| 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 | Downtown | Boise | Idaho |
| Air quality index | 36 | 36 | 32 |
| Pollution index | 886,004 | 886,004 | 2,063,710 |
| 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. |
| Star, ID | 9,819 | 36 | 28.0% |
| Robie Creek, ID | 1,380 | 36 | 28.0% |
| Eagle, ID | 28,145 | 36 | 28.0% |
| Kuna, ID | 20,985 | 36 | 28.0% |
| Garden City, ID | 11,873 | 36 | 28.0% |
| Boise, ID | 228,057 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Richmond, VA | 229,233 | 44 | 12.0% |
| Windsor, ON | 230,583 | n/a | |
| Richmond, BC | 222,489 | n/a | |
| Hialeah, FL | 233,876 | 41 | 18.0% |
| Baton Rouge, LA | 222,191 | 45 | 10.0% |
| Boise, ID | 228,057 | 36 | 28.0% |
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