2021 Weather History at Chicago O'Hare International Airport Illinois, United States
This report shows the past weather for Chicago O'Hare International Airport, providing a weather history for 2021. It features all historical weather data series we have available, including the Chicago O'Hare International Airport temperature history for 2021. You can drill down from year to month and even day level reports by clicking on the graphs.
Hourly Temperature in 2021 at Chicago O'Hare International Airport
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Cloud Cover in 2021 at Chicago O'Hare International Airport
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
no significant cloudno cloud detectedceiling and visibility ok
Daily Precipitation in 2021 at Chicago O'Hare International Airport
Snow Depth in 2021 at Chicago O'Hare International Airport
Observed Weather in 2021 at Chicago O'Hare International Airport
foghazedrizzlelight rainmoderate rainheavy rainfreezing rainsleetsnow grainslight snowmoderate snowheavy snowhailthunderstorm
Hours of Daylight and Twilight in 2021 at Chicago O'Hare International Airport
Sunrise & Sunset with Twilight and Daylight Saving Time in 2021 at Chicago O'Hare International Airport
Humidity Comfort Levels in 2021 at Chicago O'Hare International Airport
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
Wind Speed in 2021 at Chicago O'Hare International Airport
Hourly Wind Speed in 2021 at Chicago O'Hare International Airport
0 mph calm 1 mph light air 4 mph light breeze 8 mph gentle breeze 13 mph moderate breeze 18 mph fresh breeze 25 mph strong breeze 31 mph near gale 39 mph gale 47 mph strong gale 55 mph storm 64 mph violent storm 73 mph hurricane force
Reports by Month
Number of Reports by Day in 2021 at Chicago O'Hare International Airport
Reports by Hour in 2021 at Chicago O'Hare International Airport
This report graphically illustrates the historical weather reports recorded by the weather station at Chicago O'Hare International Airport in 2021.
Airport weather stations throughout the world routinely issue METAR weather reports . Such reports are used by pilots, air traffic controllers, meteorologists, climatologists, and other researchers. They are published via radio transmission and on the internet. We have been collecting and archiving published METAR reports since 2011, and have found third-party sources for archived reports from years prior to that.
The Integrated Surface Database (ISD), maintained and published by NOAA's National Center for Environmental Information , consists of hourly and synoptic weather reports from a variety of sources. We use ISD data to complement and backfill for our METAR archive.
The sources for the averages shown in the daily temperature chart are discussed in greater detail on this station's Averages Report.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for airports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.
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