| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 51°F | 42°F | 4.6" |
| February | 38°F | 56°F | 45°F | 3.7" |
| March | 40°F | 60°F | 48°F | 4.4" |
| April | 42°F | 65°F | 52°F | 2.5" |
| May | 48°F | 74°F | 59°F | 2.0" |
| June | 53°F | 79°F | 64°F | 1.0" |
| July | 57°F | 88°F | 71°F | 0.3" |
| August | 57°F | 89°F | 71°F | 0.2" |
| September | 52°F | 83°F | 65°F | 0.9" |
| October | 46°F | 69°F | 55°F | 2.8" |
| November | 41°F | 56°F | 47°F | 5.0" |
| December | 36°F | 49°F | 41°F | 6.3" |
| Index | Elkton | Oregon | National |
| Air quality index | 24 | 32 | 42 |
| Pollution index | 3,310,060 | 7,156,356 | 2,726,193 |
| Measurement | Total |
| Days measured | 347 |
| Days with good air quality | 288 |
| Days with moderate air quality | 59 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.020% |
| Mercury | 0.005% |
| City | Population | Air Quality Index | National Avg. |
| Oakland, OR | 1,071 | 24 | 52.0% |
| Yoncalla, OR | 1,166 | 24 | 52.0% |
| Drain, OR | 955 | 38 | 24.0% |
| Elkton, OR | 162 | 24 | 52.0% |
| City | Population | Air Quality Index | National Avg. |
| Beatrice, AL | 162 | 52 | 4.0% |
| Chapin, IA | 162 | 15 | 70.0% |
| Colburn, IN | 162 | 42 | 16.0% |
| Tampa, KS | 162 | 22 | 56.0% |
| Nebo, KY | 162 | 43 | 14.0% |
| Elkton, OR | 162 | 24 | 52.0% |
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