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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 39°F | 27°F | 0.4" |
| February | 21°F | 43°F | 30°F | 0.5" |
| March | 32°F | 58°F | 43°F | 1.2" |
| April | 42°F | 67°F | 53°F | 3.2" |
| May | 52°F | 77°F | 63°F | 4.3" |
| June | 63°F | 87°F | 74°F | 4.1" |
| July | 67°F | 90°F | 78°F | 2.6" |
| August | 64°F | 87°F | 74°F | 4.0" |
| September | 55°F | 81°F | 66°F | 2.0" |
| October | 43°F | 69°F | 54°F | 2.3" |
| November | 31°F | 55°F | 41°F | 0.9" |
| December | 20°F | 40°F | 29°F | 0.7" |
| Index | Washington | Kansas | National |
| Air quality index | 32 | 47 | 42 |
| Pollution index | 81,192 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 95 |
| Days with good air quality | 94 |
| Days with moderate air quality | 1 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hollenberg, KS | 23 | 32 | 36.0% |
| Greenleaf, KS | 324 | 32 | 36.0% |
| Palmer, KS | 134 | 32 | 36.0% |
| Linn, KS | 428 | 32 | 36.0% |
| Haddam, KS | 150 | 32 | 36.0% |
| Washington, KS | 993 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Hughes, AR | 993 | 45 | 10.0% |
| Castle Hayne, NC | 993 | 34 | 32.0% |
| Rhodhiss, NC | 993 | 43 | 14.0% |
| Saddle Rock, NY | 993 | 51 | 2.0% |
| Cresson, TX | 993 | 33 | 34.0% |
| Washington, KS | 993 | 32 | 36.0% |