McCarthy, AK | 28 | 29 | 42% |
| City, State | Population | Air Quality Index | National Avg. |
| Bankston, IA | 28 | 32 | 36% |
| Jardine, MT | 28 | 24 | 52% |
| Upper Elochoman, WA | 28 | 22 | 56% |
| Egeland, ND | 28 | 34 | 32% |
| Ginger Blue, MO | 28 | 37 | 26% |
| McCarthy, AK | 28 | 29 | 42% |