| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 39°F | 33°F | 2.3" |
| February | 30°F | 48°F | 38°F | 1.2" |
| March | 35°F | 56°F | 46°F | 1.7" |
| April | 41°F | 65°F | 53°F | 1.6" |
| May | 49°F | 75°F | 62°F | 1.4" |
| June | 56°F | 83°F | 69°F | 2.8" |
| July | 64°F | 93°F | 79°F | 0.7" |
| August | 61°F | 92°F | 77°F | 1.0" |
| September | 53°F | 82°F | 68°F | 1.2" |
| October | 42°F | 64°F | 53°F | 2.1" |
| November | 33°F | 49°F | 41°F | 1.3" |
| December | 25°F | 37°F | 31°F | 1.8" |
| Index | Othello | Washington | National |
| Air quality index | 18 | 36 | 42 |
| Pollution index | 2,683,410 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 339 |
| Days with moderate air quality | 26 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.030% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Warden, WA | 2,773 | 18 | 64.0% |
| Othello, WA | 8,241 | 18 | 64.0% |
| City | Population | Air Quality Index | National Avg. |
| Cheviot, OH | 8,241 | 54 | 8.0% |
| Bryan, OH | 8,243 | 39 | 22.0% |
| Trail, BC | 8,243 | n/a | |
| Sainte-Brigitte-de-Laval, QC | 8,238 | n/a | |
| Seffner, FL | 8,236 | 43 | 14.0% |
| Othello, WA | 8,241 | 18 | 64.0% |
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