| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 35°F | 29°F | 0.7" |
| February | 26°F | 45°F | 35°F | 0.6" |
| March | 32°F | 57°F | 44°F | 1.1" |
| April | 38°F | 65°F | 52°F | 0.8" |
| May | 47°F | 76°F | 62°F | 0.7" |
| June | 54°F | 83°F | 69°F | 0.8" |
| July | 61°F | 92°F | 77°F | 0.2" |
| August | 60°F | 91°F | 76°F | 0.2" |
| September | 50°F | 81°F | 65°F | 0.3" |
| October | 40°F | 65°F | 52°F | 0.9" |
| November | 29°F | 48°F | 38°F | 0.8" |
| December | 22°F | 37°F | 30°F | 0.9" |
| Index | George | Washington | National |
| Air quality index | 18 | 36 | 42 |
| Pollution index | 2,683,410 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 339 |
| Days with moderate air quality | 26 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.030% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Royal City, WA | 2,384 | 18 | 64.0% |
| Vantage, WA | 0 | 23 | 54.0% |
| Quincy, WA | 7,815 | 24 | 52.0% |
| George, WA | 823 | 18 | 64.0% |
| City | Population | Air Quality Index | National Avg. |
| Weiner, AR | 823 | 45 | 10.0% |
| Patagonia, AZ | 823 | 31 | 38.0% |
| Council, ID | 823 | 36 | 28.0% |
| Brookport, IL | 823 | 44 | 12.0% |
| Hollow Creek, KY | 823 | 49 | 2.0% |
| George, WA | 823 | 18 | 64.0% |
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