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Oak Brook, IL weather and climate

DuPage County, IL · population 8,028 · about 679 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Oak Brook's own coordinates.

The year at a glance

Sunny days
182
clear or partly cloudy, per year
Precipitation
38 in
per year
Wet days
127
rain or snow per year
Snowfall
42 in
per year
Hot days
21
above 90 °F
Freezing nights
131
at or below 32 °F
Humidity
71%
average relative
Average temperature
51 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
20406080JanMarMayJulSepNovDaily high, Jan: 32 °FDaily high, Feb: 36 °FDaily high, Mar: 48 °FDaily high, Apr: 60 °FDaily high, May: 72 °FDaily high, Jun: 82 °FDaily high, Jul: 85 °FDaily high, Aug: 83 °FDaily high, Sep: 77 °FDaily high, Oct: 64 °FDaily high, Nov: 49 °FDaily high, Dec: 37 °FDaily low, Jan: 16 °FDaily low, Feb: 19 °FDaily low, Mar: 28 °FDaily low, Apr: 38 °FDaily low, May: 49 °FDaily low, Jun: 59 °FDaily low, Jul: 63 °FDaily low, Aug: 62 °FDaily low, Sep: 54 °FDaily low, Oct: 42 °FDaily low, Nov: 31 °FDaily low, Dec: 22 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high323648607282858377644937
Daily low161928384959636254423122

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.02.04.0JanMarMayJulSepNovOak Brook, Jan: 2.1 inOak Brook, Feb: 2.0 inOak Brook, Mar: 2.7 inOak Brook, Apr: 4.4 inOak Brook, May: 4.5 inOak Brook, Jun: 4.2 inOak Brook, Jul: 3.7 inOak Brook, Aug: 3.7 inOak Brook, Sep: 2.9 inOak Brook, Oct: 3.1 inOak Brook, Nov: 2.5 inOak Brook, Dec: 2.1 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Oak Brook2.12.02.74.44.54.23.73.72.93.12.52.1

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovOak Brook, Jan: 11 daysOak Brook, Feb: 11 daysOak Brook, Mar: 14 daysOak Brook, Apr: 13 daysOak Brook, May: 15 daysOak Brook, Jun: 16 daysOak Brook, Jul: 20 daysOak Brook, Aug: 20 daysOak Brook, Sep: 20 daysOak Brook, Oct: 17 daysOak Brook, Nov: 14 daysOak Brook, Dec: 12 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Oak Brook111114131516202020171412

Compare Oak Brook with another city

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See weather for every covered Illinois city

About this data

Figures are 30 year averages for 1991-2020. 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).