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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 34°F | 25°F | 2.1" |
| February | 23°F | 43°F | 32°F | 2.1" |
| March | 28°F | 53°F | 40°F | 3.9" |
| April | 32°F | 60°F | 46°F | 1.7" |
| May | 40°F | 69°F | 54°F | 3.0" |
| June | 43°F | 74°F | 59°F | 4.4" |
| July | 48°F | 88°F | 69°F | 3.2" |
| August | 46°F | 86°F | 66°F | 1.9" |
| September | 36°F | 74°F | 54°F | 1.7" |
| October | 33°F | 59°F | 45°F | 3.6" |
| November | 25°F | 41°F | 33°F | 4.2" |
| December | 18°F | 32°F | 25°F | 5.4" |
| Index | Oldtown | Idaho | National |
| Air quality index | 43 | 32 | 42 |
| Pollution index | 2,800,290 | 2,063,710 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 252 |
| Days with moderate air quality | 111 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Priest River, ID | 1,855 | 43 | 14.0% |
| Cusick, WA | 80 | 43 | 14.0% |
| Newport, WA | 2,082 | 43 | 14.0% |
| Blanchard, ID | 230 | 43 | 14.0% |
| Oldtown, ID | 332 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Eldorado Springs, CO | 332 | 47 | 6.0% |
| Silver City, IA | 332 | 40 | 20.0% |
| Winslow, IL | 332 | 29 | 42.0% |
| Montpelier, LA | 332 | 30 | 40.0% |
| Rosemont, MD | 332 | 40 | 20.0% |
| Oldtown, ID | 332 | 43 | 14.0% |
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