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Cardinal SAT


MOBILE DEVICE? Turn sideways. Weather conditions directly above are near Lakefront. Top tabs refer to O'Hare (official).

Archives for the SPC Convective Outlook are updated daily (approximately) with a live map at the beginning of each article. Follow the link at the end of the article to check for current updates on the NOAA/NWS Storm Prediction Center website. Also, see Archives for Chicago's hourly weather data on CARDINAL NEWS Magazine.



Weather information for Chicagoland. The website project began December 1, 2013.

IMPORTANT NOTE: Dates from late April 2019 to early December 2019 are missing and are being slowly added to the website. Climate data and Twitter info will be added first for each date. Hourly data will be significantly delayed. [Other missing dates: April 30 2014, October 7 2014, October 8 2014, October 9 2014, March 13 2015 (in editing)] contains weather data for each day from Chicago O'Hare International Airport -- the official weather observation station for Chicago.  Data is obtained from the current "3-Day Observed History and the Daily Climate Report (CLI). Some of the tables are crunch to a vertical orientation. For example, 31°F might be shown as a 3 over a 1 in a narrow column. This "compression" of the data usually occurs when there is precipitation in the data table.

You may also search ...
chicago o'hare 3 day weather history

But, the 3 day weather history only provides the data for pervious three days.

The Daily Climate Report section is dated the day following the actual observations. In the climate data tables "yesterday" refers to the subject date of the Daily Climate Report.  Just remember, the date of the report is providing the prior day's full 24 hourly reports.

Each post also highlights the important Twitter posts from Usually, most or all of the weather graphics of forecast-related tweets are archived. All warnings are not posted. Some days the full list of Severe Thunderstorm Warnings are to numerous to archive reasonably in these articles. Occasionally, there are tweets from Chicago TV media stations, Accu-Weather or the The Weather Channel, or other important weather-providing Twitter accounts. is NOT an official National Weather Service website, but archives data from the National Weather Service official Chicago weather station at O'Hare International Airport.

Much of the information in consists of material from the National Weather Service, which is in the public domain. As required by 17 U.S.C. § 403, third parties producing copyrighted works consisting predominantly of the material appearing in NWS Web pages must provide notice with such work(s) identifying the NWS material incorporated and stating that such material is not subject to copyright protection.

Chicago Weather Quote ...
 “If you don’t like the weather here, wait ten minutes and it will change.”

Chicago's Variable Weather
Chicago temperature inland is often 2-5°F above lakefront temperature (especially in Spring and Early Summer) because of the cool waters of Lake Michigan with varying offshore/onshore winds. More information on Chicago's climate and instant weather changes coming soon.

Note About Chicago's Official Weather 
Official weather observations are defined as the weather information that is used to compile a city's climatological normals, averages and extremes.

O'Hare International Airport became the official weather observation site for Chicago on January 17, 1980.

Midway Airport was the official weather observation site from July 1, 1942 to January 16, 1980.

Before the use of the Midway weather observations and since Nov. 1, 1870, several locations in downtown Chicago and at the University of Chicago served as Chicago's official weather observation sites.

Unofficial Midway weather observations began March 1, 1928 (Previously named Chicago Air Park (1923) and Chicago Municipal Airport (December 12, 1927); the airport was named Midway in July 1949).

Unofficial O'Hare weather observations began Oct. 30, 1958 (Orchard Field was renamed O'Hare International Airport in 1949).

Official does not necessarily mean that unofficial weather observations are less accurate or less reliable than the official observations.

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WunderMap® with Temperature/Wind Data || Google: O'Hare  Temps | NE Illinois Temps
Full Screen Motion Weather Radar ( Midwest Cloud Cover and Arlington Heights Weather Forecast

SUNLIGHT DATA FOR SECURITY, TRAFFIC SAFETY, AND SPORTS data with azimuth & trajectory, times for dawn, sunrise, solar noon, sunset, dusk ...
SUNRISE AND SUNSET TIMES IN UTC (if you're not logged in to Google)
CHICAGO UTC-6 during CST (Central Standard Time, e.g., winter)
CHICAGO UTC-5 during CDT (Daylight Savings Time, e.g., summer)