| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 35°F | 29°F | 7.3" |
| February | 26°F | 44°F | 34°F | 3.1" |
| March | 33°F | 55°F | 44°F | 0.7" |
| April | 38°F | 65°F | 51°F | 0.9" |
| May | 46°F | 76°F | 61°F | 1.6" |
| June | 54°F | 81°F | 67°F | 2.1" |
| July | 59°F | 91°F | 75°F | 1.4" |
| August | 57°F | 89°F | 72°F | 1.3" |
| September | 49°F | 77°F | 62°F | 1.3" |
| October | 40°F | 62°F | 51°F | 1.0" |
| November | 32°F | 46°F | 39°F | 1.3" |
| December | 23°F | 34°F | 29°F | 5.5" |
| Index | Oroville | Washington | National |
| Air quality index | 24 | 36 | 42 |
| Pollution index | 422,626 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 298 |
| Days with moderate air quality | 66 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Loomis, WA | 101 | 24 | 52.0% |
| Oroville, WA | 1,842 | 24 | 52.0% |
| City | Population | Air Quality Index | National Avg. |
| North Corbin, KY | 1,842 | 40 | 20.0% |
| South Paris, ME | 1,842 | 31 | 38.0% |
| Groton, SD | 1,842 | 20 | 60.0% |
| Fort Hancock, TX | 1,842 | 53 | 6.0% |
| Inukjuak, QC | 1,842 | n/a | |
| Oroville, WA | 1,842 | 24 | 52.0% |
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