Highest temperature in Seoul on June 20?

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Market context

Seoul’s hottest reading on 20 June is usually an early-summer outcome rather than an extreme one, with June climatology for the city typically sitting around **19 to 28°C** and the month marking the build-up to the monsoon rather than peak heat[1]. That makes the market’s current **0% YES** print look like a pricing artefact rather than a strong weather view: the contract resolves off the **Incheon Intl Airport Station** daily high on Wunderground, not a broader Seoul-wide average, so a single warm or cloudy afternoon can still matter more than city-level headlines suggest.

The main historical frame is that June in South Korea is often warm, humid, and changeable, while truly exceptional heat is uncommon but not impossible; Seoul has occasionally seen record-setting June highs in the mid-30s Celsius[7]. For a settlement window ending at 12:00 UTC, the relevant move is the local daytime maximum at Incheon, so traders should watch the Korea Meteorological Administration short-range guidance and the airport-area cloud, rain, and wind evolution through the morning and early afternoon[4][6]. Those near-term forecasts matter more than monthly norms, because a coastal airport site can run cooler than central Seoul when sea breezes or showers develop.

On the crypto side, this is a simple **USDC-settled** weather binary, so pricing usually reflects event-specific probability rather than BTC or ETH beta unless broader risk sentiment is driving venue liquidity. If crypto markets are stressed, that can tighten books and exaggerate the odds of an outsized move in either direction, but the underlying settlement still depends only on the observed airport temperature on Wunderground[market description].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Seoul on June 20? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed for comparison. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

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 it cost to trade on BTC Prediction?

Zero. BTC Prediction routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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, BTC Prediction triggers a quick verification flow that finishes in minutes.