Trader consensus on Chicago's March 21 high temperature clusters tightly around 72-77°F, driven by major weather models like NOAA's GFS and ECMWF ensembles projecting peak warmth from a potent upper-level ridge advecting Gulf-sourced air masses northward under clear skies. The edge for 74-75°F (43.5%) over 72-73°F (35.9%) stems from recent 00z runs showing enhanced boundary-layer warming and reduced cloud cover, per NWS guidance targeting 74°F at O'Hare. Differentiating factors include model physics variances—GFS's aggressive downslope enhancement versus ECMWF's tempered mixing—plus urban heat island effects peaking mid-afternoon. Odds beyond 77°F remain slim without prolonged insolation, well above the 46°F March norm amid low ensemble spread. Watch 12z updates for shifts.
Résumé expérimental généré par IA à partir des données Polymarket · Mis à jourHighest temperature in Chicago on March 21?
Highest temperature in Chicago on March 21?
74-75°F 39.0%
72-73°F 34.7%
76-77°F 14.6%
70-71°F 12%
$149,068 Vol.
$149,068 Vol.
59°F or below
<1%
60-61°F
<1%
62-63°F
<1%
64-65°F
<1%
66-67°F
<1%
68-69°F
<1%
70-71°F
12%
72-73°F
35%
74-75°F
39%
76-77°F
15%
78°F or higher
3%
74-75°F 39.0%
72-73°F 34.7%
76-77°F 14.6%
70-71°F 12%
$149,068 Vol.
$149,068 Vol.
59°F or below
<1%
60-61°F
<1%
62-63°F
<1%
64-65°F
<1%
66-67°F
<1%
68-69°F
<1%
70-71°F
12%
72-73°F
35%
74-75°F
39%
76-77°F
15%
78°F or higher
3%
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 17, 2026, 6:02 AM ET
Resolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...Résultat proposé: No
Fenêtre de contestation
Final
Resolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...Trader consensus on Chicago's March 21 high temperature clusters tightly around 72-77°F, driven by major weather models like NOAA's GFS and ECMWF ensembles projecting peak warmth from a potent upper-level ridge advecting Gulf-sourced air masses northward under clear skies. The edge for 74-75°F (43.5%) over 72-73°F (35.9%) stems from recent 00z runs showing enhanced boundary-layer warming and reduced cloud cover, per NWS guidance targeting 74°F at O'Hare. Differentiating factors include model physics variances—GFS's aggressive downslope enhancement versus ECMWF's tempered mixing—plus urban heat island effects peaking mid-afternoon. Odds beyond 77°F remain slim without prolonged insolation, well above the 46°F March norm amid low ensemble spread. Watch 12z updates for shifts.
Résumé expérimental généré par IA à partir des données Polymarket · Mis à jour
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