Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 12°F | 29°F | 20°F | 0.6" |
February | 13°F | 32°F | 22°F | 0.8" |
March | 28°F | 48°F | 37°F | 1.7" |
April | 39°F | 62°F | 49°F | 4.8" |
May | 50°F | 73°F | 61°F | 5.8" |
June | 60°F | 82°F | 71°F | 5.1" |
July | 63°F | 84°F | 74°F | 4.0" |
August | 61°F | 82°F | 71°F | 4.9" |
September | 52°F | 77°F | 64°F | 3.9" |
October | 41°F | 63°F | 51°F | 2.9" |
November | 29°F | 49°F | 38°F | 1.5" |
December | 16°F | 33°F | 24°F | 1.4" |
Index | Garwin | Iowa | National |
Air quality index | 39 | 39 | 50 |
Pollution index | 416,114 | 1,643,836 | 5,066,862 |
Measurement | Total |
Days measured | 363 |
Days with good air quality | 286 |
Days with moderate air quality | 77 |
Days w/ poor A.Q. for sensitive groups | 0 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.000% |
Benzene | 0.004% |
Carbon Tetrachloride | 0.001% |
Lead | 0.000% |
Mercury | 0.000% |
City, State | Population | Air Quality Index | National Avg. |
Gilman, IA | 598 | 37 | 26% |
Laurel, IA | 358 | 37 | 26% |
Ferguson, IA | 137 | 37 | 26% |
Haverhill, IA | 169 | 37 | 26% |
Marshalltown, IA | 27,637 | 37 | 26% |
Garwin, IA | 503 | 39 | 22% |
City, State | Population | Air Quality Index | National Avg. |
Malone, WA | 503 | 30 | 40% |
Jacksonboro, SC | 503 | 29 | 42% |
Fillmore, NY | 503 | 39 | 22% |
Toksook Bay, AK | 503 | 31 | 38% |
Mooresboro, NC | 503 | 36 | 28% |
Garwin, IA | 503 | 39 | 22% |