| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 45°F | 39°F | 11.2" |
| February | 33°F | 49°F | 40°F | 7.8" |
| March | 36°F | 53°F | 43°F | 10.6" |
| April | 36°F | 58°F | 46°F | 5.7" |
| May | 43°F | 66°F | 53°F | 6.9" |
| June | 48°F | 71°F | 58°F | 3.4" |
| July | 51°F | 79°F | 63°F | 1.7" |
| August | 51°F | 79°F | 63°F | 3.3" |
| September | 48°F | 72°F | 59°F | 5.5" |
| October | 42°F | 60°F | 50°F | 9.7" |
| November | 37°F | 50°F | 43°F | 13.1" |
| December | 32°F | 43°F | 37°F | 12.4" |
| Index | Belfair | Washington | National |
| Air quality index | 18 | 36 | 42 |
| Pollution index | 1,081,430 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 340 |
| Days with good air quality | 338 |
| Days with moderate air quality | 2 |
| 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 | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Maplewood, WA | 5,135 | 18 | 64.0% |
| Enetai, WA | 1,993 | 18 | 64.0% |
| Allyn, WA | 2,504 | 18 | 64.0% |
| Grapeview, WA | 703 | 18 | 64.0% |
| Navy Yard City, WA | 2,973 | 18 | 64.0% |
| Belfair, WA | 4,557 | 18 | 64.0% |
| City | Population | Air Quality Index | National Avg. |
| Sunnyside, CA | 4,557 | 60 | 20.0% |
| Luverne, MN | 4,557 | 36 | 28.0% |
| Vilonia, AR | 4,556 | 45 | 10.0% |
| Kings Park, VA | 4,556 | 47 | 6.0% |
| Castle Pines Village, CO | 4,558 | 58 | 16.0% |
| Belfair, WA | 4,557 | 18 | 64.0% |
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