| 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 | Farmington | Washington | National |
| Air quality index | 10 | 36 | 42 |
| Pollution index | 2,233,350 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 350 |
| Days with good air quality | 350 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.003% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| De Smet, ID | 160 | 10 | 80.0% |
| Onaway, ID | 205 | 10 | 80.0% |
| Tensed, ID | 68 | 10 | 80.0% |
| Potlatch, ID | 836 | 10 | 80.0% |
| Palouse, WA | 969 | 10 | 80.0% |
| Farmington, WA | 142 | 10 | 80.0% |
| City | Population | Air Quality Index | National Avg. |
| Golovin, AK | 142 | 38 | 24.0% |
| Kaibab, AZ | 142 | 44 | 12.0% |
| Alpine Village, CA | 142 | 13 | 74.0% |
| Bluewater, CA | 142 | 13 | 74.0% |
| Comptche, CA | 142 | 33 | 34.0% |
| Farmington, WA | 142 | 10 | 80.0% |
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