Highest temperature in Atlanta on August 1?

Platform comparison

Market context

Polymarket is pricing this Atlanta airport temperature contract at 0% for **YES**, so the market is effectively saying the current distribution across Fahrenheit bands leaves no meaningful chance on the specific outcome the contract resolves to. On Polymarket, traders still hold **conditional tokens** on Polygon and settle in **USDC**, so the live price is the crowd’s view of the exact high at Hartsfield-Jackson on 1 August rather than a generic call on “hot” or “cool” weather.[2]

For context, Atlanta’s early-August climate normally sits in the upper 80s Fahrenheit, with the city’s August 1 record high listed at **99°F** and the broader August record at **104°F**, which shows that materially hotter readings are possible even if they are not typical.[1] Recent summer climate summaries from the National Weather Service also show Atlanta reaching **100°F** in summer 2024, so a low-probability tail for 90s-plus heat remains part of how traders should read the book.[11]

The main catalysts are the same ones weather traders watch every summer: the latest forecast package, afternoon thunderstorm coverage, cloud timing, and any shift in onshore moisture or weak fronts that changes how much solar heating the airport sees. In the Polymarket market itself, revisions to temperatures recorded within the settlement window are counted until the first datapoint for the following date is published, so late updates from Wunderground matter if the highest reading is adjusted after the fact.[2] Atlanta media forecasts have also been pointing to a modest summer pattern rather than a one-way heat surge, which keeps the distribution sensitive to small forecast changes rather than a single dominant scenario.[16]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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 PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

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.

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.