Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 16°F | 34°F | 25°F | 2.3" |
February | 18°F | 36°F | 27°F | 2.3" |
March | 29°F | 49°F | 39°F | 2.8" |
April | 38°F | 63°F | 50°F | 3.9" |
May | 48°F | 73°F | 60°F | 5.4" |
June | 59°F | 83°F | 71°F | 4.5" |
July | 64°F | 86°F | 75°F | 5.2" |
August | 63°F | 84°F | 74°F | 4.4" |
September | 56°F | 78°F | 66°F | 3.6" |
October | 44°F | 65°F | 54°F | 3.4" |
November | 32°F | 52°F | 42°F | 2.3" |
December | 21°F | 38°F | 29°F | 2.9" |
Index | Harwood Heights | Illinois | National |
Air quality index | 55 | 41 | 42 |
Pollution index | 3,795,410 | 3,148,694 | 2,726,193 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 121 |
Days with moderate air quality | 227 |
Days w/ poor A.Q. for sensitive groups | 16 |
Days with unhealthy air quality | 1 |
Pollutant | Total |
Arsenic | 0.030% |
Benzene | 0.050% |
Carbon Tetrachloride | 0.010% |
Lead | 0.003% |
Mercury | 0.310% |
City | Population | Air Quality Index | National Avg. |
Arlington Heights, IL | 75,071 | 55 | 10.0% |
Brookfield, IL | 18,520 | 55 | 10.0% |
Forest Park, IL | 13,808 | 55 | 10.0% |
Addison, IL | 36,714 | 55 | 10.0% |
Golf, IL | 521 | 55 | 10.0% |
Harwood Heights, IL | 8,393 | 55 | 10.0% |
City | Population | Air Quality Index | National Avg. |
Beaver Falls, PA | 8,393 | 6 | 88.0% |
Kennedale, TX | 8,393 | 51 | 2.0% |
Kalifornsky, AK | 8,395 | 31 | 38.0% |
Warrenton, MO | 8,388 | 54 | 8.0% |
Torbay, NL | 8,388 | n/a | |
Harwood Heights, IL | 8,393 | 55 | 10.0% |