| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 39°F | 28°F | 0.4" |
| February | 18°F | 40°F | 29°F | 0.3" |
| March | 26°F | 52°F | 38°F | 0.3" |
| April | 33°F | 59°F | 45°F | 1.7" |
| May | 41°F | 68°F | 54°F | 2.9" |
| June | 49°F | 77°F | 63°F | 2.6" |
| July | 55°F | 89°F | 72°F | 1.4" |
| August | 54°F | 86°F | 70°F | 1.5" |
| September | 46°F | 76°F | 60°F | 2.0" |
| October | 37°F | 61°F | 48°F | 1.3" |
| November | 26°F | 48°F | 36°F | 0.5" |
| December | 15°F | 36°F | 26°F | 0.4" |
| Index | Carter | Montana | National |
| Air quality index | 21 | 34 | 42 |
| Pollution index | 250,374 | 834,473 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 350 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Highwood, MT | 229 | 21 | 58.0% |
| Fort Benton, MT | 1,410 | 21 | 58.0% |
| Carter, MT | 99 | 21 | 58.0% |
| City | Population | Air Quality Index | National Avg. |
| Cullomburg, AL | 99 | 36 | 28.0% |
| Faunsdale, AL | 99 | 35 | 30.0% |
| Black Springs, AR | 99 | 38 | 24.0% |
| Tumacacori-Carmen, AZ | 99 | 31 | 38.0% |
| Alleghany, CA | 99 | 44 | 12.0% |
| Carter, MT | 99 | 21 | 58.0% |
Here are the best places to live in Montana
These are the 10 cheapest cities in Montana
Check out the 10 safest cities in Montana
See the best places to live in Carter