| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 32°F | 25°F | 4.1" |
| February | 16°F | 31°F | 23°F | 3.2" |
| March | 29°F | 48°F | 38°F | 3.7" |
| April | 38°F | 62°F | 49°F | 5.9" |
| May | 49°F | 74°F | 61°F | 4.0" |
| June | 60°F | 84°F | 72°F | 4.6" |
| July | 60°F | 85°F | 73°F | 9.3" |
| August | 62°F | 83°F | 72°F | 8.2" |
| September | 54°F | 81°F | 67°F | 2.4" |
| October | 45°F | 68°F | 55°F | 5.0" |
| November | 30°F | 49°F | 39°F | 3.4" |
| December | 16°F | 31°F | 23°F | 2.7" |
| Index | Sugar Grove | 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. |
| Millbrook, IL | 357 | 0 | 100.0% |
| Yorkville, IL | 19,386 | 0 | 100.0% |
| Sandwich, IL | 7,351 | 0 | 100.0% |
| Millington, IL | 662 | 0 | 100.0% |
| Kaneville, IL | 518 | 0 | 100.0% |
| Sugar Grove, IL | 9,756 | 0 | 100.0% |
| City | Population | Air Quality Index | National Avg. |
| Eunice, LA | 9,754 | 41 | 18.0% |
| San Diego Country Estates, CA | 9,752 | 64 | 28.0% |
| Ellisville, MO | 9,752 | 54 | 8.0% |
| Sparta, WI | 9,751 | 35 | 30.0% |
| Oil City, PA | 9,750 | 9 | 82.0% |
| Sugar Grove, IL | 9,756 | 0 | 100.0% |
Here are the best places to live in Illinois
See the best places to live in Sugar Grove
Check out the 10 safest cities in Illinois
Safest Cities In The US