Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 18°F | 33°F | 25°F | 1.1" |
February | 19°F | 34°F | 26°F | 1.4" |
March | 30°F | 48°F | 38°F | 1.8" |
April | 39°F | 60°F | 49°F | 2.7" |
May | 49°F | 71°F | 60°F | 3.6" |
June | 60°F | 81°F | 69°F | 4.7" |
July | 65°F | 85°F | 74°F | 4.0" |
August | 64°F | 83°F | 73°F | 4.4" |
September | 56°F | 76°F | 66°F | 2.7" |
October | 45°F | 64°F | 54°F | 3.2" |
November | 34°F | 50°F | 42°F | 1.7" |
December | 23°F | 37°F | 30°F | 2.0" |
Index | Forest Lake | 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. |
Grayslake, IL | 20,482 | 39 | 22.0% |
Libertyville, IL | 20,300 | 39 | 22.0% |
Johnsburg, IL | 6,354 | 39 | 22.0% |
Oakwood Hills, IL | 2,543 | 39 | 22.0% |
Round Lake Heights, IL | 3,009 | 39 | 22.0% |
Forest Lake, IL | 1,292 | 55 | 10.0% |
City | Population | Air Quality Index | National Avg. |
Redstone Arsenal, AL | 1,292 | 44 | 12.0% |
Sherwood No. 159, SK | 1,292 | n/a | |
Brookdale, CA | 1,293 | 35 | 30.0% |
Tennille, GA | 1,291 | 38 | 24.0% |
Lapwai, ID | 1,291 | 29 | 42.0% |
Forest Lake, IL | 1,292 | 55 | 10.0% |