Trader consensus on Polymarket has locked in 44-45°F at 100% implied probability for Chicago's highest temperature on March 27, driven by the National Weather Service's official preliminary climate summary confirming a maximum of 45°F at 2:26 PM local time at O'Hare International Airport (KORD), the market's resolution source. This aligns precisely with late-stage forecast consensus from NOAA's GFS and ECMWF ensemble models, which projected 44-45°F amid a weak southerly flow moderating post-frontal cool air masses, cloudy skies, and light winds. Historical March averages hover around 51°F, underscoring the below-normal chill. Realistic challenges are minimal but could include rare post-preliminary revisions by NOAA's National Centers for Environmental Information due to data validation, though such adjustments seldom exceed 1°F for verified automated surface observing system readings.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Chicago on March 27?
Highest temperature in Chicago on March 27?
44-45°F 100.0%
33°F or below <1%
34-35°F <1%
36-37°F <1%
$201,472 Vol.
$201,472 Vol.
33°F or below
No
34-35°F
No
36-37°F
No
38-39°F
No
40-41°F
No
42-43°F
No
44-45°F
Yes
46-47°F
No
48-49°F
No
50-51°F
No
52°F or higher
No
44-45°F 100.0%
33°F or below <1%
34-35°F <1%
36-37°F <1%
$201,472 Vol.
$201,472 Vol.
33°F or below
No
34-35°F
No
36-37°F
No
38-39°F
No
40-41°F
No
42-43°F
No
44-45°F
Yes
46-47°F
No
48-49°F
No
50-51°F
No
52°F or higher
No
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Chicago O'Hare Intl Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/us/il/chicago/KORD.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve to "Yes" until all data for this date has been finalized.
The resolution source for this market measures temperatures to whole degrees Fahrenheit (eg, 21°F). Thus, this is the level of precision that will be used when resolving the market.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Market Opened: Mar 23, 2026, 6:02 AM ET
Resolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Chicago O'Hare Intl Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/us/il/chicago/KORD.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve to "Yes" until all data for this date has been finalized.
The resolution source for this market measures temperatures to whole degrees Fahrenheit (eg, 21°F). Thus, this is the level of precision that will be used when resolving the market.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Resolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Trader consensus on Polymarket has locked in 44-45°F at 100% implied probability for Chicago's highest temperature on March 27, driven by the National Weather Service's official preliminary climate summary confirming a maximum of 45°F at 2:26 PM local time at O'Hare International Airport (KORD), the market's resolution source. This aligns precisely with late-stage forecast consensus from NOAA's GFS and ECMWF ensemble models, which projected 44-45°F amid a weak southerly flow moderating post-frontal cool air masses, cloudy skies, and light winds. Historical March averages hover around 51°F, underscoring the below-normal chill. Realistic challenges are minimal but could include rare post-preliminary revisions by NOAA's National Centers for Environmental Information due to data validation, though such adjustments seldom exceed 1°F for verified automated surface observing system readings.
Experimental AI-generated summary referencing Polymarket data · Updated
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