Trader consensus on Polymarket heavily favors a Chicago high temperature of 44-45°F at 26.5% implied probability, edging out 42-43°F at 24.5%, driven by the latest NOAA Weather Prediction Center guidance and NWS Chicago forecast models projecting a daytime peak near 44°F under partly cloudy skies with light southerly winds. Ensemble forecasts from GFS and ECMWF show a tight spread of 42-47°F, differentiated by minor variations in boundary layer mixing and cloud cover persistence from an approaching warm front, which could shave 1-2°F off peaks if thicker clouds develop. Historical March 23 averages hover around 43°F, amplifying sensitivity to today's 12z model updates expected by evening, where any northward shift in the frontal boundary tips odds toward the upper range.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Chicago on March 23?
Highest temperature in Chicago on March 23?
44-45°F 25%
42-43°F 24%
46-47°F 17.5%
40-41°F 13%
$16,148 Vol.
$16,148 Vol.
35°F or below
1%
36-37°F
3%
38-39°F
5%
40-41°F
13%
42-43°F
24%
44-45°F
25%
46-47°F
18%
48-49°F
8%
50-51°F
3%
52-53°F
2%
54°F or higher
1%
44-45°F 25%
42-43°F 24%
46-47°F 17.5%
40-41°F 13%
$16,148 Vol.
$16,148 Vol.
35°F or below
1%
36-37°F
3%
38-39°F
5%
40-41°F
13%
42-43°F
24%
44-45°F
25%
46-47°F
18%
48-49°F
8%
50-51°F
3%
52-53°F
2%
54°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.
Market Opened: Mar 19, 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 on Polymarket heavily favors a Chicago high temperature of 44-45°F at 26.5% implied probability, edging out 42-43°F at 24.5%, driven by the latest NOAA Weather Prediction Center guidance and NWS Chicago forecast models projecting a daytime peak near 44°F under partly cloudy skies with light southerly winds. Ensemble forecasts from GFS and ECMWF show a tight spread of 42-47°F, differentiated by minor variations in boundary layer mixing and cloud cover persistence from an approaching warm front, which could shave 1-2°F off peaks if thicker clouds develop. Historical March 23 averages hover around 43°F, amplifying sensitivity to today's 12z model updates expected by evening, where any northward shift in the frontal boundary tips odds toward the upper range.
Experimental AI-generated summary referencing Polymarket data · Updated
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