| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 36°F | 29°F | 0.9" |
| February | 26°F | 46°F | 35°F | 0.6" |
| March | 32°F | 57°F | 44°F | 0.9" |
| April | 37°F | 65°F | 51°F | 0.6" |
| May | 45°F | 76°F | 61°F | 0.7" |
| June | 52°F | 82°F | 68°F | 0.9" |
| July | 58°F | 92°F | 76°F | 0.2" |
| August | 55°F | 91°F | 74°F | 0.1" |
| September | 47°F | 81°F | 64°F | 0.3" |
| October | 38°F | 65°F | 50°F | 0.9" |
| November | 29°F | 48°F | 38°F | 0.9" |
| December | 21°F | 36°F | 28°F | 1.2" |
| Index | Wilbur | 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. |
| Grand Coulee, WA | 1,257 | 18 | 64.0% |
| Almira, WA | 267 | 18 | 64.0% |
| Coulee Dam, WA | 1,355 | 18 | 64.0% |
| Creston, WA | 240 | 43 | 14.0% |
| Wilbur, WA | 767 | 18 | 64.0% |
| City | Population | Air Quality Index | National Avg. |
| Illiopolis, IL | 767 | 44 | 12.0% |
| Ravenna, KY | 767 | 33 | 34.0% |
| Midway, LA | 767 | 30 | 40.0% |
| Kimball, MN | 767 | 32 | 36.0% |
| Middleville, NY | 767 | 27 | 46.0% |
| Wilbur, WA | 767 | 18 | 64.0% |
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