| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 40°F | 32°F | 8.1" |
| February | 21°F | 38°F | 28°F | 4.5" |
| March | 34°F | 55°F | 44°F | 5.9" |
| April | 42°F | 66°F | 54°F | 6.5" |
| May | 53°F | 77°F | 65°F | 3.5" |
| June | 64°F | 84°F | 74°F | 5.1" |
| July | 65°F | 85°F | 75°F | 6.3" |
| August | 68°F | 88°F | 77°F | 5.9" |
| September | 59°F | 81°F | 70°F | 9.0" |
| October | 49°F | 68°F | 58°F | 4.9" |
| November | 35°F | 54°F | 44°F | 5.0" |
| December | 25°F | 38°F | 31°F | 4.6" |
| Index | Wynnedale | Indiana | National |
| Air quality index | 54 | 56 | 42 |
| Pollution index | 2,395,300 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 148 |
| Days with moderate air quality | 212 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Noblesville, IN | 64,430 | 42 | 16.0% |
| Homecroft, IN | 654 | 54 | 8.0% |
| Indianapolis, IN | 869,387 | 54 | 8.0% |
| Spring Hill, IN | 56 | 54 | 8.0% |
| Westfield, IN | 41,652 | 54 | 8.0% |
| Wynnedale, IN | 196 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Stevinson, CA | 196 | 48 | 4.0% |
| Trowbridge, CA | 196 | 44 | 12.0% |
| Yolo, CA | 196 | 52 | 4.0% |
| Du Pont, GA | 196 | 35 | 30.0% |
| Leighton, IA | 196 | 39 | 22.0% |
| Wynnedale, IN | 196 | 54 | 8.0% |
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