| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 34°F | 25°F | 0.9" |
| February | 21°F | 40°F | 30°F | 1.0" |
| March | 26°F | 51°F | 38°F | 1.0" |
| April | 31°F | 60°F | 44°F | 1.1" |
| May | 38°F | 69°F | 53°F | 1.4" |
| June | 45°F | 78°F | 61°F | 2.0" |
| July | 51°F | 91°F | 71°F | 0.6" |
| August | 49°F | 88°F | 68°F | 0.7" |
| September | 42°F | 77°F | 58°F | 1.0" |
| October | 33°F | 59°F | 45°F | 1.2" |
| November | 24°F | 44°F | 33°F | 1.4" |
| December | 15°F | 32°F | 24°F | 1.2" |
| Index | Grant Creek | Missoula | Montana |
| Air quality index | 40 | 40 | 34 |
| Pollution index | 848,303 | 848,303 | 834,473 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 224 |
| Days with moderate air quality | 137 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Lolo, MT | 4,064 | 40 | 20.0% |
| Frenchtown, MT | 1,741 | 40 | 20.0% |
| Turah, MT | 309 | 40 | 20.0% |
| Bonner-West Riverside, MT | 1,404 | 40 | 20.0% |
| Huson, MT | 60 | 40 | 20.0% |
| Missoula, MT | 74,994 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Union City, CA | 75,067 | 43 | 14.0% |
| Arlington Heights, IL | 75,071 | 55 | 10.0% |
| Milpitas, CA | 75,182 | 43 | 14.0% |
| Missouri City, TX | 75,348 | 52 | 4.0% |
| St. Joseph, MO | 75,369 | 43 | 14.0% |
| Missoula, MT | 74,994 | 40 | 20.0% |
Here are the best places to live in Montana
Most Dangerous States In The US
These are the largest cities in Montana
Check out the 10 most dangerous cities in Montana