Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 14°F | 36°F | 25°F | 0.6" |
February | 15°F | 38°F | 25°F | 0.5" |
March | 24°F | 48°F | 34°F | 0.8" |
April | 29°F | 55°F | 41°F | 2.0" |
May | 37°F | 64°F | 50°F | 3.5" |
June | 45°F | 73°F | 59°F | 3.4" |
July | 52°F | 85°F | 69°F | 1.5" |
August | 50°F | 83°F | 66°F | 1.8" |
September | 42°F | 73°F | 56°F | 1.5" |
October | 33°F | 59°F | 44°F | 1.7" |
November | 22°F | 46°F | 33°F | 0.8" |
December | 12°F | 34°F | 23°F | 0.5" |
Index | Lewistown | Montana | National |
Air quality index | 21 | 34 | 42 |
Pollution index | 263,666 | 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 | 0.005% |
Carbon Tetrachloride | 0.001% |
Lead | 0.010% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Lewistown Heights, MT | 312 | 21 | 58.0% |
Moore, MT | 187 | 21 | 58.0% |
Lewistown, MT | 5,923 | 21 | 58.0% |
City | Population | Air Quality Index | National Avg. |
Selinsgrove, PA | 5,923 | 35 | 30.0% |
Woods Creek, WA | 5,922 | 45 | 10.0% |
Old Tappan, NJ | 5,924 | 51 | 2.0% |
Margate City, NJ | 5,921 | 37 | 26.0% |
Oxford, MA | 5,926 | 40 | 20.0% |
Lewistown, MT | 5,923 | 21 | 58.0% |