Highest temperature in Atlanta on May 22?

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Market context

Atlanta’s maximum temperature on 22 May will be set by the Hartsfield-Jackson International Airport station, with the market resolving against the highest reading logged before the observation day is finalised. The latest NWS climate summary showed a maximum of 88°F already recorded by early afternoon, which immediately makes the lower temperature bands harder to justify and explains why the market has moved towards the upper end of the range. With the settlement window ending at 12:00 UTC, traders are effectively leaning on the same day’s realised airport observation rather than a later revised forecast.

Historically, late-May heat in Atlanta is common but not extreme: average highs sit around the low 80s, and the city’s warmest May readings can push into the low to mid-90s, although those are outliers. Forecasts for this date earlier in the day had suggested the low-to-mid 80s under cloudy skies, but the realised maximum at the airport has already run hotter than that guidance. That matters because even a brief spike above 88°F would settle the market into the next band, while a final official high below that level would keep the result closer to the forecast range and the climate norm.

What traders should watch next is whether the airport station’s final daily report is amended or confirmed by the National Weather Service and then mirrored in Wunderground’s history page, since the market resolves from that source. The key dependency is whether the day’s peak was truly capped where the early report indicated, or whether a later reading edged higher before observations closed. Any updated airport observation, plus the final Wunderground daily high, is the decisive data point rather than citywide forecasts or nearby stations.

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Methodology

This page reviews Highest temperature in Atlanta on May 22? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.

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.