| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 33°F | 27°F | 12.2" |
| February | 26°F | 35°F | 30°F | 7.2" |
| March | 29°F | 39°F | 33°F | 11.1" |
| April | 32°F | 46°F | 37°F | 6.3" |
| May | 39°F | 55°F | 45°F | 5.8" |
| June | 43°F | 60°F | 49°F | 4.4" |
| July | 49°F | 70°F | 57°F | 1.2" |
| August | 51°F | 70°F | 58°F | 1.5" |
| September | 46°F | 63°F | 52°F | 4.1" |
| October | 38°F | 50°F | 42°F | 9.1" |
| November | 30°F | 37°F | 33°F | 14.5" |
| December | 23°F | 31°F | 26°F | 12.2" |
| Index | Greenwater | Washington | National |
| Air quality index | 45 | 36 | 42 |
| Pollution index | 17,693,800 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 236 |
| Days with moderate air quality | 127 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.300% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.110% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Greenwater, WA | 77 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Bon Air, AL | 77 | 38 | 24.0% |
| Ward, CO | 77 | 47 | 6.0% |
| Altoona, FL | 77 | 37 | 26.0% |
| Lone Oak, GA | 77 | 42 | 16.0% |
| Sharon, GA | 77 | 44 | 12.0% |
| Greenwater, WA | 77 | 45 | 10.0% |
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