Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 19°F | 28°F | 23°F | 4.8" |
February | 19°F | 30°F | 24°F | 4.6" |
March | 23°F | 34°F | 27°F | 6.5" |
April | 27°F | 41°F | 32°F | 3.4" |
May | 35°F | 52°F | 42°F | 2.7" |
June | 42°F | 60°F | 49°F | 3.5" |
July | 53°F | 72°F | 61°F | 1.0" |
August | 51°F | 71°F | 59°F | 1.0" |
September | 44°F | 61°F | 50°F | 1.6" |
October | 32°F | 45°F | 37°F | 4.2" |
November | 23°F | 33°F | 27°F | 6.4" |
December | 16°F | 25°F | 21°F | 6.1" |
Index | Plains | Montana | National |
Air quality index | 40 | 34 | 42 |
Pollution index | 1,107,360 | 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 | 0.001% |
Benzene | 0.010% |
Carbon Tetrachloride | 0.000% |
Lead | 0.004% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Hot Springs, MT | 627 | 37 | 26.0% |
Weeksville, MT | 86 | 37 | 26.0% |
Camas, MT | 89 | 37 | 26.0% |
St. Regis, MT | 207 | 40 | 20.0% |
Paradise, MT | 114 | 40 | 20.0% |
Plains, MT | 1,019 | 40 | 20.0% |
City | Population | Air Quality Index | National Avg. |
Leroy, AL | 1,019 | 42 | 16.0% |
Hebron, MD | 1,019 | 36 | 28.0% |
New Salem, ND | 1,019 | 36 | 28.0% |
Cochranton, PA | 1,019 | 31 | 38.0% |
Gilbert Creek, WV | 1,019 | 295 | 490.0% |
Plains, MT | 1,019 | 40 | 20.0% |