Highest temperature in NYC on August 16?

Platform comparison

Market context

LaGuardia Airport's highest temperature on 16 August 2026 will be recorded in the Daily Observations table on Weather Underground and resolved to the nearest temperature bracket. The settlement window closes at 12:00 UTC on that date, with USDC payouts distributed to holders of the correct range contract. Resolution depends on the primary data source—the granular observations table rather than the summary high-low figures—a distinction that has historically created discrepancies of 1–3 degrees Fahrenheit in edge cases.

New York's mid-August climate typically produces highs between 82 and 88 degrees Fahrenheit, with extreme heat events (above 95°F) occurring roughly once per decade. The 0% crowd probability suggests traders are pricing in either a very narrow or very high temperature range as the correct outcome. Historical August data from LaGuardia shows that sustained heat waves correlate with Atlantic high-pressure systems that persist for 5–7 days; isolated single-day spikes above 90°F are less common than sustained warm periods. The 2019 and 2022 heat waves both produced multiple consecutive days above 90°F rather than isolated peaks.

Traders should monitor the North Atlantic Oscillation (NAO) index and medium-range ensemble forecasts from the National Weather Service from early August onwards. Funding rates on temperature-sensitive derivatives across major crypto exchanges have shown mild correlation with seasonal volatility expectations, though direct hedging instruments remain limited. Any tropical system tracking toward the Northeast in mid-August would materially shift probability distributions; current climate models for summer 2026 show no exceptional anomaly signals, keeping outcomes anchored to historical norms.

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%.