Highest temperature in NYC on July 30?

Platform comparison

Market context

New York City’s July temperature markets are usually decided by a short late-July heat spell rather than by an all-summer average, because the official reading can spike sharply when the region sits under a heat dome. LaGuardia’s July 30 record is not a daily norm: recent monthly guides show highs in the mid-to-upper 80s Fahrenheit, while the city’s broader July history includes occasional 100F-plus extremes at official stations.[1][3][10]

That is why a 0% crowd-implied chance for the top temperature range looks like a statement about the day’s expected ceiling, not about the month as a whole. Comparable New York heat events have repeatedly been tied to brief bursts of extreme heat, including the city’s first 100F Central Park reading since 2012 earlier this month, and LaGuardia has its own historic peak of 107F on 3 July 1966, underscoring that the airport can run hotter than Central Park on the right synoptic setup.[16][6][14]

For traders, the key catalyst is any late-week heat advisory, temperature guidance, or forecast shift that would move LaGuardia towards or away from the upper 80s and 90s before the settlement window closes. The National Weather Service’s New York climate and forecast products, together with daily station histories, are the relevant references for reading whether a hot ridge, onshore flow, or scattered storms become the dominant driver; recent reporting from the city’s 100F day this month showed how quickly official airport readings can confirm or rule out the upper end of the distribution.[4][16]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in NYC on July 30? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. For users geo-blocked from Polymarket directly, brokers like Election Predictions UK provide a 0%-fee route into the same order book.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

Are political prediction markets legal in my country?

It varies. They sit in legal gray areas in most jurisdictions. Polymarket is geo-blocked from US/UK/EU; some broker frontends have a different geo footprint. Trade only with capital you can afford to lose, and only if you understand the legal status in your jurisdiction.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.