| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 6°F | 22°F | 13°F | 1.0" |
| February | 11°F | 30°F | 20°F | 0.9" |
| March | 11°F | 34°F | 22°F | 1.2" |
| April | 26°F | 45°F | 36°F | 0.7" |
| May | 35°F | 56°F | 46°F | 1.6" |
| June | 43°F | 62°F | 52°F | 2.0" |
| July | 48°F | 65°F | 56°F | 2.8" |
| August | 47°F | 63°F | 55°F | 3.1" |
| September | 40°F | 57°F | 48°F | 3.7" |
| October | 29°F | 45°F | 36°F | 2.1" |
| November | 14°F | 30°F | 21°F | 1.9" |
| December | 10°F | 24°F | 17°F | 1.2" |
| Index | Sterling | Alaska | National |
| Air quality index | 31 | 30 | 42 |
| Pollution index | 2,169,570 | 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 | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ridgeway, AK | 2,631 | 31 | 38.0% |
| Soldotna, AK | 4,705 | 31 | 38.0% |
| Funny River, AK | 1,340 | 31 | 38.0% |
| Kenai, AK | 7,799 | 31 | 38.0% |
| Sterling, AK | 5,150 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Johnstown, OH | 5,149 | 46 | 8.0% |
| Lanoraie, QC | 5,148 | n/a | |
| Colchester, CT | 5,147 | 33 | 34.0% |
| Massac, KY | 5,154 | 44 | 12.0% |
| Silver Hill, MD | 5,155 | 47 | 6.0% |
| Sterling, AK | 5,150 | 31 | 38.0% |
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