Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 9°F | 25°F | 17°F | 0.7" |
February | 11°F | 29°F | 20°F | 1.1" |
March | 25°F | 44°F | 34°F | 2.2" |
April | 36°F | 60°F | 47°F | 5.1" |
May | 48°F | 71°F | 59°F | 5.0" |
June | 58°F | 81°F | 69°F | 5.4" |
July | 61°F | 84°F | 72°F | 4.2" |
August | 59°F | 82°F | 70°F | 4.0" |
September | 51°F | 76°F | 62°F | 4.3" |
October | 38°F | 62°F | 49°F | 2.7" |
November | 26°F | 47°F | 36°F | 1.5" |
December | 13°F | 29°F | 21°F | 1.4" |
Index | Mason City | Iowa | National |
Air quality index | 15 | 39 | 42 |
Pollution index | 1,013,960 | 1,154,535 | 2,726,193 |
Measurement | Total |
Days measured | 118 |
Days with good air quality | 118 |
Days with moderate air quality | 0 |
Days w/ poor A.Q. for sensitive groups | 0 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.000% |
Benzene | 0.010% |
Carbon Tetrachloride | 0.001% |
Lead | 0.001% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Ventura, IA | 761 | 15 | 70.0% |
Plymouth, IA | 466 | 15 | 70.0% |
Rockford, IA | 827 | 15 | 70.0% |
Hanlontown, IA | 191 | 15 | 70.0% |
Grafton, IA | 180 | 15 | 70.0% |
Mason City, IA | 27,064 | 15 | 70.0% |
City | Population | Air Quality Index | National Avg. |
Sainte-Thérèse, QC | 27,055 | n/a | |
Wheeling, WV | 27,046 | 39 | 22.0% |
Lincoln, ON | 27,082 | n/a | |
Clarence-Rockland, ON | 27,082 | n/a | |
Wakefield, MA | 27,041 | 43 | 14.0% |
Mason City, IA | 27,064 | 15 | 70.0% |