Trader consensus overwhelmingly favors a Chicago high of 70-71°F on March 20, driven by the latest National Weather Service forecasts and ensemble model runs from GFS and ECMWF, which converge on peak afternoon temperatures around 70°F under partly cloudy skies and light southerly winds. This positioning aligns with verified upper-air analyses showing a stable ridge aloft suppressing extremes, consistent with recent Midwest mild spells where deviations rarely exceed 2°F from guidance. Historical March data reinforces caution, as Chicago's average high is 45°F, making outliers like 78°F+ improbable without an anomalous warm front. Realistic challenges include an unexpected jet streak acceleration or clear-sky amplification, potentially lifting odds for 72°F+, but current analogs suggest under 1% risk.
Résumé expérimental généré par IA à partir des données Polymarket · Mis à jourHighest temperature in Chicago on March 20?
Highest temperature in Chicago on March 20?
70-71°F 99.9%
72-73°F <1%
74-75°F <1%
76-77°F <1%
$255,140 Vol.
$255,140 Vol.
70-71°F
100%
72-73°F
<1%
74-75°F
<1%
76-77°F
<1%
78°F or higher
<1%
70-71°F 99.9%
72-73°F <1%
74-75°F <1%
76-77°F <1%
$255,140 Vol.
$255,140 Vol.
70-71°F
100%
72-73°F
<1%
74-75°F
<1%
76-77°F
<1%
78°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.
Marché ouvert : Mar 16, 2026, 6:02 AM ET
Resolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...Resolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...Trader consensus overwhelmingly favors a Chicago high of 70-71°F on March 20, driven by the latest National Weather Service forecasts and ensemble model runs from GFS and ECMWF, which converge on peak afternoon temperatures around 70°F under partly cloudy skies and light southerly winds. This positioning aligns with verified upper-air analyses showing a stable ridge aloft suppressing extremes, consistent with recent Midwest mild spells where deviations rarely exceed 2°F from guidance. Historical March data reinforces caution, as Chicago's average high is 45°F, making outliers like 78°F+ improbable without an anomalous warm front. Realistic challenges include an unexpected jet streak acceleration or clear-sky amplification, potentially lifting odds for 72°F+, but current analogs suggest under 1% risk.
Résumé expérimental généré par IA à partir des données Polymarket · Mis à jour
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