Trader consensus overwhelmingly favors a Chicago high of 24-25°F on March 17, anchored by the National Weather Service's latest forecast projecting exactly 24°F amid a deep arctic air mass from a lingering polar vortex influence over the Midwest. Ensemble models like GFS and ECMWF ensembles converge on this range, with 00Z runs showing 500mb temperatures 2-3 standard deviations below March climatology, validated by current radiosonde observations. Northwest winds at 10-15 mph will reinforce the chill, consistent with historical cold outbreaks in mid-March occurring in about 15-20% of years. A realistic upset would require an abrupt shortwave ridge to advect unseasonably warm air aloft, but current model spread indicates under 5% odds for deviations beyond 26°F.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Chicago on March 17?
Highest temperature in Chicago on March 17?
24-25°F 100.0%
13°F or below <1%
14-15°F <1%
16-17°F <1%
$140,129 Vol.
$140,129 Vol.
13°F or below
No
14-15°F
No
16-17°F
No
18-19°F
No
20-21°F
No
22-23°F
No
24-25°F
Yes
26-27°F
No
28-29°F
No
30-31°F
No
32°F or higher
No
24-25°F 100.0%
13°F or below <1%
14-15°F <1%
16-17°F <1%
$140,129 Vol.
$140,129 Vol.
13°F or below
No
14-15°F
No
16-17°F
No
18-19°F
No
20-21°F
No
22-23°F
No
24-25°F
Yes
26-27°F
No
28-29°F
No
30-31°F
No
32°F or higher
No
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 13, 2026, 3:27 PM 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 overwhelmingly favors a Chicago high of 24-25°F on March 17, anchored by the National Weather Service's latest forecast projecting exactly 24°F amid a deep arctic air mass from a lingering polar vortex influence over the Midwest. Ensemble models like GFS and ECMWF ensembles converge on this range, with 00Z runs showing 500mb temperatures 2-3 standard deviations below March climatology, validated by current radiosonde observations. Northwest winds at 10-15 mph will reinforce the chill, consistent with historical cold outbreaks in mid-March occurring in about 15-20% of years. A realistic upset would require an abrupt shortwave ridge to advect unseasonably warm air aloft, but current model spread indicates under 5% odds for deviations beyond 26°F.
Experimental AI-generated summary referencing Polymarket data · Updated
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