| 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 | East Dundee | Illinois | National |
| Air quality index | 55 | 41 | 50 |
| Pollution index | 543,516 | 3,347,295 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Wauconda, IL | 13,549 | 39 | 22% |
| Oakwood Hills, IL | 2,115 | 39 | 22% |
| Island Lake, IL | 8,025 | 39 | 22% |
| Mundelein, IL | 31,550 | 39 | 22% |
| Prairie Grove, IL | 1,704 | 39 | 22% |
| East Dundee, IL | 3,125 | 55 | 10% |
| City, State | Population | Air Quality Index | National Avg. |
| Corydon, IN | 3,125 | 49 | 2% |
| Algoma, WI | 3,125 | 36 | 28% |
| Whispering Pines, NC | 3,125 | 29 | 42% |
| Moorefield, WV | 3,125 | 38 | 24% |
| Mannford, OK | 3,124 | 45 | 10% |
| East Dundee, IL | 3,125 | 55 | 10% |
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