Trader sentiment for Chicago's March 21 high temperature splits evenly between mild 66-67°F (21%) and cooler 59°F or below (20%), driven by divergent ensemble forecasts from NOAA's GFS and ECMWF models amid volatile early spring patterns. GFS runs imply a strengthening ridge aloft pushing highs toward the mid-60s with light southerly flow, while ECMWF favors lingering cool Canadian air masses, capping peaks nearer 55°F—exacerbated by Chicago's urban heat island effect amplifying small forecast differences. Recent 12z model updates show increasing spread in probabilistic outputs, with climatological baselines (March 21 average ~48°F) underscoring the 70% chance of above-normal temps per NOAA CPC outlooks, yet shortwave trough risks temper optimism for 70°F+. Traders eye evening NWS updates for resolution clarity.
Resumen experimental generado por IA con datos de Polymarket · ActualizadoHighest temperature in Chicago on March 21?
Highest temperature in Chicago on March 21?
59°F or below 20%
66-67°F 18%
68-69°F 16%
70-71°F 15%
59°F or below
20%
60-61°F
6%
62-63°F
10%
64-65°F
11%
66-67°F
18%
68-69°F
16%
70-71°F
15%
72-73°F
13%
74-75°F
8%
76-77°F
3%
78°F or higher
2%
59°F or below 20%
66-67°F 18%
68-69°F 16%
70-71°F 15%
59°F or below
20%
60-61°F
6%
62-63°F
10%
64-65°F
11%
66-67°F
18%
68-69°F
16%
70-71°F
15%
72-73°F
13%
74-75°F
8%
76-77°F
3%
78°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.
Mercado abierto: Mar 17, 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 sentiment for Chicago's March 21 high temperature splits evenly between mild 66-67°F (21%) and cooler 59°F or below (20%), driven by divergent ensemble forecasts from NOAA's GFS and ECMWF models amid volatile early spring patterns. GFS runs imply a strengthening ridge aloft pushing highs toward the mid-60s with light southerly flow, while ECMWF favors lingering cool Canadian air masses, capping peaks nearer 55°F—exacerbated by Chicago's urban heat island effect amplifying small forecast differences. Recent 12z model updates show increasing spread in probabilistic outputs, with climatological baselines (March 21 average ~48°F) underscoring the 70% chance of above-normal temps per NOAA CPC outlooks, yet shortwave trough risks temper optimism for 70°F+. Traders eye evening NWS updates for resolution clarity.
Resumen experimental generado por IA con datos de Polymarket · Actualizado
Cuidado con los enlaces externos.
Cuidado con los enlaces externos.
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