| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 48°F | 41°F | 7.8" |
| February | 37°F | 53°F | 44°F | 4.4" |
| March | 40°F | 58°F | 47°F | 5.7" |
| April | 41°F | 64°F | 51°F | 3.3" |
| May | 46°F | 73°F | 57°F | 3.5" |
| June | 51°F | 78°F | 62°F | 1.9" |
| July | 54°F | 86°F | 68°F | 3.3" |
| August | 54°F | 86°F | 68°F | 2.1" |
| September | 49°F | 80°F | 63°F | 3.4" |
| October | 44°F | 67°F | 54°F | 5.6" |
| November | 40°F | 55°F | 46°F | 5.4" |
| December | 35°F | 47°F | 40°F | 7.2" |
| Index | Sweet Home | Oregon | National |
| Air quality index | 28 | 32 | 42 |
| Pollution index | 77,038 | 7,156,356 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 280 |
| Days with moderate air quality | 83 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Crawfordsville, OR | 441 | 28 | 44.0% |
| Lebanon, OR | 17,144 | 28 | 44.0% |
| Holley, OR | 368 | 28 | 44.0% |
| South Lebanon, OR | 903 | 28 | 44.0% |
| Brownsville, OR | 2,139 | 28 | 44.0% |
| Sweet Home, OR | 9,763 | 28 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Mount Vista, WA | 9,762 | 38 | 24.0% |
| Fort Stewart, GA | 9,765 | 39 | 22.0% |
| Ingleside, TX | 9,768 | 42 | 16.0% |
| Sugar Grove, IL | 9,756 | 0 | 100.0% |
| Rifle, CO | 9,771 | 44 | 12.0% |
| Sweet Home, OR | 9,763 | 28 | 44.0% |
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