Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 18°F | 34°F | 26°F | 3.3" |
February | 19°F | 35°F | 26°F | 3.0" |
March | 32°F | 51°F | 40°F | 4.3" |
April | 42°F | 64°F | 52°F | 7.2" |
May | 53°F | 75°F | 63°F | 8.0" |
June | 62°F | 83°F | 72°F | 7.5" |
July | 66°F | 85°F | 75°F | 7.1" |
August | 64°F | 83°F | 73°F | 8.2" |
September | 56°F | 78°F | 66°F | 6.3" |
October | 45°F | 65°F | 54°F | 6.6" |
November | 34°F | 51°F | 42°F | 4.3" |
December | 23°F | 37°F | 30°F | 3.5" |
Index | Ottawa | Illinois | National |
Air quality index | 0 | 41 | 42 |
Pollution index | 1,874,490 | 3,148,694 | 2,726,193 |
Measurement | Total |
Days measured | 335 |
Days with good air quality | 334 |
Days with moderate air quality | 1 |
Days w/ poor A.Q. for sensitive groups | 0 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.002% |
Benzene | 0.030% |
Carbon Tetrachloride | 0.010% |
Lead | 0.010% |
Mercury | 0.010% |
City | Population | Air Quality Index | National Avg. |
Troy Grove, IL | 210 | 0 | 100.0% |
LaSalle, IL | 9,086 | 0 | 100.0% |
Kinsman, IL | 96 | 0 | 100.0% |
Oglesby, IL | 3,652 | 0 | 100.0% |
Mendota, IL | 6,927 | 0 | 100.0% |
Ottawa, IL | 18,742 | 0 | 100.0% |
City | Population | Air Quality Index | National Avg. |
Twinsburg, OH | 18,754 | 50 | = 100 |
Hawthorne, NJ | 18,762 | 51 | 2.0% |
Woodcrest, CA | 18,719 | 89 | 78.0% |
Midland, ON | 18,769 | n/a | |
Berea, OH | 18,713 | 50 | = 100 |
Ottawa, IL | 18,742 | 0 | 100.0% |