Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 12°F | 29°F | 20°F | 2.3" |
February | 10°F | 30°F | 20°F | 1.4" |
March | 19°F | 42°F | 30°F | 2.1" |
April | 30°F | 57°F | 43°F | 3.5" |
May | 42°F | 70°F | 56°F | 3.2" |
June | 51°F | 79°F | 65°F | 3.9" |
July | 55°F | 82°F | 69°F | 2.9" |
August | 53°F | 80°F | 67°F | 3.0" |
September | 46°F | 73°F | 59°F | 2.8" |
October | 37°F | 60°F | 48°F | 3.1" |
November | 28°F | 46°F | 37°F | 2.2" |
December | 18°F | 33°F | 26°F | 2.2" |
Index | St. Helen | Michigan | National |
Air quality index | 36 | 69 | 42 |
Pollution index | 2,149,790 | 4,161,606 | 2,726,193 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 330 |
Days with moderate air quality | 35 |
Days w/ poor A.Q. for sensitive groups | 0 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.001% |
Benzene | 0.020% |
Carbon Tetrachloride | 0.002% |
Lead | 0.003% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
West Branch, MI | 2,052 | 26 | 48.0% |
Rose City, MI | 671 | 26 | 48.0% |
Prudenville, MI | 1,755 | 36 | 28.0% |
Roscommon, MI | 1,137 | 36 | 28.0% |
St. Helen, MI | 2,868 | 36 | 28.0% |
City | Population | Air Quality Index | National Avg. |
Bald Knob, AR | 2,868 | 45 | 10.0% |
Simpsonville, KY | 2,868 | 49 | 2.0% |
Drumright, OK | 2,868 | 45 | 10.0% |
North Sioux City, SD | 2,868 | 35 | 30.0% |
Pemberton, BC | 2,868 | n/a | |
St. Helen, MI | 2,868 | 36 | 28.0% |