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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 28°F | 19°F | 3.0" |
| February | 19°F | 37°F | 27°F | 1.1" |
| March | 27°F | 51°F | 37°F | 2.1" |
| April | 32°F | 59°F | 44°F | 4.7" |
| May | 39°F | 68°F | 53°F | 3.1" |
| June | 46°F | 77°F | 61°F | 4.1" |
| July | 51°F | 88°F | 70°F | 2.1" |
| August | 48°F | 85°F | 66°F | 2.5" |
| September | 41°F | 75°F | 56°F | 3.5" |
| October | 32°F | 58°F | 43°F | 2.7" |
| November | 23°F | 44°F | 32°F | 1.3" |
| December | 13°F | 29°F | 20°F | 1.2" |
| Index | Salmon | Idaho | National |
| Air quality index | 20 | 32 | 42 |
| Pollution index | 2,239,880 | 2,063,710 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 319 |
| Days with moderate air quality | 44 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Salmon, ID | 3,135 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Bethany, MO | 3,135 | 43 | 14.0% |
| Waynesville, OH | 3,135 | 43 | 14.0% |
| San Saba, TX | 3,134 | 42 | 16.0% |
| Athens, ON | 3,134 | n/a | |
| Woodside, PA | 3,133 | 41 | 18.0% |
| Salmon, ID | 3,135 | 20 | 60.0% |
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