Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 14°F | 37°F | 24°F | 0.6" |
February | 16°F | 41°F | 27°F | 0.9" |
March | 29°F | 56°F | 41°F | 1.5" |
April | 40°F | 67°F | 53°F | 3.8" |
May | 50°F | 77°F | 63°F | 5.2" |
June | 62°F | 87°F | 74°F | 4.9" |
July | 66°F | 91°F | 78°F | 3.1" |
August | 64°F | 88°F | 75°F | 6.1" |
September | 55°F | 82°F | 67°F | 3.7" |
October | 42°F | 69°F | 54°F | 3.0" |
November | 29°F | 55°F | 41°F | 1.0" |
December | 17°F | 39°F | 27°F | 1.7" |
Index | Portsmouth | Iowa | National |
Air quality index | 40 | 39 | 42 |
Pollution index | 4,349,930 | 1,154,535 | 2,726,193 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 283 |
Days with moderate air quality | 82 |
Days w/ poor A.Q. for sensitive groups | 0 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.210% |
Benzene | 0.040% |
Carbon Tetrachloride | 0.004% |
Lead | 0.100% |
Mercury | 0.160% |
City | Population | Air Quality Index | National Avg. |
Westphalia, IA | 161 | 40 | 20.0% |
Persia, IA | 342 | 40 | 20.0% |
Panama, IA | 272 | 40 | 20.0% |
Neola, IA | 1,055 | 40 | 20.0% |
Defiance, IA | 216 | 40 | 20.0% |
Portsmouth, IA | 171 | 40 | 20.0% |
City | Population | Air Quality Index | National Avg. |
Silver Springs, AK | 171 | 31 | 38.0% |
Banks, AL | 171 | 52 | 4.0% |
Paint Rock, AL | 171 | 44 | 12.0% |
Caulksville, AR | 171 | 36 | 28.0% |
Concord, AR | 171 | 45 | 10.0% |
Portsmouth, IA | 171 | 40 | 20.0% |