| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 40°F | 31°F | 1.0" |
| February | 26°F | 44°F | 34°F | 1.4" |
| March | 31°F | 53°F | 40°F | 3.4" |
| April | 33°F | 57°F | 44°F | 1.9" |
| May | 39°F | 67°F | 52°F | 2.8" |
| June | 44°F | 72°F | 57°F | 5.3" |
| July | 52°F | 87°F | 69°F | 1.2" |
| August | 50°F | 88°F | 69°F | 2.8" |
| September | 45°F | 80°F | 61°F | 3.8" |
| October | 36°F | 60°F | 47°F | 2.4" |
| November | 29°F | 47°F | 37°F | 2.0" |
| December | 24°F | 37°F | 30°F | 1.6" |
| Index | Kooskia | Idaho | National |
| Air quality index | 29 | 32 | 42 |
| Pollution index | 3,385,410 | 2,063,710 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 291 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.040% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Nezperce, ID | 528 | 29 | 42.0% |
| Stites, ID | 172 | 29 | 42.0% |
| Grangeville, ID | 3,195 | 29 | 42.0% |
| Kamiah, ID | 1,334 | 29 | 42.0% |
| Kooskia, ID | 578 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Fort Jones, CA | 578 | 36 | 28.0% |
| Morley, MI | 578 | 38 | 24.0% |
| Franklin, MN | 578 | 32 | 36.0% |
| Shoal Creek Drive, MO | 578 | 37 | 26.0% |
| Caswell Beach, NC | 578 | 34 | 32.0% |
| Kooskia, ID | 578 | 29 | 42.0% |
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