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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 48°F | 40°F | 4.9" |
| February | 36°F | 53°F | 43°F | 3.4" |
| March | 39°F | 58°F | 48°F | 4.8" |
| April | 42°F | 63°F | 52°F | 3.0" |
| May | 48°F | 71°F | 58°F | 2.8" |
| June | 53°F | 76°F | 63°F | 1.7" |
| July | 57°F | 84°F | 69°F | 0.5" |
| August | 58°F | 85°F | 70°F | 0.5" |
| September | 53°F | 78°F | 64°F | 1.8" |
| October | 47°F | 66°F | 55°F | 3.7" |
| November | 40°F | 55°F | 47°F | 6.2" |
| December | 34°F | 47°F | 40°F | 6.2" |
| Index | Historic Milwaukie | Milwaukie | Oregon |
| Air quality index | 38 | 38 | 32 |
| Pollution index | 11,541,100 | 11,541,100 | 7,156,356 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 285 |
| Days with moderate air quality | 77 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.140% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Troutdale, OR | 17,015 | 38 | 24.0% |
| Washougal, WA | 16,351 | 38 | 24.0% |
| Garden Home-Whitford, OR | 7,521 | 38 | 24.0% |
| Lake Oswego, OR | 40,335 | 38 | 24.0% |
| Raleigh Hills, OR | 6,812 | 38 | 24.0% |
| Milwaukie, OR | 21,853 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Fort St. John, BC | 21,858 | n/a | |
| Sapulpa, OK | 21,843 | 45 | 10.0% |
| Sanford, ME | 21,841 | 40 | 20.0% |
| Arnold, MO | 21,866 | 54 | 8.0% |
| Kings, Subd. A, NS | 21,831 | n/a | |
| Milwaukie, OR | 21,853 | 38 | 24.0% |
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