Highest temperature in Chicago on July 15?

Platform comparison

Market context

Chicago O’Hare recorded its peak July 15 temperature at 94–95°F last year, a figure that aligns with the current market frontrunner holding 47% probability, while 96–97°F sits at 35% [1]. The crowd-implied 0% probability for a “YES” outcome likely reflects a binary misunderstanding of the market’s resolution mechanics, which settle on a specific temperature range rather than a simple pass/fail condition. Historically, mid-July in Chicago frequently sees highs between 90°F and 98°F, with the 1995 heat wave serving as a severe outlier where temperatures breached 100°F for multiple days, creating a baseline for extreme scenarios traders must model programmatically [2].

A trader building a bot for this event should monitor the National Weather Service’s daily forecast schedules and Wunderground’s real-time hourly updates for KORD, the designated resolution source. The primary catalyst is the official daily high temperature release, which typically occurs shortly after midnight UTC on 16 July, but algorithmic models should also track heat advisory announcements and humidity indices that often push temperatures into the 96–97°F bracket. Recent coverage of scorching temperatures rivaling the 1995 event underscores the volatility of Chicago’s summer heat, suggesting that conditional orders should trigger on advisory thresholds rather than static temperature guesses [2]. Programmatic approaches must account for the 12:00 UTC settlement window, ensuring data ingestion completes before the market locks.

Sources: 1 · 2

Methodology

This page reviews Highest temperature in Chicago on July 15? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Bot UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Bot UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.