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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 49°F | 42°F | 15.0" |
| February | 35°F | 51°F | 43°F | 9.3" |
| March | 36°F | 53°F | 44°F | 15.6" |
| April | 38°F | 56°F | 47°F | 8.4" |
| May | 43°F | 62°F | 52°F | 4.3" |
| June | 47°F | 65°F | 56°F | 3.3" |
| July | 51°F | 69°F | 59°F | 1.9" |
| August | 51°F | 72°F | 60°F | 1.9" |
| September | 47°F | 69°F | 57°F | 5.5" |
| October | 42°F | 61°F | 51°F | 11.2" |
| November | 38°F | 53°F | 45°F | 16.6" |
| December | 34°F | 48°F | 40°F | 13.1" |
| Index | Forks | Washington | National |
| Air quality index | 34 | 36 | 42 |
| Pollution index | 480,925 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 341 |
| Days with moderate air quality | 24 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.040% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Forks, WA | 3,864 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Hopkinton, MA | 3,864 | 40 | 20.0% |
| Carefree, AZ | 3,863 | 74 | 48.0% |
| Valdez, AK | 3,865 | 31 | 38.0% |
| Ridgecrest, FL | 3,865 | 43 | 14.0% |
| Eastland, TX | 3,865 | 33 | 34.0% |
| Forks, WA | 3,864 | 34 | 32.0% |