Settlement stations / KORD

US · America/Chicago

Polymarket Chicago temperature: settles on KORD

KORD is O'Hare International, Chicago. Polymarket settles temperature contracts here. Below: the resolution source each venue names, when the station reports, and how long a reading takes to reach the public feed.

This city settles on two different stations

Polymarket uses KORD (O'Hare International). Kalshi settles the same city on KMDW (Midway International) instead. The two sites can report different temperatures at the same moment and land in different contract buckets on the same day, so a reading from one tells you nothing definitive about the other.

How it settles

VenueResolution sourceUnitBucketContracts
PolymarketNOAA station observations published by weather.gov
Source code KORD. The observation table is the same hourly report stream shown here, so the running high tracks it directly.		Fahrenheit2°Fhigh · low
highest-temperature-in-chicago, lowest-temperature-in-chicago

Reporting and delay

Regular reports:51:51 past each hour, UTC — 1 regular report per hour.
Median delay3.2 minFrom the observation time in the report to the public NOAA feed. 27 reports, measured 2026-09-16.
90th percentile3.2 minOne report in ten is at least this late. Worth knowing before you trust a quiet hour.
Coordinates41.960, -87.932Local civil time: America/Chicago

Questions

Which weather station settles Chicago temperature contracts?

Polymarket settles Chicago on KORD, O'Hare International. Kalshi settles the same city on KMDW, Midway International, which is a different site.

What is the resolution source for Polymarket Chicago temperature?

Polymarket names NOAA station observations published by weather.gov. Contracts settle in Fahrenheit on 2-degree buckets. The observation table is the same hourly report stream shown here, so the running high tracks it directly.

When does KORD report?

:51 past each hour, UTC — 1 regular report per hour.

How long does a KORD observation take to become public?

Measured over 26 hours on 2026-09-16, the median delay from the observation time in the report to its arrival on the public NOAA feed was 3.2 min, with a 90th percentile of 3.2 min across 27 reports. This moves with upstream conditions and is not a service level.

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WeatherTick tracks 67 settlement stations and publishes each day's running high and low already converted into the unit and bucket the contract settles in. Open the terminal for Chicago, or see every settlement station. Settlement always follows the resolution source named by the venue; the figures here are computed from the public feed and are not a settlement source.