| 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 | Kennewick | Washington | National |
| Air quality index | 37 | 36 | 42 |
| Pollution index | 697,942 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 303 |
| Days with moderate air quality | 62 |
| 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. |
| Richland, WA | 57,353 | 37 | 26.0% |
| Wallula, WA | 151 | 37 | 26.0% |
| Benton City, WA | 3,422 | 37 | 26.0% |
| West Pasco, WA | 1,592 | 37 | 26.0% |
| Burbank, WA | 3,522 | 37 | 26.0% |
| Kennewick, WA | 82,633 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Sioux City, IA | 82,535 | 35 | 30.0% |
| Chino Hills, CA | 82,800 | 89 | 78.0% |
| New Westminster, BC | 82,940 | n/a | |
| Melbourne, FL | 82,281 | 36 | 28.0% |
| Buena Park, CA | 82,228 | 72 | 44.0% |
| Kennewick, WA | 82,633 | 37 | 26.0% |
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