Where will 2026 rank among the hottest years on record?

Platform comparison

Market context

Global temperatures in 2026 are tracking to remain near record highs, with the World Meteorological Organization forecasting an 86% probability that one year between 2026 and 2030 will surpass 2024 as the hottest on record [1]. Historical data frames the current 34% crowd-implied probability for a top-three ranking as conservative; Berkeley Earth estimates a 51% chance 2026 lands fourth, with combined probabilities for first, second, or third place totalling 43% [2]. The past three years have already topped the leaderboard, establishing a baseline where 2026 is virtually certain to be a top-10 year, though the margin for a top-three finish depends on sustained anomalies [7].

Traders should monitor monthly Global Land-Ocean Temperature Index releases from NOAA, particularly the June and July reports which will cover the first half of the year and signal if the warming trend matches May’s second-highest monthly record [8]. The EU Climate Service’s ongoing monthly assessments, which recently ranked January 2026 as the fifth-warmest January globally, provide early indicators of whether the year will breach the 1.5°C threshold temporarily [3]. Settlement hinges on the final annual index data becoming available after 31 December 2026, with USDC settlement on-chain reflecting the definitive numerical rank regardless of later revisions [1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Where will 2026 rank among the hottest years on record? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

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.

FAQ

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.

Can I use Bitcoin directly?

No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.

How does UMA secure the resolution?

The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.

Are crypto prediction markets taxable in the US?

In the US, prediction market gains are typically treated as ordinary income or short-term capital gains depending on holding period. Consult a tax professional for your specific situation — we cannot provide tax advice.