| 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 | 50 |
| Pollution index | 881,525 | 2,232,285 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Lava Hot Springs, ID | 344 | 27 | 46% |
| Grace, ID | 893 | 27 | 46% |
| Arimo, ID | 361 | 27 | 46% |
| Bancroft, ID | 381 | 27 | 46% |
| City, State | Population | Air Quality Index | National Avg. |
| Holland Patent, NY | 381 | 27 | 46% |
| Bivalve, MD | 381 | 41 | 18% |
| Tribbey, OK | 381 | 36 | 28% |
| Spring Lake, UT | 381 | 46 | 8% |
| Wasco, OR | 381 | 23 | 54% |
| Bancroft, ID | 381 | 27 | 46% |
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