| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 30°F | 21°F | 3.3" |
| February | 12°F | 33°F | 22°F | 2.4" |
| March | 19°F | 39°F | 29°F | 4.1" |
| April | 25°F | 48°F | 35°F | 3.1" |
| May | 33°F | 60°F | 46°F | 3.3" |
| June | 40°F | 69°F | 54°F | 4.5" |
| July | 46°F | 83°F | 65°F | 1.1" |
| August | 43°F | 81°F | 62°F | 1.5" |
| September | 36°F | 72°F | 53°F | 2.5" |
| October | 29°F | 55°F | 40°F | 3.7" |
| November | 21°F | 40°F | 30°F | 3.9" |
| December | 13°F | 29°F | 21°F | 4.6" |
| Index | Cascade | Idaho | National |
| Air quality index | 36 | 32 | 42 |
| Pollution index | 1,490,030 | 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 | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Smiths Ferry, ID | 108 | 36 | 28.0% |
| Donnelly, ID | 153 | 36 | 28.0% |
| Cascade, ID | 899 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Hopland, CA | 899 | 33 | 34.0% |
| McCloud, CA | 899 | 42 | 16.0% |
| Stonington, CT | 899 | 37 | 26.0% |
| Hazelton, ID | 899 | 20 | 60.0% |
| Teton, ID | 899 | 43 | 14.0% |
| Cascade, ID | 899 | 36 | 28.0% |
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