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				| 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 | Deer Park | 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. | 
| Volo, IL | 5,498 | 39 | 22.0% | 
| Lake Bluff, IL | 5,540 | 39 | 22.0% | 
| Round Lake Beach, IL | 27,313 | 39 | 22.0% | 
| Gages Lake, IL | 9,939 | 39 | 22.0% | 
| Prairie Grove, IL | 2,023 | 39 | 22.0% | 
| Deer Park, IL | 4,005 | 55 | 10.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Pearl River, MS | 4,005 | 36 | 28.0% | 
| Centerville, MN | 4,006 | 46 | 8.0% | 
| Fredericktown, MO | 4,006 | 54 | 8.0% | 
| Akron, PA | 4,006 | 45 | 10.0% | 
| Kildeer, IL | 4,007 | 55 | 10.0% | 
| Deer Park, IL | 4,005 | 55 | 10.0% |