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 | Deerfield | 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. |
Third Lake, IL | 1,160 | 39 | 22.0% |
Wauconda, IL | 13,629 | 39 | 22.0% |
Lake Bluff, IL | 5,540 | 39 | 22.0% |
Hainesville, IL | 3,595 | 39 | 22.0% |
Round Lake, IL | 18,235 | 39 | 22.0% |
Deerfield, IL | 19,030 | 55 | 10.0% |
City | Population | Air Quality Index | National Avg. |
Liberal, KS | 19,025 | 15 | 70.0% |
Phelan, CA | 19,038 | 89 | 78.0% |
Seabrook, MD | 19,020 | 47 | 6.0% |
Port Alberni, BC | 19,018 | n/a | |
Highland, UT | 19,012 | 46 | 8.0% |
Deerfield, IL | 19,030 | 55 | 10.0% |