| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 51°F | 43°F | 10.5" |
| February | 37°F | 53°F | 44°F | 6.7" |
| March | 39°F | 55°F | 46°F | 9.5" |
| April | 40°F | 57°F | 49°F | 6.0" |
| May | 45°F | 63°F | 53°F | 4.1" |
| June | 50°F | 66°F | 57°F | 2.4" |
| July | 53°F | 69°F | 60°F | 1.0" |
| August | 53°F | 71°F | 61°F | 0.8" |
| September | 50°F | 70°F | 59°F | 3.3" |
| October | 45°F | 63°F | 53°F | 7.4" |
| November | 40°F | 55°F | 47°F | 12.7" |
| December | 36°F | 49°F | 42°F | 11.3" |
| Index | Warrenton | Oregon | National |
| Air quality index | 18 | 32 | 42 |
| Pollution index | 1,735,090 | 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 | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Seaside, OR | 6,811 | 18 | 64.0% |
| Deep River, WA | 169 | 18 | 64.0% |
| Altoona, WA | 35 | 18 | 64.0% |
| Astoria, OR | 9,929 | 18 | 64.0% |
| Rosburg, WA | 320 | 18 | 64.0% |
| Warrenton, OR | 5,635 | 18 | 64.0% |
| City | Population | Air Quality Index | National Avg. |
| Addis, LA | 5,635 | 45 | 10.0% |
| Kayenta, AZ | 5,634 | 49 | 2.0% |
| Paola, KS | 5,634 | 47 | 6.0% |
| Sioux Lookout, ON | 5,634 | n/a | |
| Campbelltown, PA | 5,632 | 42 | 16.0% |
| Warrenton, OR | 5,635 | 18 | 64.0% |
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