Highest temperature in NYC on July 1?

Platform comparison

Market context

On 1 July 2026, the highest temperature recorded at LaGuardia Airport in New York City will determine the outcome of a prediction market where the crowd currently assigns zero probability to any specific range. This event hinges on real-world weather conditions at a major coastal airport, with resolution sourced from Wunderground’s daily high for KLGA. The market’s 0% YES probability suggests traders believe the outcome is either impossible to predict or that the range in question is wildly inconsistent with historical norms, though early July in NYC typically sees highs between 81°F and 99°F.

Historical data frames this probability: LaGuardia’s July 2026 forecast anticipates daily highs from 81°F to 99°F, with a climate normal maximum of 85°F and a record of 100°F set in 2021. Recent similar markets, such as the June 27 event, resolved to 78–79°F, while a June 1 market remains unsettled. Platforms diverge sharply here: Polymarket uses decimal odds and minimal KYC, whereas Kalshi and Betfair rely on implied probability and stricter identity checks, with fee structures varying from 0% to 2%. These differences affect liquidity and pricing efficiency for temperature-based contracts.

Traders should monitor the National Weather Service’s latest briefing for KOKX, which flagged extreme heat warnings and red weather alerts for Wednesday, 1 July, alongside scattered storms and rapid temperature swings in the Northeast. A recent YouTube weather update noted warm, humid air mixing with cooler winds, creating strong storm cells and potential travel delays. The Southwest faces near-record heat, but the Northeast’s volatility is the key catalyst. Watch for real-time Wunderground updates as the settlement window closes at 12:00 UTC on 1 July 2026, where any deviation from the 81–99°F range could invalidate the 0% crowd assumption.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in NYC on July 1? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.