Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 21°F | 39°F | 29°F | 3.2" |
February | 22°F | 41°F | 31°F | 2.9" |
March | 35°F | 56°F | 44°F | 3.7" |
April | 44°F | 68°F | 55°F | 6.8" |
May | 55°F | 76°F | 65°F | 5.2" |
June | 64°F | 85°F | 74°F | 8.0" |
July | 66°F | 87°F | 76°F | 5.2" |
August | 64°F | 85°F | 74°F | 6.3" |
September | 57°F | 80°F | 68°F | 6.6" |
October | 46°F | 68°F | 56°F | 3.3" |
November | 36°F | 55°F | 45°F | 5.0" |
December | 26°F | 41°F | 33°F | 5.3" |
Index | Greenfield | Illinois | National |
Air quality index | 40 | 41 | 42 |
Pollution index | 1,150,670 | 3,148,694 | 2,726,193 |
Measurement | Total |
Days measured | 360 |
Days with good air quality | 287 |
Days with moderate air quality | 73 |
Days w/ poor A.Q. for sensitive groups | 0 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.001% |
Benzene | 0.030% |
Carbon Tetrachloride | 0.000% |
Lead | 0.000% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Manchester, IL | 220 | 40 | 20.0% |
Hettick, IL | 146 | 40 | 20.0% |
Chesterfield, IL | 208 | 40 | 20.0% |
Modesto, IL | 222 | 40 | 20.0% |
Palmyra, IL | 647 | 40 | 20.0% |
Greenfield, IL | 1,481 | 40 | 20.0% |
City | Population | Air Quality Index | National Avg. |
St. David, AZ | 1,481 | 45 | 10.0% |
Lewiston, CA | 1,481 | 42 | 16.0% |
Markle, IN | 1,481 | 31 | 38.0% |
Beattyville, KY | 1,481 | 33 | 34.0% |
Tarkio, MO | 1,481 | 43 | 14.0% |
Greenfield, IL | 1,481 | 40 | 20.0% |