Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 19°F | 31°F | 25°F | 1.6" |
February | 21°F | 35°F | 27°F | 1.3" |
March | 26°F | 46°F | 36°F | 2.5" |
April | 30°F | 55°F | 43°F | 2.4" |
May | 37°F | 64°F | 51°F | 4.2" |
June | 45°F | 71°F | 59°F | 3.0" |
July | 50°F | 85°F | 68°F | 4.1" |
August | 46°F | 82°F | 65°F | 4.6" |
September | 40°F | 73°F | 57°F | 6.3" |
October | 33°F | 55°F | 44°F | 3.0" |
November | 24°F | 39°F | 31°F | 2.0" |
December | 15°F | 28°F | 21°F | 1.8" |
Index | Charlos Heights | Montana | National |
Air quality index | 40 | 34 | 42 |
Pollution index | 848,303 | 834,473 | 2,726,193 |
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. |
Corvallis, MT | 1,755 | 40 | 20.0% |
Darby, MT | 685 | 40 | 20.0% |
Hamilton, MT | 4,827 | 40 | 20.0% |
Conner, MT | 95 | 40 | 20.0% |
Pinesdale, MT | 999 | 40 | 20.0% |
Charlos Heights, MT | 0 | 40 | 20.0% |
City | Population | Air Quality Index | National Avg. |
Chase, AK | 0 | 31 | 38.0% |
Chiniak, AK | 0 | 31 | 38.0% |
Chisana, AK | 0 | 31 | 38.0% |
Dot Lake, AK | 0 | 38 | 24.0% |
Eureka Roadhouse, AK | 0 | 31 | 38.0% |
Charlos Heights, MT | 0 | 40 | 20.0% |