| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 33°F | 28°F | 2.7" |
| February | 26°F | 39°F | 32°F | 2.0" |
| March | 31°F | 49°F | 39°F | 4.0" |
| April | 35°F | 57°F | 45°F | 2.0" |
| May | 43°F | 68°F | 55°F | 2.5" |
| June | 49°F | 75°F | 61°F | 3.3" |
| July | 56°F | 86°F | 71°F | 1.4" |
| August | 55°F | 85°F | 70°F | 1.8" |
| September | 47°F | 75°F | 60°F | 2.1" |
| October | 38°F | 58°F | 47°F | 3.8" |
| November | 30°F | 43°F | 36°F | 2.7" |
| December | 22°F | 32°F | 27°F | 3.1" |
| Index | Reardan | Washington | National |
| Air quality index | 43 | 36 | 42 |
| Pollution index | 2,233,350 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 252 |
| Days with moderate air quality | 111 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.003% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Fairchild AFB, WA | 3,464 | 43 | 14.0% |
| Davenport, WA | 1,852 | 43 | 14.0% |
| Four Lakes, WA | 515 | 43 | 14.0% |
| Airway Heights, WA | 8,885 | 43 | 14.0% |
| Medical Lake, WA | 4,950 | 43 | 14.0% |
| Reardan, WA | 471 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Declo, ID | 471 | 20 | 60.0% |
| Ashley, IL | 471 | 43 | 14.0% |
| Fowler, KS | 471 | 15 | 70.0% |
| Sedalia, NC | 471 | 31 | 38.0% |
| Forman, ND | 471 | 20 | 60.0% |
| Reardan, WA | 471 | 43 | 14.0% |
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