| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 49°F | 41°F | 5.6" |
| February | 35°F | 53°F | 43°F | 4.1" |
| March | 37°F | 58°F | 47°F | 5.4" |
| April | 39°F | 63°F | 50°F | 2.9" |
| May | 45°F | 71°F | 57°F | 2.3" |
| June | 50°F | 76°F | 62°F | 1.3" |
| July | 54°F | 86°F | 69°F | 0.3" |
| August | 54°F | 86°F | 69°F | 0.4" |
| September | 50°F | 80°F | 63°F | 1.8" |
| October | 43°F | 66°F | 54°F | 4.1" |
| November | 38°F | 55°F | 46°F | 6.7" |
| December | 33°F | 48°F | 40°F | 7.4" |
| Index | Silverton | Oregon | National |
| Air quality index | 32 | 32 | 42 |
| Pollution index | 11,541,100 | 7,156,356 | 2,726,193 |
| Measurement | Total |
| Days measured | 356 |
| Days with good air quality | 302 |
| Days with moderate air quality | 54 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| St. Paul, OR | 396 | 32 | 36.0% |
| Mehama, OR | 396 | 32 | 36.0% |
| Four Corners, OR | 16,491 | 32 | 36.0% |
| Brooks, OR | 621 | 32 | 36.0% |
| Keizer, OR | 39,408 | 32 | 36.0% |
| Silverton, OR | 10,426 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Union City, TN | 10,426 | 26 | 48.0% |
| Newcastle, OK | 10,425 | 48 | 4.0% |
| Del Aire, CA | 10,424 | 72 | 44.0% |
| Sugarmill Woods, FL | 10,424 | 30 | 40.0% |
| Little Canada, MN | 10,423 | 46 | 8.0% |
| Silverton, OR | 10,426 | 32 | 36.0% |
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