| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 54°F | 46°F | 7.9" |
| February | 41°F | 55°F | 47°F | 6.5" |
| March | 42°F | 56°F | 48°F | 8.3" |
| April | 43°F | 57°F | 49°F | 4.6" |
| May | 48°F | 61°F | 53°F | 2.7" |
| June | 51°F | 64°F | 57°F | 1.7" |
| July | 53°F | 66°F | 59°F | 0.8" |
| August | 53°F | 67°F | 59°F | 0.4" |
| September | 51°F | 67°F | 58°F | 1.4" |
| October | 48°F | 63°F | 54°F | 4.8" |
| November | 44°F | 58°F | 49°F | 8.8" |
| December | 39°F | 53°F | 45°F | 9.7" |
| Index | Dunes City | Oregon | National |
| Air quality index | 19 | 32 | 42 |
| Pollution index | 3,310,060 | 7,156,356 | 2,726,193 |
| Measurement | Total |
| Days measured | 107 |
| Days with good air quality | 106 |
| Days with moderate air quality | 1 |
| 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. |
| Winchester Bay, OR | 319 | 19 | 62.0% |
| Florence, OR | 9,037 | 19 | 62.0% |
| Gardiner, OR | 466 | 19 | 62.0% |
| Reedsport, OR | 4,085 | 19 | 62.0% |
| Dunes City, OR | 1,208 | 19 | 62.0% |
| City | Population | Air Quality Index | National Avg. |
| Six Shooter Canyon, AZ | 1,208 | 60 | 20.0% |
| Chebanse, IL | 1,208 | 0 | 100.0% |
| Energy, IL | 1,208 | 43 | 14.0% |
| Valmeyer, IL | 1,208 | 54 | 8.0% |
| Warren, IL | 1,208 | 29 | 42.0% |
| Dunes City, OR | 1,208 | 19 | 62.0% |
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