Winter in Chicago is generally cold and snowy. Source: NOAA (relative humidity, dew point and sun 1961–1990) Note: Some of the addresses prior to 1909 are different from the post-1909 addresses Classifications Chicago Climate according to major climate systemsĬlimate data for Chicago (Midway Airport), 1991–2020 normals, extremes 1928–presentĬlimate data for Chicago (O'Hare Int'l Airport), 1991–2020 normals, extremes 1871–present Here is a list of official weather observation locations for the Chicago office: DatesĪll records lost due to Great Chicago Fire Weather data from Midway Airport before July 1, 1942, and after January 16, 1980, and data from O'Hare Airport before January 17, 1980, are not part of the official climate record of Chicago. Both sites have served in the past as the official observation location, the latter being the current official station. Of the two major airports located in Chicago, Midway Airport began observations in 1928, and O'Hare Airport began them in 1958. The National Weather Service office in Chicago has one of the longest periods of official weather records, dating back to 1870, though all the 18 weather records taken at 181 West Washington Street were lost in the Great Chicago Fire. Chicago's weather is influenced during all four seasons by the nearby presence of Lake Michigan. Annual precipitation in Chicago is moderate and relatively evenly distributed, the driest months being January and February and the wettest July and August. All four seasons are distinctly represented: Winters are cold and often see snow with below 0 Celsius temperatures and windchills, while summers are warm and humid with temperatures being hotter inland, spring and fall bring bouts of both cool and warm weather and fairly sunny skies. Looking to integrate weather data in your website or app? Check out our popular weather API to get data in XML and JSON format for millions of global cities and towns.The climate of Chicago is classified as hot-summer humid continental ( Köppen: Dfa). Please copy the HTML text from below box and place it on website/application where you are using our data. It should be in format of a link to our website. We require proper credit to be provided to us when using our charts. Our users are allowed to export our yearly average charts on this page as png, jpg, pdf or SVG vector image to display on website or for personal and research use. Historical Weather » | Buy Historical Weather Data » Export Following weather fields are provided in CSV format. Air qualityįorecasts and tips on how you can reduce your emissions can be foundĪt Monday will be the 5th Air Pollution Action Day in 2023.Īpart from annual averages, the data is also available in hourly interval in CSV format. Respiratory disease such as asthma should limit prolonged outdoorĪrea residents are urged to reduce pollution levels. Such that widespread ozone and or particulate levels are expected toīe at or above the unhealthy for sensitive groups category of theĪctive children and adults especially people with pulmonary or Greater Chicago Metropolitan Area through Monday night June 5th.Īn Air Pollution Action Day is declared when weather conditions are The Illinois Environmental Protection Agency has determined that theĪir Pollution Action Day designation will remain in effect for the AIR QUALITY ALERT IN EFFECT UNTIL MIDNIGHT CDT MONDAY NIGHT. Effective: T17:01:00-05:00 Expires: T00:00:00-05:00 Certainty: Unknown Event: Air Quality Alert Type: Alert Severity: Unknown Urgency: Unknown Areas: Central Cook DuPage Eastern Will Grundy Kane Kendall Lake McHenry Northern Cook Northern Will Southern Cook Southern Will
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