Annual mean
Annual mean of daily highs
Annual mean of daily lows
Willowbrook CDP, Illinois
Official LSAD Designation: Willowbrook CDP • Census GEOID: 1781938
• Will County
Climate Normals & Weather Observations
30-year climate normals (1991–2020) and weather observations for Willowbrook CDP.
Reference Weather Station: PARK FOREST, IL US (ID: USC00116616)
• Located 8.4 miles from community center
• Elevation: 216.4 m
| Month | Average High (°F) | Average Low (°F) | Mean Temp (°F) | Precipitation (in) |
|---|---|---|---|---|
| January | 31.1° | 15.2° | 23.2° | 2.49" |
| February | 35.2° | 18.4° | 26.8° | 2.15" |
| March | 46.4° | 28.1° | 37.2° | 2.65" |
| April | 59.3° | 38.3° | 48.8° | 4.02" |
| May | 70.6° | 49.3° | 60.0° | 4.57" |
| June | 80.2° | 58.9° | 69.5° | 4.91" |
| July | 83.9° | 63.8° | 73.9° | 4.73" |
| August | 82.0° | 62.0° | 72.0° | 4.02" |
| September | 75.8° | 54.6° | 65.2° | 3.44" |
| October | 63.1° | 42.4° | 52.8° | 3.65" |
| November | 48.2° | 31.4° | 39.8° | 3.00" |
| December | 36.3° | 21.5° | 28.9° | 2.47" |
Annual Temperature History
2010–2025, completed calendar years only.
NOAA station PARK FOREST, IL US (ID: USC00116616) • 8.4 miles from community center .
This is the same reference station used for monthly normals.
Source: NOAA NCEI Global Summary of the Year.
Annual temperature data table (°F)
| Year | Annual mean (°F) | Annual mean of daily highs (°F) | Annual mean of daily lows (°F) |
|---|---|---|---|
| 2010 | 51.5 | 60.9 | 42.0 |
| 2011 | 50.6 | 59.3 | 42.0 |
| 2012 | 53.7 | 63.4 | 44.1 |
| 2013 | 48.8 | 58.1 | 39.5 |
| 2014 | 46.4 | 56.0 | 36.9 |
| 2015 | 49.8 | 58.9 | 40.6 |
| 2016 | 51.9 | 60.9 | 42.8 |
| 2017 | 51.4 | 61.1 | 41.6 |
| 2018 | 49.6 | 59.1 | 40.1 |
| 2019 | 49.0 | 58.2 | 39.8 |
| 2020 | 51.0 | 60.4 | 41.6 |
| 2021 | 51.5 | 60.8 | 42.1 |
| 2022 | 49.4 | 59.0 | 39.8 |
| 2023 | 51.9 | 61.3 | 42.5 |
| 2024 | 53.2 | 62.8 | 43.5 |
| 2025 | 50.9 | 60.7 | 41.1 |
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.