| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 38°F | 31°F | 2.0" |
| February | 29°F | 43°F | 35°F | 1.6" |
| March | 33°F | 51°F | 40°F | 2.9" |
| April | 36°F | 58°F | 46°F | 1.8" |
| May | 42°F | 68°F | 54°F | 1.6" |
| June | 47°F | 75°F | 61°F | 1.4" |
| July | 50°F | 86°F | 69°F | 0.3" |
| August | 50°F | 86°F | 68°F | 0.4" |
| September | 44°F | 77°F | 60°F | 0.7" |
| October | 38°F | 61°F | 48°F | 1.8" |
| November | 32°F | 46°F | 39°F | 2.6" |
| December | 24°F | 36°F | 30°F | 2.5" |
| Index | Princeton | Idaho | National |
| Air quality index | 10 | 32 | 50 |
| Pollution index | 1,107,360 | 2,232,285 | 5,066,862 |
| Measurement | Total |
| Days measured | 350 |
| Days with good air quality | 350 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Onaway, ID | 172 | 10 | 80% |
| Potlatch, ID | 835 | 10 | 80% |
| Palouse, WA | 1,048 | 10 | 80% |
| Deary, ID | 393 | 10 | 80% |
| Troy, ID | 888 | 10 | 80% |
| Princeton, ID | 76 | 10 | 80% |
| City, State | Population | Air Quality Index | National Avg. |
| Riverton, NE | 76 | 19 | 62% |
| Claire City, SD | 76 | 25 | 50% |
| Red Dog Mine, AK | 76 | 38 | 24% |
| Tamora, NE | 76 | 31 | 38% |
| Dixon, NE | 76 | 35 | 30% |
| Princeton, ID | 76 | 10 | 80% |
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