Highest temperature in NYC on July 22?

Platform comparison

Market context

New York City’s highest temperature on 22 July is the key settlement print, taken from LaGuardia Airport Station on Wunderground, and the market stays open until the first data point for the following day appears on the source.[1] In practical terms, that means the result is driven by the daily maximum at a single station rather than by any citywide average, so late-day warmth, a short-lived heat spike, or an airport-specific reading can matter more than the broader “New York weather” headline.[1]

The current 0% yes price looks aggressive against July climatology: NYC typically sees warm, humid conditions in midsummer, with July highs around 30°C and average temperatures rising towards the end of the month.[2] For comparison, Polymarket displays the market as implied probability, while Kalshi and Betfair-style books typically show decimal prices/odds, so the same view can look flatter or more stretched depending on the venue. Fee structure and access also differ: Polymarket is crypto-native, whereas regulated venues usually impose fiat KYC and may present tighter withdrawal and participation limits, which can affect how quickly weather risk is repriced.

The main catalysts are the actual forecast trend into the 22nd, any heat advisories or thunderstorm risk in the New York metro area, and the exact hourly evolution at LaGuardia rather than Central Park or JFK. Traders should watch for changes in the National Weather Service outlook and airport-adjacent temperature forecasts, because a marginal shift of a few degrees can move the day’s maximum into a different resolution band. If the setup points to persistent cloud cover or onshore flow, the market may stay subdued; if forecasters begin flagging a hot, dry afternoon, the odds can re-rate quickly even before the calendar date itself.

Sources: 1 · 2

Methodology

We read Highest temperature in NYC on July 22? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

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.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

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