Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 8°F | 27°F | 17°F | 0.3" |
February | 10°F | 30°F | 19°F | 0.5" |
March | 26°F | 46°F | 34°F | 1.2" |
April | 36°F | 61°F | 47°F | 2.9" |
May | 48°F | 73°F | 59°F | 4.0" |
June | 58°F | 82°F | 70°F | 5.0" |
July | 62°F | 86°F | 74°F | 3.2" |
August | 59°F | 82°F | 70°F | 4.3" |
September | 51°F | 77°F | 63°F | 2.9" |
October | 39°F | 63°F | 49°F | 2.3" |
November | 25°F | 48°F | 36°F | 0.9" |
December | 12°F | 30°F | 21°F | 0.8" |
Index | Royal | Iowa | National |
Air quality index | 35 | 39 | 42 |
Pollution index | 769,697 | 1,154,535 | 2,726,193 |
Measurement | Total |
Days measured | 364 |
Days with good air quality | 322 |
Days with moderate air quality | 42 |
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 | 0.002% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Sutherland, IA | 529 | 35 | 30.0% |
Dickens, IA | 206 | 35 | 30.0% |
Spencer, IA | 11,038 | 35 | 30.0% |
Webb, IA | 181 | 35 | 30.0% |
Everly, IA | 595 | 35 | 30.0% |
Royal, IA | 505 | 35 | 30.0% |
City | Population | Air Quality Index | National Avg. |
Galena, AK | 505 | 38 | 24.0% |
Beulah Valley, CO | 505 | 20 | 60.0% |
Sumner, GA | 505 | 40 | 20.0% |
Cisne, IL | 505 | 43 | 14.0% |
West College Corner, IN | 505 | 6 | 88.0% |
Royal, IA | 505 | 35 | 30.0% |