National Weather Service observations confirm Chicago O'Hare International Airport—the official recording station—reached a record-breaking high of 80°F on March 30, 2026, surpassing the prior mark of 79°F set in 1986, driving the market's 100% implied probability for 76°F or higher. This extreme warmth stemmed from a potent ridge of high pressure ushering in late-May-like conditions with ample sunshine and minimal cloud cover, allowing peak afternoon heating amid southerly winds ahead of an incoming cold front. Trader consensus, backed by real capital, aligns with verified hourly data and final daily summaries, leaving negligible room for revision barring rare measurement discrepancies from instrument calibration issues. No further updates expected as the event has resolved.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Chicago on March 30?
Highest temperature in Chicago on March 30?
76°F or higher 100.0%
57°F or below <1%
58-59°F <1%
60-61°F <1%
$149,871 Vol.
$149,871 Vol.
57°F or below
No
58-59°F
No
60-61°F
No
62-63°F
No
64-65°F
No
66-67°F
No
68-69°F
No
70-71°F
No
72-73°F
No
74-75°F
No
76°F or higher
Yes
76°F or higher 100.0%
57°F or below <1%
58-59°F <1%
60-61°F <1%
$149,871 Vol.
$149,871 Vol.
57°F or below
No
58-59°F
No
60-61°F
No
62-63°F
No
64-65°F
No
66-67°F
No
68-69°F
No
70-71°F
No
72-73°F
No
74-75°F
No
76°F or higher
Yes
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, 2:12 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
National Weather Service observations confirm Chicago O'Hare International Airport—the official recording station—reached a record-breaking high of 80°F on March 30, 2026, surpassing the prior mark of 79°F set in 1986, driving the market's 100% implied probability for 76°F or higher. This extreme warmth stemmed from a potent ridge of high pressure ushering in late-May-like conditions with ample sunshine and minimal cloud cover, allowing peak afternoon heating amid southerly winds ahead of an incoming cold front. Trader consensus, backed by real capital, aligns with verified hourly data and final daily summaries, leaving negligible room for revision barring rare measurement discrepancies from instrument calibration issues. No further updates expected as the event has resolved.
Experimental AI-generated summary referencing Polymarket data · Updated
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