Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 16°F | 32°F | 24°F | 1.4" |
February | 17°F | 34°F | 25°F | 1.2" |
March | 30°F | 49°F | 38°F | 2.2" |
April | 39°F | 62°F | 50°F | 3.8" |
May | 49°F | 73°F | 60°F | 4.5" |
June | 59°F | 82°F | 70°F | 4.4" |
July | 63°F | 85°F | 74°F | 4.1" |
August | 62°F | 83°F | 72°F | 3.8" |
September | 54°F | 77°F | 65°F | 3.4" |
October | 43°F | 64°F | 53°F | 3.1" |
November | 32°F | 50°F | 40°F | 1.9" |
December | 21°F | 36°F | 29°F | 2.1" |
Index | Sleepy Hollow | Illinois | National |
Air quality index | 55 | 41 | 42 |
Pollution index | 543,516 | 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 | 0.000% |
Benzene | 0.004% |
Carbon Tetrachloride | 0.000% |
Lead | 0.000% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Island Lake, IL | 8,112 | 39 | 22.0% |
Oakwood Hills, IL | 2,543 | 39 | 22.0% |
Prairie Grove, IL | 2,023 | 39 | 22.0% |
Holiday Hills, IL | 653 | 39 | 22.0% |
Wauconda, IL | 13,629 | 39 | 22.0% |
Sleepy Hollow, IL | 3,276 | 55 | 10.0% |
City | Population | Air Quality Index | National Avg. |
Lake California, CA | 3,276 | 41 | 18.0% |
Waller, TX | 3,276 | 52 | 4.0% |
Marysville, KS | 3,275 | 32 | 36.0% |
Fort Edward, NY | 3,275 | 35 | 30.0% |
Okemah, OK | 3,275 | 36 | 28.0% |
Sleepy Hollow, IL | 3,276 | 55 | 10.0% |