| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 57°F | 45°F | 3.6" |
| February | 39°F | 60°F | 48°F | 3.5" |
| March | 47°F | 69°F | 57°F | 4.7" |
| April | 54°F | 77°F | 65°F | 5.1" |
| May | 62°F | 83°F | 72°F | 5.0" |
| June | 70°F | 91°F | 80°F | 3.0" |
| July | 73°F | 94°F | 82°F | 4.1" |
| August | 73°F | 94°F | 82°F | 3.1" |
| September | 65°F | 88°F | 76°F | 4.3" |
| October | 54°F | 78°F | 65°F | 4.2" |
| November | 46°F | 67°F | 55°F | 3.7" |
| December | 38°F | 58°F | 47°F | 4.8" |
| Index | Washington | Arkansas | National |
| Air quality index | 39 | 38 | 42 |
| Pollution index | 537,821 | 1,487,822 | 2,726,193 |
| Measurement | Total |
| Days measured | 349 |
| Days with good air quality | 254 |
| Days with moderate air quality | 94 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| McCaskill, AR | 73 | 32 | 36.0% |
| Emmet, AR | 444 | 32 | 36.0% |
| Blevins, AR | 396 | 32 | 36.0% |
| McNab, AR | 113 | 39 | 22.0% |
| Tollette, AR | 212 | 39 | 22.0% |
| Washington, AR | 134 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Hindsville, AR | 134 | 44 | 12.0% |
| Moorefield, AR | 134 | 45 | 10.0% |
| Mead Ranch, AZ | 134 | 60 | 20.0% |
| Tupman, CA | 134 | 67 | 34.0% |
| Brick Center, CO | 134 | 58 | 16.0% |
| Washington, AR | 134 | 39 | 22.0% |
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