| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 33°F | 20°F | 0.4" |
| February | 12°F | 37°F | 23°F | 0.4" |
| March | 20°F | 44°F | 31°F | 0.6" |
| April | 26°F | 52°F | 38°F | 1.4" |
| May | 34°F | 62°F | 47°F | 2.2" |
| June | 41°F | 71°F | 55°F | 2.8" |
| July | 46°F | 84°F | 65°F | 1.0" |
| August | 43°F | 80°F | 61°F | 1.2" |
| September | 36°F | 71°F | 52°F | 1.3" |
| October | 28°F | 54°F | 39°F | 1.4" |
| November | 19°F | 42°F | 30°F | 0.5" |
| December | 7°F | 29°F | 17°F | 0.5" |
| Index | Anaconda-Deer Lodge County | Montana | National |
| Air quality index | 20 | 34 | 42 |
| Pollution index | 568,053 | 834,473 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 319 |
| Days with moderate air quality | 44 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Butte-Silver Bow, MT | 34,263 | 20 | 60.0% |
| Anaconda-Deer Lodge County, MT | 9,153 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Greenville, NY | 9,155 | 51 | 2.0% |
| Calimesa, CA | 9,156 | 89 | 78.0% |
| Derby, CO | 9,156 | 58 | 16.0% |
| Gresham Park, GA | 9,148 | 52 | 4.0% |
| Lake Mohawk, NJ | 9,148 | 34 | 32.0% |
| Anaconda-Deer Lodge County, MT | 9,153 | 20 | 60.0% |
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