Trader consensus on Polymarket reflects tight forecast uncertainty for Chicago's highest temperature on March 27, with models clustering around 40-43°F amid a cool post-frontal air mass. National Weather Service guidance and ensemble means from GFS and ECMWF indicate a peak near 41-42°F under partly cloudy skies, light northwest winds around 10 mph, and highs limited by shallow boundary layer mixing. The narrow spread between 40-41°F (26%) and 42-43°F (26.5%) stems from model disagreements on exact timing of diurnal heating and thin high cloud cover, with Euro leaning slightly cooler and GFS warmer. New 12z model runs expected midday could refine this, as historical late-March normals hover near 42°F but vary with synoptic patterns.
Resumo experimental gerado por IA com dados do Polymarket · AtualizadoHighest temperature in Chicago on March 27?
Highest temperature in Chicago on March 27?
42-43°F 30%
40-41°F 29%
44-45°F 13.6%
38-39°F 13%
$28,188 Vol.
$28,188 Vol.
33°F or below
2%
34-35°F
3%
36-37°F
10%
38-39°F
13%
40-41°F
29%
42-43°F
30%
44-45°F
14%
46-47°F
10%
48-49°F
3%
50-51°F
1%
52°F or higher
1%
42-43°F 30%
40-41°F 29%
44-45°F 13.6%
38-39°F 13%
$28,188 Vol.
$28,188 Vol.
33°F or below
2%
34-35°F
3%
36-37°F
10%
38-39°F
13%
40-41°F
29%
42-43°F
30%
44-45°F
14%
46-47°F
10%
48-49°F
3%
50-51°F
1%
52°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.
Mercado Aberto: Mar 23, 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 reflects tight forecast uncertainty for Chicago's highest temperature on March 27, with models clustering around 40-43°F amid a cool post-frontal air mass. National Weather Service guidance and ensemble means from GFS and ECMWF indicate a peak near 41-42°F under partly cloudy skies, light northwest winds around 10 mph, and highs limited by shallow boundary layer mixing. The narrow spread between 40-41°F (26%) and 42-43°F (26.5%) stems from model disagreements on exact timing of diurnal heating and thin high cloud cover, with Euro leaning slightly cooler and GFS warmer. New 12z model runs expected midday could refine this, as historical late-March normals hover near 42°F but vary with synoptic patterns.
Resumo experimental gerado por IA com dados do Polymarket · Atualizado
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