Official National Weather Service observations at Chicago O'Hare International Airport (KORD), the market's resolution source, recorded a maximum temperature of 40°F on April 1, 2026, with a daily low of 36°F—14°F below the 1991–2020 normal high of 53°F—solidifying trader consensus at 100% implied probability for the 40-41°F outcome. This positioning reflects verified automated surface observing system (ASOS) data confirming partly cloudy, windy conditions under a post-frontal cool air mass following the record 81°F heat at O'Hare on March 30. While final CLI reports rarely revise such measurements, an unlikely data correction from preliminary to verified records could challenge this, though historical precedents show minimal discrepancies post-24 hours. No further updates expected as the market nears resolution.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Chicago on April 1?
Highest temperature in Chicago on April 1?
40-41°F 100.0%
33°F or below <1%
34-35°F <1%
36-37°F <1%
$183,598 Vol.
$183,598 Vol.
33°F or below
No
34-35°F
No
36-37°F
No
38-39°F
No
40-41°F
Yes
42-43°F
No
44-45°F
No
46-47°F
No
48-49°F
No
50-51°F
No
52°F or higher
No
40-41°F 100.0%
33°F or below <1%
34-35°F <1%
36-37°F <1%
$183,598 Vol.
$183,598 Vol.
33°F or below
No
34-35°F
No
36-37°F
No
38-39°F
No
40-41°F
Yes
42-43°F
No
44-45°F
No
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 29, 2026, 2:29 PM 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
Official National Weather Service observations at Chicago O'Hare International Airport (KORD), the market's resolution source, recorded a maximum temperature of 40°F on April 1, 2026, with a daily low of 36°F—14°F below the 1991–2020 normal high of 53°F—solidifying trader consensus at 100% implied probability for the 40-41°F outcome. This positioning reflects verified automated surface observing system (ASOS) data confirming partly cloudy, windy conditions under a post-frontal cool air mass following the record 81°F heat at O'Hare on March 30. While final CLI reports rarely revise such measurements, an unlikely data correction from preliminary to verified records could challenge this, though historical precedents show minimal discrepancies post-24 hours. No further updates expected as the market nears resolution.
Experimental AI-generated summary referencing Polymarket data · Updated
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