Weather FAQs - Polymarket US Documentation

General Rules

What kinds of Weather Contracts are offered?

Polymarket US offers Temperature Contracts — Event Contracts that resolve based on whether the temperature in a specified location during a specified period satisfies a specified condition relative to a specified value.

How are Weather Contracts settled?

Settlement is determined by the official NWS Daily Climate Report (CLI) published by the local Weather Forecast Office. The CLI is an official government record that reports observed high, low, and average temperatures for a given location and date. The settlement source for each currently offered city is:

City	Station	CLI Source
New York City	KNYC (Central Park)	CLINYC
San Francisco	KSFO (San Francisco International Airport)	CLISFO
Miami	KMIA (Miami International Airport)	CLIMIA
Chicago	KMDW (Chicago Midway Airport)	CLIMDW
Los Angeles	KLAX (Los Angeles International Airport)	CLILAX

When does settlement occur?

Settlement occurs at 8:00 AM ET on the day following the Contract’s specified date. If the CLI reading is inconsistent with the 24-hour METAR observation for the same location, settlement may be delayed until 11:00 AM ET for review. If no data is published within one week of the scheduled release, the Contract settles at last fair market prices.