| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -17°F | 4°F | -7°F | 1.3" |
| February | -8°F | 17°F | 3°F | 0.8" |
| March | -6°F | 24°F | 10°F | 0.5" |
| April | 18°F | 44°F | 32°F | 0.6" |
| May | 35°F | 62°F | 49°F | 0.8" |
| June | 46°F | 70°F | 58°F | 1.8" |
| July | 50°F | 71°F | 60°F | 2.5" |
| August | 46°F | 66°F | 55°F | 3.0" |
| September | 37°F | 56°F | 46°F | 2.8" |
| October | 22°F | 38°F | 30°F | 1.9" |
| November | -2°F | 16°F | 7°F | 1.5" |
| December | -10°F | 10°F | 0°F | 1.5" |
| Index | McGrath | Alaska | National |
| Air quality index | 31 | 30 | 42 |
| Pollution index | 131,850 | 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 | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.040% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| McGrath, AK | 231 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Carthage, AR | 231 | 32 | 36.0% |
| Homeland, FL | 231 | 36 | 28.0% |
| Lambs Grove, IA | 231 | 39 | 22.0% |
| Ulen, IN | 231 | 54 | 8.0% |
| Dent, MN | 231 | 33 | 34.0% |
| McGrath, AK | 231 | 31 | 38.0% |
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