Trader consensus overwhelmingly favors 58-59°F at 99.9% implied probability, anchored by the National Weather Service's official high temperature measurement of 58°F at Chicago O'Hare International Airport (KORD) on May 13, 2026, derived from Automated Surface Observing System (ASOS) hourly observations peaking at 57.9°F amid persistent northeast winds gusting to 25 mph and partly cloudy skies. This unseasonably cool reading—well below the mid-May climatological normal of 70°F—stems from post-cold-frontal conditions and Lake Michigan onshore flow suppressing daytime heating, with afternoon temperatures dipping into the low 50s°F. Scenarios challenging this include an exceedingly rare NWS data revision in the final climatological report, though preliminary data aligns precisely with the market's lead outcome. Watch for Wunderground's daily history confirmation at KORD to finalize resolution.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in Chicago on May 13?
Highest temperature in Chicago on May 13?
58-59°F 99.8%
60-61°F <1%
62-63°F <1%
64°F or higher <1%
$97,064 Vol.
$97,064 Vol.
58-59°F
100%
60-61°F
<1%
62-63°F
<1%
64°F or higher
<1%
58-59°F 99.8%
60-61°F <1%
62-63°F <1%
64°F or higher <1%
$97,064 Vol.
$97,064 Vol.
58-59°F
100%
60-61°F
<1%
62-63°F
<1%
64°F or higher
<1%
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: May 11, 2026, 12:15 AM ET
Resolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...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...Trader consensus overwhelmingly favors 58-59°F at 99.9% implied probability, anchored by the National Weather Service's official high temperature measurement of 58°F at Chicago O'Hare International Airport (KORD) on May 13, 2026, derived from Automated Surface Observing System (ASOS) hourly observations peaking at 57.9°F amid persistent northeast winds gusting to 25 mph and partly cloudy skies. This unseasonably cool reading—well below the mid-May climatological normal of 70°F—stems from post-cold-frontal conditions and Lake Michigan onshore flow suppressing daytime heating, with afternoon temperatures dipping into the low 50s°F. Scenarios challenging this include an exceedingly rare NWS data revision in the final climatological report, though preliminary data aligns precisely with the market's lead outcome. Watch for Wunderground's daily history confirmation at KORD to finalize resolution.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated



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