Highest temperature in NYC on July 20?

Platform comparison

Market context

A July heatwave across the East Coast last week shattered records that had stood for up to 154 years, with New York City, Washington DC and Atlantic City all hitting unprecedented highs during the holiday weekend [3]. This recent surge in extreme temperatures provides a stark contrast to the market’s current 0% probability for any outcome above the frontrunner range of 82–83°F, which the market assigns a 100% chance of occurring [1]. Historically, mid-July in NYC sees average highs near 84°F, but the 2026 event suggests a potential upward shift in the baseline, making the current crowd-implied certainty of a modest peak appear fragile against the backdrop of confirmed record-breaking activity.

Traders should monitor daily Wunderground updates for LaGuardia Airport as the settlement window closes on 20 July 2026, since the market resolves strictly on the highest temperature recorded at that station [1]. While no scheduled political debates or campaign-finance disclosures directly influence weather, the broader context of the 2026 heatwave—described as a simultaneous 500-mile corridor event—acts as the primary catalyst for re-evaluating the 0% probability assigned to higher ranges [3]. The market is currently leaning on the assumption that the recent record-breakers were isolated anomalies, but if the heatwave persists or intensifies toward 20 July, the implied probability for ranges above 83°F could shift rapidly, especially given the historical precedent of sustained East Coast extremes in recent days.

Sources: 1 · 2 · 3

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in NYC on July 20? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

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.