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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 43°F | 34°F | 1.0" |
| February | 28°F | 50°F | 38°F | 0.7" |
| March | 33°F | 60°F | 46°F | 1.0" |
| April | 37°F | 67°F | 52°F | 0.8" |
| May | 44°F | 77°F | 61°F | 1.0" |
| June | 52°F | 84°F | 68°F | 0.8" |
| July | 58°F | 94°F | 76°F | 0.1" |
| August | 56°F | 92°F | 74°F | 0.2" |
| September | 47°F | 82°F | 64°F | 0.4" |
| October | 39°F | 67°F | 52°F | 1.0" |
| November | 32°F | 52°F | 41°F | 1.0" |
| December | 25°F | 41°F | 32°F | 1.2" |
| Index | Arlington | Oregon | National |
| Air quality index | 23 | 32 | 42 |
| Pollution index | 1,258,680 | 7,156,356 | 2,726,193 |
| Measurement | Total |
| Days measured | 350 |
| Days with good air quality | 298 |
| Days with moderate air quality | 52 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Roosevelt, WA | 108 | 23 | 54.0% |
| Arlington, OR | 445 | 23 | 54.0% |
| City | Population | Air Quality Index | National Avg. |
| Caldwell, AR | 445 | 45 | 10.0% |
| Fort Thomas, AZ | 445 | 47 | 6.0% |
| Sugar City, CO | 445 | 20 | 60.0% |
| Fenwick Island, DE | 445 | 36 | 28.0% |
| Norway, IA | 445 | 39 | 22.0% |
| Arlington, OR | 445 | 23 | 54.0% |
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