| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 42°F | 34°F | 1.0" |
| February | 29°F | 51°F | 38°F | 0.6" |
| March | 34°F | 61°F | 47°F | 0.8" |
| April | 38°F | 68°F | 53°F | 0.6" |
| May | 45°F | 79°F | 62°F | 0.9" |
| June | 53°F | 85°F | 69°F | 0.8" |
| July | 58°F | 95°F | 77°F | 0.2" |
| August | 56°F | 93°F | 74°F | 0.2" |
| September | 47°F | 83°F | 64°F | 0.3" |
| October | 40°F | 67°F | 52°F | 0.8" |
| November | 32°F | 52°F | 41°F | 0.8" |
| December | 25°F | 41°F | 32°F | 1.1" |
| Index | Kahlotus | Washington | National |
| Air quality index | 23 | 36 | 42 |
| Pollution index | 697,942 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 318 |
| Days with moderate air quality | 47 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Hatton, WA | 453 | 18 | 64.0% |
| Washtucna, WA | 176 | 23 | 54.0% |
| Connell, WA | 5,518 | 37 | 26.0% |
| Kahlotus, WA | 144 | 23 | 54.0% |
| City | Population | Air Quality Index | National Avg. |
| Rye, AR | 144 | 35 | 30.0% |
| West Point, AR | 144 | 45 | 10.0% |
| Bellville, GA | 144 | 39 | 22.0% |
| Clare, IA | 144 | 37 | 26.0% |
| Delaware, IA | 144 | 39 | 22.0% |
| Kahlotus, WA | 144 | 23 | 54.0% |
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