| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 47°F | 40°F | 8.3" |
| February | 36°F | 52°F | 42°F | 5.4" |
| March | 40°F | 56°F | 46°F | 6.0" |
| April | 41°F | 62°F | 50°F | 4.8" |
| May | 47°F | 69°F | 56°F | 5.7" |
| June | 52°F | 73°F | 60°F | 3.6" |
| July | 55°F | 80°F | 65°F | 2.1" |
| August | 55°F | 81°F | 66°F | 2.8" |
| September | 51°F | 75°F | 61°F | 5.1" |
| October | 46°F | 63°F | 53°F | 6.4" |
| November | 40°F | 52°F | 45°F | 8.2" |
| December | 35°F | 45°F | 39°F | 8.9" |
| Index | Westport | Oregon | National |
| Air quality index | 18 | 32 | 42 |
| Pollution index | 4,215,410 | 7,156,356 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 338 |
| Days with moderate air quality | 22 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.005% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.030% |
| Mercury | 0.250% |
| City | Population | Air Quality Index | National Avg. |
| Clatskanie, OR | 2,189 | 18 | 64.0% |
| Lower Elochoman, WA | 475 | 18 | 64.0% |
| Upper Elochoman, WA | 119 | 18 | 64.0% |
| Altoona, WA | 35 | 18 | 64.0% |
| Puget Island, WA | 1,227 | 18 | 64.0% |
| Westport, OR | 329 | 18 | 64.0% |
| City | Population | Air Quality Index | National Avg. |
| Maysville, AR | 329 | 44 | 12.0% |
| Lake Almanor West, CA | 329 | 46 | 8.0% |
| Russellville, IN | 329 | 45 | 10.0% |
| Grainfield, KS | 329 | 15 | 70.0% |
| Clarence, LA | 329 | 30 | 40.0% |
| Westport, OR | 329 | 18 | 64.0% |
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