Official National Weather Service observations at Chicago O'Hare International Airport (KORD) confirm the highest temperature on April 26, 2026, reached only 59°F around midday, well below the 65°F threshold amid persistent cloud cover, showers, and gusty winds from a cool air mass over the Midwest. This aligns with pre-event forecast model consensus from NOAA, projecting daytime highs near 55-62°F under overcast conditions and periods of light precipitation, as steering patterns funneled chilly Canadian air southward. Trader consensus at 100% implied probability for "65°F or below" reflects this verified ASOS measurement data, with negligible risk of revision given standardized airport station protocols. Only an anomalous post-hoc data correction from NWS could challenge resolution, though historical precedents show such changes are rare for clear days. April normals hover near 63°F, underscoring the unseasonably cool conditions.
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 26?
Highest temperature in Chicago on April 26?
65°F or below 100.0%
66-67°F <1%
68-69°F <1%
70-71°F <1%
$26,657 Vol.
$26,657 Vol.
Apr 26, 2026
65°F or below
Yes
66-67°F
No
68-69°F
No
70-71°F
No
72-73°F
No
74-75°F
No
76-77°F
No
78-79°F
No
80-81°F
No
82-83°F
No
84°F or higher
No
65°F or below 100.0%
66-67°F <1%
68-69°F <1%
70-71°F <1%
$26,657 Vol.
$26,657 Vol.
Apr 26, 2026
65°F or below
$5,952 Vol.
Yes
66-67°F
$4,000 Vol.
No
68-69°F
$5,450 Vol.
No
70-71°F
$3,831 Vol.
No
72-73°F
$3,346 Vol.
No
74-75°F
$1,114 Vol.
No
76-77°F
$549 Vol.
No
78-79°F
$478 Vol.
No
80-81°F
$730 Vol.
No
82-83°F
$652 Vol.
No
84°F or higher
$553 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 26 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.Official National Weather Service observations at Chicago O'Hare International Airport (KORD) confirm the highest temperature on April 26, 2026, reached only 59°F around midday, well below the 65°F threshold amid persistent cloud cover, showers, and gusty winds from a cool air mass over the Midwest. This aligns with pre-event forecast model consensus from NOAA, projecting daytime highs near 55-62°F under overcast conditions and periods of light precipitation, as steering patterns funneled chilly Canadian air southward. Trader consensus at 100% implied probability for "65°F or below" reflects this verified ASOS measurement data, with negligible risk of revision given standardized airport station protocols. Only an anomalous post-hoc data correction from NWS could challenge resolution, though historical precedents show such changes are rare for clear days. April normals hover near 63°F, underscoring the unseasonably cool conditions.
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 26 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 24, 2026, 12:07 AM ET
Volume
$26,657End Date
Apr 26, 2026Market Opened
Apr 24, 2026, 12:07 AM ETResolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...Outcome proposed: Yes
No dispute
Final outcome: Yes
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 26 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.Official National Weather Service observations at Chicago O'Hare International Airport (KORD) confirm the highest temperature on April 26, 2026, reached only 59°F around midday, well below the 65°F threshold amid persistent cloud cover, showers, and gusty winds from a cool air mass over the Midwest. This aligns with pre-event forecast model consensus from NOAA, projecting daytime highs near 55-62°F under overcast conditions and periods of light precipitation, as steering patterns funneled chilly Canadian air southward. Trader consensus at 100% implied probability for "65°F or below" reflects this verified ASOS measurement data, with negligible risk of revision given standardized airport station protocols. Only an anomalous post-hoc data correction from NWS could challenge resolution, though historical precedents show such changes are rare for clear days. April normals hover near 63°F, underscoring the unseasonably cool conditions.
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 26 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
$26,657End Date
Apr 26, 2026Market Opened
Apr 24, 2026, 12:07 AM ETResolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...Outcome proposed: Yes
No dispute
Final outcome: Yes
Official National Weather Service observations at Chicago O'Hare International Airport (KORD) confirm the highest temperature on April 26, 2026, reached only 59°F around midday, well below the 65°F threshold amid persistent cloud cover, showers, and gusty winds from a cool air mass over the Midwest. This aligns with pre-event forecast model consensus from NOAA, projecting daytime highs near 55-62°F under overcast conditions and periods of light precipitation, as steering patterns funneled chilly Canadian air southward. Trader consensus at 100% implied probability for "65°F or below" reflects this verified ASOS measurement data, with negligible risk of revision given standardized airport station protocols. Only an anomalous post-hoc data correction from NWS could challenge resolution, though historical precedents show such changes are rare for clear days. April normals hover near 63°F, underscoring the unseasonably cool conditions.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
Beware of external links.
Beware of external links.
Frequently Asked Questions