National Weather Service United States Department of Commerce

Heavy Rain From the Plains to the Northeast; Heat Wave Begins

Severe thunderstorms and heavy rainfall are likely across parts of the Northeast, portions of the northern and central Plains, and the Ohio Valley. Portions of northeast Missouri and central Illinois could experience locally significant flash flooding. Dangerously hot conditions are expected in the Central Plains, Lower and Middle Mississippi Valley, and Southeast. Read More >

Chicago, IL

Weather Forecast Office

Climate Plots for Northern Illinois and Northwest Indiana

Weather.gov > Chicago, IL > Climate Plots for Northern Illinois and Northwest Indiana

 

Climate data on this page is PRELIMINARY (unofficial). CERTIFIED (official) climate data is available from the National Centers for Environmental Information (NCEI) or the Midwestern Regional Climate Center (MRCC).  
 

Graphs of observed temperatures and precipitation are available from several airport stations from around northern Illinois and northwest Indiana. These are available for individual months, and the year to date. Go to the bottom of the page for help on how to interpret these graphs.

 

2025 Graphs:
Aurora Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
DuPage Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Midway Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
O'Hare Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Palwaukee Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Rockford Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Romeoville NWS Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Waukegan Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Valparaiso Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

 

2024 Graphs:
Aurora Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
DuPage Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Midway Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
O'Hare Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Palwaukee Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Rockford Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Romeoville NWS Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Waukegan Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Valparaiso Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

 

2023 Graphs:
Aurora Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
DuPage Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Midway Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
O'Hare Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Palwaukee Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Rockford Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Romeoville NWS Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Waukegan Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Valparaiso Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

 

2022 Graphs:
Aurora Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
DuPage Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Midway Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
O'Hare Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Palwaukee Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Rockford Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Romeoville NWS Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Waukegan Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Valparaiso Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

 

2021 Graphs:
Aurora Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
DuPage Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Midway Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
O'Hare Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Palwaukee Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Rockford Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Romeoville NWS Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Waukegan Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Valparaiso Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

 

2020 Graphs:
Aurora Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
DuPage Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Midway Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
O'Hare Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Palwaukee Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Rockford Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Romeoville NWS Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Waukegan Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Valparaiso Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

 

2019 Graphs:
Aurora Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
DuPage Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Midway Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
O'Hare Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Palwaukee Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Rockford Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Romeoville NWS Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Waukegan Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Valparaiso Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

 

2018 Graphs:
Aurora Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
DuPage Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Midway Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
O'Hare Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Palwaukee Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Rockford Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Romeoville NWS Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Waukegan Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Valparaiso Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

 

2017 Graphs:
Aurora Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
DuPage Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Midway Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
O'Hare Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Palwaukee Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Rockford Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Romeoville NWS Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Waukegan Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Valparaiso Airport Annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

 

 

For specific daily observations, visit https://www.weather.gov/wrh/Climate?wfo=lot. 

Here are descriptions on how to interpret these graphs:

 

Climate Plots Prior to 2022:

Climate plot for Chicago O'Hare for July 2015

This is an example of the monthly climate plot. The observed high and low temperatures are indicated by the tops and bottoms of the vertical blue bars, respectively. The normal temperature ranges are indicated by the green band. Record highs are shown on the top of the light red band, and record lows are indicated along the bottom of the light blue band.

 

Chicago O'Hare annual climate plot for 2014

This is an example of the year-to-date climate plot. As with the monthly plot, observed temperatures are shown by the dark blue areas, normals with the light green areas, record highs in the light red areas, and record lows in the light blue areas.

The bottom portion of the graph indicates the precipitation and snowfall for the year-to-date. The yellow line (and green area below it) represents the normal year-to-date total at the given time. Periods that have year-to-date totals above the climatological normals are shown by dark green areas above the yellow line. Periods that are below normal are shown with the brown areas below the yellow line.

 

Climate Plots From 2022 Onward:

Climate plot for Chicago O'Hare for March 2024

Chicago O'Hare annual climate plot for 2024

Monthly and year-to-date climate plots from 2022 onward follow the same overall styling and can be interpreted in the same way that the older plots from prior to 2022 are interpreted, though they use slightly different colors.
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