| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 39°F | 30°F | 1.3" |
| February | 28°F | 48°F | 37°F | 0.9" |
| March | 34°F | 58°F | 45°F | 1.5" |
| April | 37°F | 65°F | 51°F | 1.2" |
| May | 45°F | 75°F | 60°F | 1.2" |
| June | 53°F | 85°F | 69°F | 0.8" |
| July | 62°F | 97°F | 79°F | 0.2" |
| August | 60°F | 93°F | 77°F | 0.3" |
| September | 52°F | 83°F | 67°F | 0.5" |
| October | 41°F | 68°F | 53°F | 1.0" |
| November | 32°F | 52°F | 41°F | 1.3" |
| December | 23°F | 39°F | 31°F | 1.9" |
| Index | Placerville | Idaho | National |
| Air quality index | 36 | 32 | 42 |
| Pollution index | 886,004 | 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 | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Idaho City, ID | 706 | 36 | 28.0% |
| Banks, ID | 6 | 36 | 28.0% |
| Horseshoe Bend, ID | 839 | 36 | 28.0% |
| Crouch, ID | 145 | 36 | 28.0% |
| Garden Valley, ID | 475 | 36 | 28.0% |
| Placerville, ID | 55 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Dayton, AL | 55 | 36 | 28.0% |
| Minturn, AR | 55 | 45 | 10.0% |
| Hayesville, IA | 55 | 35 | 30.0% |
| Nodaway, IA | 55 | 40 | 20.0% |
| Thornburg, IA | 55 | 35 | 30.0% |
| Placerville, ID | 55 | 36 | 28.0% |
Here are the best places to live in Idaho
Check out the 10 safest cities in Idaho
These are the 10 most affordable cities in Idaho
10 Best cities in Idaho for employment