| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 47°F | 39°F | 4.8" |
| February | 34°F | 52°F | 42°F | 3.8" |
| March | 37°F | 56°F | 46°F | 4.5" |
| April | 39°F | 62°F | 50°F | 2.5" |
| May | 44°F | 70°F | 56°F | 2.1" |
| June | 49°F | 75°F | 61°F | 1.3" |
| July | 52°F | 84°F | 67°F | 0.3" |
| August | 52°F | 85°F | 68°F | 0.4" |
| September | 48°F | 78°F | 62°F | 1.4" |
| October | 42°F | 65°F | 52°F | 3.6" |
| November | 37°F | 53°F | 45°F | 5.8" |
| December | 32°F | 45°F | 38°F | 6.0" |
| Index | Rockcreek | Oregon | National |
| Air quality index | 38 | 32 | 42 |
| Pollution index | 15,149,900 | 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 | 0.010% |
| Benzene | 0.160% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.080% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| West Slope, OR | 6,799 | 38 | 24.0% |
| Rivergrove, OR | 604 | 38 | 24.0% |
| West Linn, OR | 26,764 | 38 | 24.0% |
| Aloha, OR | 53,724 | 38 | 24.0% |
| Oak Hills, OR | 11,682 | 38 | 24.0% |
| Rockcreek, OR | 9,698 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Keansburg, NJ | 9,697 | 51 | 2.0% |
| Villas, NJ | 9,697 | 40 | 20.0% |
| Decatur, IN | 9,700 | 45 | 10.0% |
| Marysville, MI | 9,695 | 56 | 12.0% |
| Croydon, PA | 9,693 | 41 | 18.0% |
| Rockcreek, OR | 9,698 | 38 | 24.0% |
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