| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -2°F | 10°F | 4°F | 0.4" |
| February | 1°F | 14°F | 7°F | 0.7" |
| March | 3°F | 18°F | 10°F | 14.7" |
| April | 18°F | 34°F | 26°F | 2.0" |
| May | 32°F | 50°F | 40°F | 1.6" |
| June | 40°F | 59°F | 48°F | 2.7" |
| July | 44°F | 61°F | 51°F | 4.7" |
| August | 42°F | 58°F | 48°F | 1.4" |
| September | 34°F | 49°F | 40°F | 2.2" |
| October | 21°F | 32°F | 26°F | 1.4" |
| November | 3°F | 14°F | 8°F | 1.1" |
| December | -1°F | 11°F | 5°F | 0.9" |
| Index | Nelchina | 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. |
| Eureka Roadhouse, AK | 0 | 31 | 38.0% |
| Mendeltna, AK | 25 | 31 | 38.0% |
| Nelchina, AK | 230 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Friendship, AR | 230 | 32 | 36.0% |
| Riggins, ID | 230 | 29 | 42.0% |
| Coleta, IL | 230 | 42 | 16.0% |
| Tennyson, IN | 230 | 43 | 14.0% |
| South Carrollton, KY | 230 | 43 | 14.0% |
| Nelchina, AK | 230 | 31 | 38.0% |
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