Highest temperature in Atlanta on July 13?

Platform comparison

Market context

On 13 July 2026, the highest temperature recorded at Hartsfield-Jackson Atlanta International Airport will fall into one of several defined ranges. The market currently prices all temperature brackets at 0% probability on Polymarket, suggesting either technical settlement lag or genuine uncertainty about which range will resolve. Traders are staking USDC on Polygon against conditional tokens that pay out only if the day's peak temperature—as logged by Wunderground's historical weather database for KATL—lands within their chosen bracket.

Atlanta's July climate provides a useful baseline. Historical data shows mid-July highs typically range between 88–92°F, with occasional spikes above 95°F during heat domes. The city's urban heat island effect, combined with its latitude and summer humidity patterns, makes extreme outliers (sub-85°F or above 100°F) statistically unlikely but not impossible. Comparable July 13th records from prior years and the broader summer distribution inform how traders should weight probability across the available ranges.

The National Weather Service's seasonal forecasts and any Atlantic hurricane activity in early July 2026 could shift atmospheric conditions meaningfully. Traders monitoring tropical systems or upper-level ridge positioning in the days before settlement will have an edge, as these drivers determine whether Atlanta experiences typical summer heat or anomalous cooling. The settlement window closes at 12:00 UTC on 13 July, giving traders until that point to adjust positions based on real-time observations and intraday forecasts from meteorological sources.

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 Kalshi 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'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 Kalshi UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.