| 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 | Curlew | Washington | National |
| Air quality index | 43 | 36 | 42 |
| Pollution index | 2,800,290 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 252 |
| Days with moderate air quality | 111 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Torboy, WA | 154 | 43 | 14.0% |
| Danville, WA | 70 | 43 | 14.0% |
| Curlew Lake, WA | 579 | 43 | 14.0% |
| Malo, WA | 45 | 43 | 14.0% |
| Curlew, WA | 51 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Egegik, AK | 51 | 31 | 38.0% |
| Big Flat, AR | 51 | 36 | 28.0% |
| Felsenthal, AR | 51 | 35 | 30.0% |
| McDougal, AR | 51 | 26 | 48.0% |
| Padre Ranchitos, AZ | 51 | 45 | 10.0% |
| Curlew, WA | 51 | 43 | 14.0% |
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