Oak Brook and Westchester have remarkably similar climates.
The year at a glance
Averages from 30 years of climate history, 1991-2020
| Oak Brook | Metric | Westchester |
|---|---|---|
| 182 days | Sunny daysclear or partly cloudy skies | 182 days |
| 38 in | Precipitationper year | 38 in |
| 127 days | Wet daysrain or snow per year | 127 days |
| 42 in | Snowfallper year | 39 in |
| 21 days | Hot daysabove 90 °F | 19 days |
| 131 days | Freezing nightsat or below 32 °F | 111 days |
| 71% | Humidityaverage relative | 70% |
| 51 °F | Average temperatureyear round | 52 °F |
Monthly temperatures
Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.
Daily highs
Daily lows
View monthly temperatures as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Oak Brook high | 32 | 36 | 48 | 60 | 72 | 82 | 85 | 83 | 77 | 64 | 49 | 37 |
| Westchester high | 32 | 36 | 47 | 60 | 71 | 81 | 85 | 83 | 76 | 63 | 49 | 37 |
| Oak Brook low | 16 | 19 | 28 | 38 | 49 | 59 | 63 | 62 | 54 | 42 | 31 | 22 |
| Westchester low | 19 | 22 | 31 | 41 | 52 | 62 | 67 | 66 | 58 | 46 | 35 | 25 |
Monthly precipitation
Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.
View monthly precipitation as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Oak Brook | 2.1 | 2.0 | 2.7 | 4.4 | 4.5 | 4.2 | 3.7 | 3.7 | 2.9 | 3.1 | 2.5 | 2.1 |
| Westchester | 2.1 | 2.0 | 2.7 | 4.4 | 4.5 | 4.2 | 3.7 | 3.7 | 2.9 | 3.1 | 2.5 | 2.1 |
Monthly sunny days
Days each month with clear or partly cloudy skies, so compare the same month between cities.
View monthly sunny days as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Oak Brook | 11 | 11 | 14 | 13 | 15 | 16 | 20 | 20 | 20 | 17 | 14 | 12 |
| Westchester | 11 | 11 | 14 | 13 | 15 | 16 | 20 | 20 | 20 | 17 | 14 | 12 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Oak Brook vs another city
- Oak Brook vs Clarendon Hills, IL
- Oak Brook vs Hinsdale, IL
- Oak Brook vs Westmont, IL
- Oak Brook vs Hillside, IL
- Oak Brook vs Western Springs, IL
- Oak Brook vs New York, NY
- Oak Brook vs Los Angeles, CA
- Oak Brook vs Chicago, IL
- Oak Brook vs Houston, TX
- Oak Brook vs Phoenix, AZ
- Oak Brook vs Philadelphia, PA
Westchester vs another city
- Westchester vs Hillside, IL
- Westchester vs La Grange Park, IL
- Westchester vs Broadview, IL
- Westchester vs Bellwood, IL
- Westchester vs Brookfield, IL
- Westchester vs Berkeley, IL
- Westchester vs New York, NY
- Westchester vs Los Angeles, CA
- Westchester vs Chicago, IL
- Westchester vs Houston, TX
- Westchester vs Phoenix, AZ
- Westchester vs Philadelphia, PA
About this data
Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.
Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).