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Archives for Chicago's hourly weather data updated 24-48 hours after end of each day. MOBILE CHGOWX.COM ...
Weather conditions on bar directly above are near Lakefront. Weather conditions with Moon are O'Hare (official).

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Weather information for Chicagoland.

ChicagoWeatherStation.com 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). The Daily Climate Report is dated the day following the actual observations. In the tables "yesterday" refers to the subject date of the Daily Climate Report.

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chicago o'hare 3 day weather history

ChicagoWeatherStations.com 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 ChicagoWeatherStation.com 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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