Highest temperature in Atlanta on July 13?

Platform comparison

Market context

Atlanta's daily high temperature on 13 July 2026 will be recorded at Hartsfield-Jackson International Airport, the official weather station for the city. The settlement mechanism pulls directly from Wunderground's historical data archive for that specific station and date, making the outcome verifiable and non-contestable once the day passes. The market resolves to whichever temperature bracket contains the highest reading recorded across all times on that calendar day.

Historical July temperatures at KATL cluster reliably between 88–94°F for daily highs, with extreme outliers above 96°F occurring roughly once per decade during heat domes. The 0% crowd probability suggests traders are either waiting for more granular forecast data closer to the settlement window or treating this as a calibration test. Comparable markets on Atlanta summer temperatures have typically seen meaningful movement only within 10–14 days of the target date, when numerical weather prediction models stabilise their confidence intervals.

Traders automating this market should monitor the National Weather Service's 8–14 day outlook for the Southeast, which updates twice weekly and flags anomalous heat patterns. The Climate Prediction Center's temperature departure forecasts, published Thursdays, will be the primary catalyst for repricing. Conditional order logic should account for the fact that a single day's high is less volatile than multi-day averages, reducing the utility of early-window hedging strategies. Data feeds from Wunderground's API can be queried programmatically post-settlement to confirm the exact recorded value within minutes of the midnight UTC cutoff.

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

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

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 Polymarket Bot 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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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.