| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 46°F | 39°F | 4.4" |
| February | 36°F | 52°F | 43°F | 4.5" |
| March | 40°F | 60°F | 49°F | 6.7" |
| April | 42°F | 61°F | 51°F | 4.9" |
| May | 48°F | 70°F | 58°F | 4.0" |
| June | 51°F | 72°F | 61°F | 4.2" |
| July | 57°F | 84°F | 69°F | 1.7" |
| August | 54°F | 84°F | 67°F | 5.0" |
| September | 48°F | 75°F | 60°F | 3.9" |
| October | 47°F | 63°F | 54°F | 5.4" |
| November | 38°F | 51°F | 44°F | 8.4" |
| December | 35°F | 45°F | 39°F | 11.5" |
| Index | Troutdale | Oregon | National |
| Air quality index | 38 | 32 | 42 |
| Pollution index | 24,235,400 | 7,156,356 | 2,726,193 |
| 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 | 0.020% |
| Benzene | 0.250% |
| Carbon Tetrachloride | 0.060% |
| Lead | 0.160% |
| Mercury | 0.090% |
| City | Population | Air Quality Index | National Avg. |
| Maywood Park, OR | 1,224 | 38 | 24.0% |
| Fern Prairie, WA | 1,989 | 38 | 24.0% |
| Washougal, WA | 15,927 | 38 | 24.0% |
| Milwaukie, OR | 21,086 | 38 | 24.0% |
| Sandy, OR | 11,319 | 38 | 24.0% |
| Troutdale, OR | 16,433 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Wahiawa, HI | 16,442 | 30 | 40.0% |
| Streetsboro, OH | 16,444 | 43 | 14.0% |
| Palmetto Estates, FL | 16,419 | 41 | 18.0% |
| Hazel Park, MI | 16,452 | 56 | 12.0% |
| Buffalo, MN | 16,413 | 32 | 36.0% |
| Troutdale, OR | 16,433 | 38 | 24.0% |
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