| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 29°F | 21°F | 2.7" |
| February | 15°F | 33°F | 24°F | 1.9" |
| March | 23°F | 42°F | 33°F | 2.3" |
| April | 30°F | 54°F | 43°F | 3.1" |
| May | 37°F | 63°F | 52°F | 3.6" |
| June | 45°F | 76°F | 63°F | 3.3" |
| July | 53°F | 86°F | 74°F | 1.0" |
| August | 49°F | 84°F | 70°F | 1.7" |
| September | 40°F | 74°F | 60°F | 3.8" |
| October | 32°F | 57°F | 45°F | 2.8" |
| November | 23°F | 43°F | 34°F | 2.2" |
| December | 16°F | 31°F | 23°F | 1.5" |
| Index | Bancroft | Idaho | National |
| Air quality index | 27 | 32 | 42 |
| Pollution index | 881,525 | 2,063,710 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 344 |
| Days with moderate air quality | 21 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Arimo, ID | 326 | 27 | 46.0% |
| Lava Hot Springs, ID | 253 | 27 | 46.0% |
| Grace, ID | 1,266 | 27 | 46.0% |
| Bancroft, ID | 309 | 27 | 46.0% |
| City | Population | Air Quality Index | National Avg. |
| Dillon Beach, CA | 309 | 34 | 32.0% |
| Esto, FL | 309 | 35 | 30.0% |
| Martelle, IA | 309 | 39 | 22.0% |
| Hollister, ID | 309 | 20 | 60.0% |
| Newport, IN | 309 | 45 | 10.0% |
| Bancroft, ID | 309 | 27 | 46.0% |
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