Latest National Weather Service guidance and GFS/ECMWF ensemble models project Chicago O'Hare's highest temperature on March 29 clustering near 62°F, aligning with trader consensus favoring 62-63°F at 26% implied probability over nearby 60-65°F bins amid inherent short-range forecast uncertainty. This above-normal outlook—exceeding the late-March climatological average of 49°F under neutral-to-weak La Niña conditions—stems from southerly winds advecting milder air beneath a developing upper-level ridge, a warmer trend solidified by yesterday's 12Z model runs following March 27-28's cooler 44-50°F readings. Differentiating factors include boundary-layer mixing efficiency and mid-level cloud cover: robust insolation with strong vertical mixing favors 64-65°F, while increased cloudiness or delayed warm advection tilts toward 60-61°F. Traders eye today's 00Z model updates for refinements before peak afternoon heating.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Chicago on March 29?
Highest temperature in Chicago on March 29?
62-63°F 26%
60-61°F 19%
64-65°F 19%
58-59°F 13%
$35,374 Vol.
$35,374 Vol.
53°F or below
<1%
54-55°F
1%
56-57°F
4%
58-59°F
13%
60-61°F
19%
62-63°F
26%
64-65°F
19%
66-67°F
11%
68-69°F
7%
70-71°F
3%
72°F or higher
1%
62-63°F 26%
60-61°F 19%
64-65°F 19%
58-59°F 13%
$35,374 Vol.
$35,374 Vol.
53°F or below
<1%
54-55°F
1%
56-57°F
4%
58-59°F
13%
60-61°F
19%
62-63°F
26%
64-65°F
19%
66-67°F
11%
68-69°F
7%
70-71°F
3%
72°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 25, 2026, 6:02 AM ET
Resolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...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.
Resolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...Latest National Weather Service guidance and GFS/ECMWF ensemble models project Chicago O'Hare's highest temperature on March 29 clustering near 62°F, aligning with trader consensus favoring 62-63°F at 26% implied probability over nearby 60-65°F bins amid inherent short-range forecast uncertainty. This above-normal outlook—exceeding the late-March climatological average of 49°F under neutral-to-weak La Niña conditions—stems from southerly winds advecting milder air beneath a developing upper-level ridge, a warmer trend solidified by yesterday's 12Z model runs following March 27-28's cooler 44-50°F readings. Differentiating factors include boundary-layer mixing efficiency and mid-level cloud cover: robust insolation with strong vertical mixing favors 64-65°F, while increased cloudiness or delayed warm advection tilts toward 60-61°F. Traders eye today's 00Z model updates for refinements before peak afternoon heating.
Experimental AI-generated summary referencing Polymarket data · Updated
Beware of external links.
Beware of external links.
Frequently Asked Questions