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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 32°F | 20°F | 0.7" |
| February | 16°F | 39°F | 26°F | 0.6" |
| March | 24°F | 49°F | 35°F | 1.3" |
| April | 30°F | 58°F | 42°F | 1.1" |
| May | 38°F | 67°F | 51°F | 2.1" |
| June | 45°F | 77°F | 60°F | 2.3" |
| July | 52°F | 90°F | 71°F | 1.3" |
| August | 48°F | 87°F | 66°F | 1.4" |
| September | 41°F | 77°F | 57°F | 2.0" |
| October | 31°F | 60°F | 43°F | 1.8" |
| November | 22°F | 45°F | 32°F | 1.3" |
| December | 11°F | 31°F | 19°F | 1.2" |
| Index | Challis | Idaho | National |
| Air quality index | 36 | 32 | 42 |
| Pollution index | 2,239,880 | 2,063,710 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 293 |
| Days with moderate air quality | 60 |
| Days w/ poor A.Q. for sensitive groups | 9 |
| Days with unhealthy air quality | 3 |
| 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. |
| Challis, ID | 761 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Manokotak, AK | 761 | 31 | 38.0% |
| Independence, CA | 761 | 47 | 6.0% |
| Duck Key, FL | 761 | 41 | 18.0% |
| Ventura, IA | 761 | 15 | 70.0% |
| Mount Hope, KS | 761 | 40 | 20.0% |
| Challis, ID | 761 | 36 | 28.0% |