| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 37°F | 30°F | 2.8" |
| February | 28°F | 46°F | 35°F | 2.1" |
| March | 34°F | 54°F | 43°F | 2.0" |
| April | 36°F | 59°F | 47°F | 1.8" |
| May | 43°F | 69°F | 55°F | 2.0" |
| June | 46°F | 73°F | 59°F | 2.0" |
| July | 51°F | 88°F | 70°F | 0.9" |
| August | 48°F | 86°F | 67°F | 1.2" |
| September | 41°F | 73°F | 56°F | 1.4" |
| October | 39°F | 61°F | 49°F | 2.4" |
| November | 31°F | 45°F | 37°F | 2.7" |
| December | 24°F | 35°F | 30°F | 2.9" |
| Index | Pullman | Washington | National |
| Air quality index | 18 | 36 | 42 |
| Pollution index | 1,232,200 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 354 |
| Days with moderate air quality | 11 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Moscow, ID | 25,652 | 10 | 80.0% |
| Onaway, ID | 205 | 10 | 80.0% |
| Potlatch, ID | 836 | 10 | 80.0% |
| Palouse, WA | 969 | 10 | 80.0% |
| Colfax, WA | 2,879 | 18 | 64.0% |
| Pullman, WA | 33,974 | 18 | 64.0% |
| City | Population | Air Quality Index | National Avg. |
| Merritt Island, FL | 33,975 | 36 | 28.0% |
| Salisbury, NC | 33,961 | 40 | 20.0% |
| North Ridgeville, OH | 33,961 | 50 | = 100 |
| Sun Prairie, WI | 33,954 | 39 | 22.0% |
| Cookeville, TN | 33,922 | 25 | 50.0% |
| Pullman, WA | 33,974 | 18 | 64.0% |
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