Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 24°F | 35°F | 29°F | 4.1" |
February | 26°F | 40°F | 32°F | 2.4" |
March | 31°F | 49°F | 39°F | 3.4" |
April | 36°F | 58°F | 45°F | 2.8" |
May | 43°F | 69°F | 55°F | 2.9" |
June | 50°F | 75°F | 61°F | 6.5" |
July | 55°F | 87°F | 70°F | 3.1" |
August | 54°F | 86°F | 69°F | 3.1" |
September | 47°F | 76°F | 60°F | 2.9" |
October | 38°F | 59°F | 47°F | 4.0" |
November | 31°F | 44°F | 37°F | 3.4" |
December | 23°F | 34°F | 28°F | 3.9" |
Index | Heron | Montana | National |
Air quality index | 43 | 34 | 42 |
Pollution index | 4,670,990 | 834,473 | 2,726,193 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 252 |
Days with moderate air quality | 111 |
Days w/ poor A.Q. for sensitive groups | 2 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.050% |
Benzene | 0.060% |
Carbon Tetrachloride | 0.010% |
Lead | 0.060% |
Mercury | 0.003% |
City | Population | Air Quality Index | National Avg. |
Noxon, MT | 162 | 37 | 26.0% |
East Hope, ID | 168 | 43 | 14.0% |
Hope, ID | 97 | 43 | 14.0% |
Clark Fork, ID | 849 | 43 | 14.0% |
Heron, MT | 281 | 43 | 14.0% |
City | Population | Air Quality Index | National Avg. |
Copper Center, AK | 281 | 31 | 38.0% |
Madrid, AL | 281 | 35 | 30.0% |
Carl, GA | 281 | 37 | 26.0% |
Jewett, IL | 281 | 40 | 20.0% |
Lisbon, IL | 281 | 0 | 100.0% |
Heron, MT | 281 | 43 | 14.0% |