Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 12°F | 30°F | 20°F | 1.5" |
February | 10°F | 28°F | 18°F | 1.2" |
March | 21°F | 45°F | 31°F | 2.1" |
April | 30°F | 56°F | 42°F | 1.3" |
May | 37°F | 63°F | 50°F | 5.0" |
June | 46°F | 74°F | 59°F | 3.2" |
July | 52°F | 84°F | 68°F | 2.0" |
August | 51°F | 82°F | 66°F | 0.9" |
September | 42°F | 69°F | 54°F | 7.8" |
October | 35°F | 59°F | 45°F | 2.5" |
November | 22°F | 42°F | 31°F | 1.5" |
December | 12°F | 30°F | 21°F | 1.3" |
Index | Simms | Montana | National |
Air quality index | 21 | 34 | 42 |
Pollution index | 1,148,190 | 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 | 0.020% |
Carbon Tetrachloride | 0.002% |
Lead | 0.010% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Fort Shaw, MT | 138 | 21 | 58.0% |
Sun River, MT | 41 | 21 | 58.0% |
Fairfield, MT | 690 | 21 | 58.0% |
Simms, MT | 338 | 21 | 58.0% |
City | Population | Air Quality Index | National Avg. |
Northway, AK | 338 | 38 | 24.0% |
Tununak, AK | 338 | 31 | 38.0% |
St. Charles, AR | 338 | 43 | 14.0% |
Strawberry, AR | 338 | 45 | 10.0% |
Winkelman, AZ | 338 | 47 | 6.0% |
Simms, MT | 338 | 21 | 58.0% |