Trader consensus on Polymarket has locked in 100% implied probability for a 68-69°F high in Chicago on April 27, driven by official National Weather Service observations at O'Hare International Airport (KORD), the resolution station, which recorded a maximum temperature of 68°F at 5:51 PM local time. This measurement from the automated surface observing system aligns with post-event data releases confirming partly cloudy skies, windy conditions with gusts to 36 mph, and no precipitation, slightly above the climatological average high of around 64°F for late April. While final daily climatological summaries rarely revise ASOS readings, a realistic challenge could arise from an official data audit uncovering sensor issues or quality control adjustments, though such corrections are exceedingly uncommon after initial validation.
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 27?
Highest temperature in Chicago on April 27?
68-69°F 100.0%
53°F or below <1%
54-55°F <1%
56-57°F <1%
$261,847 Vol.
$261,847 Vol.
Apr 27, 2026
53°F or below
No
54-55°F
No
56-57°F
No
58-59°F
No
60-61°F
No
62-63°F
No
64-65°F
No
66-67°F
No
68-69°F
Yes
70-71°F
No
72°F or higher
No
68-69°F 100.0%
53°F or below <1%
54-55°F <1%
56-57°F <1%
$261,847 Vol.
$261,847 Vol.
Apr 27, 2026
53°F or below
$29,589 Vol.
No
54-55°F
$2,740 Vol.
No
56-57°F
$38,299 Vol.
No
58-59°F
$30,455 Vol.
No
60-61°F
$30,077 Vol.
No
62-63°F
$20,607 Vol.
No
64-65°F
$20,304 Vol.
No
66-67°F
$23,385 Vol.
No
68-69°F
$35,531 Vol.
Yes
70-71°F
$15,401 Vol.
No
72°F or higher
$15,460 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 27 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.Trader consensus on Polymarket has locked in 100% implied probability for a 68-69°F high in Chicago on April 27, driven by official National Weather Service observations at O'Hare International Airport (KORD), the resolution station, which recorded a maximum temperature of 68°F at 5:51 PM local time. This measurement from the automated surface observing system aligns with post-event data releases confirming partly cloudy skies, windy conditions with gusts to 36 mph, and no precipitation, slightly above the climatological average high of around 64°F for late April. While final daily climatological summaries rarely revise ASOS readings, a realistic challenge could arise from an official data audit uncovering sensor issues or quality control adjustments, though such corrections are exceedingly uncommon after initial validation.
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 27 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 25, 2026, 12:10 AM ET
Volume
$261,847End Date
Apr 27, 2026Market Opened
Apr 25, 2026, 12:10 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 27 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.Trader consensus on Polymarket has locked in 100% implied probability for a 68-69°F high in Chicago on April 27, driven by official National Weather Service observations at O'Hare International Airport (KORD), the resolution station, which recorded a maximum temperature of 68°F at 5:51 PM local time. This measurement from the automated surface observing system aligns with post-event data releases confirming partly cloudy skies, windy conditions with gusts to 36 mph, and no precipitation, slightly above the climatological average high of around 64°F for late April. While final daily climatological summaries rarely revise ASOS readings, a realistic challenge could arise from an official data audit uncovering sensor issues or quality control adjustments, though such corrections are exceedingly uncommon after initial validation.
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 27 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
$261,847End Date
Apr 27, 2026Market Opened
Apr 25, 2026, 12:10 AM ETResolution 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 100% implied probability for a 68-69°F high in Chicago on April 27, driven by official National Weather Service observations at O'Hare International Airport (KORD), the resolution station, which recorded a maximum temperature of 68°F at 5:51 PM local time. This measurement from the automated surface observing system aligns with post-event data releases confirming partly cloudy skies, windy conditions with gusts to 36 mph, and no precipitation, slightly above the climatological average high of around 64°F for late April. While final daily climatological summaries rarely revise ASOS readings, a realistic challenge could arise from an official data audit uncovering sensor issues or quality control adjustments, though such corrections are exceedingly uncommon after initial validation.
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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