Latest National Weather Service and NOAA forecast models for Chicago project the March 27 high temperature in the low-to-mid 40s°F range, fueling trader consensus around 40-41°F (27.5% implied probability) and 42-43°F (24.5%), with close competition reflecting ensemble spread of 3-5°F across GFS and ECMWF runs. Recent 00Z model updates yesterday incorporated a building high-pressure ridge over the Great Lakes, nudging peaks slightly warmer to 41-44°F amid light northerly winds and partial cloud cover, while cooler 38-39°F odds (9.5%) account for potential overcast persistence or delayed boundary-layer mixing. Differentiating factors include model disagreements on afternoon insolation and cold-air advection timing; new 12Z forecasts due within hours could sharpen the outlook before observational data resolves the market.
Résumé expérimental généré par IA à partir des données Polymarket · Mis à jourHighest temperature in Chicago on March 27?
Highest temperature in Chicago on March 27?
40-41°F 28%
42-43°F 23%
44-45°F 16.0%
38-39°F 9%
$38,602 Vol.
$38,602 Vol.
33°F or below
1%
34-35°F
3%
36-37°F
7%
38-39°F
9%
40-41°F
28%
42-43°F
23%
44-45°F
16%
46-47°F
9%
48-49°F
3%
50-51°F
2%
52°F or higher
2%
40-41°F 28%
42-43°F 23%
44-45°F 16.0%
38-39°F 9%
$38,602 Vol.
$38,602 Vol.
33°F or below
1%
34-35°F
3%
36-37°F
7%
38-39°F
9%
40-41°F
28%
42-43°F
23%
44-45°F
16%
46-47°F
9%
48-49°F
3%
50-51°F
2%
52°F or higher
2%
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 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...Latest National Weather Service and NOAA forecast models for Chicago project the March 27 high temperature in the low-to-mid 40s°F range, fueling trader consensus around 40-41°F (27.5% implied probability) and 42-43°F (24.5%), with close competition reflecting ensemble spread of 3-5°F across GFS and ECMWF runs. Recent 00Z model updates yesterday incorporated a building high-pressure ridge over the Great Lakes, nudging peaks slightly warmer to 41-44°F amid light northerly winds and partial cloud cover, while cooler 38-39°F odds (9.5%) account for potential overcast persistence or delayed boundary-layer mixing. Differentiating factors include model disagreements on afternoon insolation and cold-air advection timing; new 12Z forecasts due within hours could sharpen the outlook before observational data resolves the market.
Résumé expérimental généré par IA à partir des données Polymarket · Mis à jour
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