Highest temperature in Dallas on July 22?

Platform comparison

Market context

Dallas’s 22 July high at Love Field is being priced as an extreme-heat outcome, with the leading contract range at **108-109°F** on Polymarket and the rest of the ladder effectively dismissed. That implies a sharp divergence from the crowd-implied **0% YES** on any alternative lower band, but it is not unusual for temperature markets to concentrate heavily once forecasts point to a sustained heat dome rather than an ordinary summer afternoon.[1]

Historically, Dallas midsummer highs often cluster in the upper 90s to low 100s, so a finish in the 108-109°F band would sit at the hot end of the distribution rather than an everyday outcome. For traders, the key comparison is that the market is not pricing a broad range of possibilities so much as a single dominant bucket, which typically happens when short-range weather models converge and leave little room for surprise unless cloud cover, storms, or a late shift in the air mass materially cools the city before the station’s daily high is recorded.[1]

The main catalysts to watch are the National Weather Service forecast updates, any heat advisories or excessive heat warnings for North Texas, and the evolution of afternoon thunderstorm chances, since these can cap the day’s maximum temperature even after a hot morning start. In practical terms, the contract will turn on how high Dallas Love Field actually gets before the daily peak is fixed on Wunderground, so late forecast revisions matter more than broad seasonal averages once the market has already moved to a single favoured band.[1]

Sources: 1

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets 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.