The National Weather Service's official observation at Chicago O'Hare International Airport (KORD) recorded a high temperature of 48°F on April 19, 2026, driving trader consensus to a 100% implied probability for the 48-49°F outcome as the market nears resolution. This below-normal peak—against an April 19 average of 60°F—stemmed from a cool upper-air mass, gusty winds limiting surface heating, and lingering effects of recent frost advisories, overriding pre-event forecast models that clustered around 49-51°F. Verified airport Automated Surface Observing System data confirms the reading, with no significant hourly deviations above 48°F. Resolution could only shift via rare NWS data correction, pending final climatological report.
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 April 19?
Highest temperature in Chicago on April 19?
48-49°F 100.0%
43°F or below <1%
44-45°F <1%
46-47°F <1%
$121,143 Vol.
$121,143 Vol.
Apr 19, 2026
43°F or below
No
44-45°F
No
46-47°F
No
48-49°F
Yes
50-51°F
No
52-53°F
No
54-55°F
No
56-57°F
No
58-59°F
No
60-61°F
No
62°F or higher
No
48-49°F 100.0%
43°F or below <1%
44-45°F <1%
46-47°F <1%
$121,143 Vol.
$121,143 Vol.
Apr 19, 2026
43°F or below
$12,042 Vol.
No
44-45°F
$6,458 Vol.
No
46-47°F
$10,324 Vol.
No
48-49°F
$28,314 Vol.
Yes
50-51°F
$16,898 Vol.
No
52-53°F
$16,587 Vol.
No
54-55°F
$9,533 Vol.
No
56-57°F
$6,240 Vol.
No
58-59°F
$3,475 Vol.
No
60-61°F
$3,741 Vol.
No
62°F or higher
$7,531 Vol.
No
This market will resolve to the temperature range that contains the highest temperature recorded at the Chicago O'Hare Intl Airport Station in degrees Fahrenheit on 19 Apr '26.
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.The National Weather Service's official observation at Chicago O'Hare International Airport (KORD) recorded a high temperature of 48°F on April 19, 2026, driving trader consensus to a 100% implied probability for the 48-49°F outcome as the market nears resolution. This below-normal peak—against an April 19 average of 60°F—stemmed from a cool upper-air mass, gusty winds limiting surface heating, and lingering effects of recent frost advisories, overriding pre-event forecast models that clustered around 49-51°F. Verified airport Automated Surface Observing System data confirms the reading, with no significant hourly deviations above 48°F. Resolution could only shift via rare NWS data correction, pending final climatological report.
This market will resolve to the temperature range that contains the highest temperature recorded at the Chicago O'Hare Intl Airport Station in degrees Fahrenheit on 19 Apr '26.
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.
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: Apr 17, 2026, 12:05 AM ET
Volume
$121,143End Date
Apr 19, 2026Market Opened
Apr 17, 2026, 12:05 AM ETResolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
This market will resolve to the temperature range that contains the highest temperature recorded at the Chicago O'Hare Intl Airport Station in degrees Fahrenheit on 19 Apr '26.
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.The National Weather Service's official observation at Chicago O'Hare International Airport (KORD) recorded a high temperature of 48°F on April 19, 2026, driving trader consensus to a 100% implied probability for the 48-49°F outcome as the market nears resolution. This below-normal peak—against an April 19 average of 60°F—stemmed from a cool upper-air mass, gusty winds limiting surface heating, and lingering effects of recent frost advisories, overriding pre-event forecast models that clustered around 49-51°F. Verified airport Automated Surface Observing System data confirms the reading, with no significant hourly deviations above 48°F. Resolution could only shift via rare NWS data correction, pending final climatological report.
This market will resolve to the temperature range that contains the highest temperature recorded at the Chicago O'Hare Intl Airport Station in degrees Fahrenheit on 19 Apr '26.
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.
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.
Volume
$121,143End Date
Apr 19, 2026Market Opened
Apr 17, 2026, 12:05 AM ETResolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
The National Weather Service's official observation at Chicago O'Hare International Airport (KORD) recorded a high temperature of 48°F on April 19, 2026, driving trader consensus to a 100% implied probability for the 48-49°F outcome as the market nears resolution. This below-normal peak—against an April 19 average of 60°F—stemmed from a cool upper-air mass, gusty winds limiting surface heating, and lingering effects of recent frost advisories, overriding pre-event forecast models that clustered around 49-51°F. Verified airport Automated Surface Observing System data confirms the reading, with no significant hourly deviations above 48°F. Resolution could only shift via rare NWS data correction, pending final climatological report.
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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