| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 24°F | 16°F | 0.8" |
| February | 13°F | 30°F | 21°F | 0.7" |
| March | 16°F | 34°F | 25°F | 0.5" |
| April | 29°F | 48°F | 39°F | 0.3" |
| May | 38°F | 61°F | 50°F | 0.4" |
| June | 46°F | 66°F | 56°F | 1.0" |
| July | 50°F | 69°F | 58°F | 1.6" |
| August | 48°F | 66°F | 56°F | 2.1" |
| September | 41°F | 57°F | 48°F | 2.1" |
| October | 29°F | 45°F | 36°F | 0.9" |
| November | 13°F | 28°F | 20°F | 0.6" |
| December | 11°F | 26°F | 18°F | 0.8" |
| Index | Gateway | Alaska | National |
| Air quality index | 31 | 30 | 42 |
| Pollution index | 7,145,440 | 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 | 0.030% |
| Benzene | 0.130% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.140% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Buffalo Soapstone, AK | 937 | 31 | 38.0% |
| Knik River, AK | 807 | 31 | 38.0% |
| Knik-Fairview, AK | 17,682 | 31 | 38.0% |
| Butte, AK | 3,888 | 31 | 38.0% |
| Lakes, AK | 8,944 | 31 | 38.0% |
| Gateway, AK | 5,965 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Fountainhead-Orchard Hills, MD | 5,964 | 40 | 20.0% |
| Steelton, PA | 5,964 | 44 | 12.0% |
| Saint-Henri, QC | 5,964 | n/a | |
| Cocoa West, FL | 5,966 | 36 | 28.0% |
| Rib Mountain, WI | 5,963 | 34 | 32.0% |
| Gateway, AK | 5,965 | 31 | 38.0% |
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