Highest temperature in NYC on August 14?

Platform comparison

Market context

August 14 at LaGuardia is the settlement date, and the contract keys off the highest reading in Weather Underground’s Daily Observations rather than the summary high, so the final print depends on the precise hourly trace through the day. Current conditions at LaGuardia were already in the low-to-mid 80s on 14 August, with the National Weather Service noting a mostly cloudy 82°F late in the afternoon and Wunderground showing 70°F by early evening, which suggests the intraday high had likely already been set[5][7].

The 0% implied probability reflects how hard it is to pin a single exact temperature band on a live weather market once the relevant day is in progress, especially when the resolution source is a station-specific log that can differ from headline forecasts. LaGuardia’s climatological normal maximum for 14 August is 85°F, with a recorded record of 98°F, so a mid-80s outcome sits close to the seasonal centre rather than at an extreme[1]. Recent New York coverage had also described a heat spell earlier in the month, with forecasters warning of 90s and humidity, then a late-week cool-down, which fits a market that can move sharply on a modest shift in cloud cover, wind, or showers[4][10].

Traders should watch the final station observations, any late-afternoon convection near the airport, and whether the daily table receives revisions before the settlement window closes. Because the market is USDC-settled on-chain, the practical risk is not macro crypto beta but the final meteorological print; however, BTC and ETH risk-on or risk-off moves can still affect liquidity, spread width, and participation around weather contracts. The key dependency is the continuity of the LaGuardia observation feed into the next day’s first datapoint, since that governs whether the highest reading is treated as final.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

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.

UK Frequently Asked Questions

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.