Trade: Lowest temperature in Tokyo on May 17?

Market context

On 17 May 2026, Tokyo's lowest temperature will be recorded at Haneda Airport Station and resolved against predefined Celsius ranges. The current order book on Polymarket implies a 2% probability that the day's minimum will fall into the coldest bracket, suggesting traders assess a very low likelihood of exceptionally cold conditions during mid-May in Tokyo.

Tokyo's May temperatures historically cluster around 15–25°C for daily lows, with readings below 10°C occurring rarely in the month. Data from the past two decades shows May minimums typically remain above 12°C, with sub-10°C readings appearing roughly once every five to ten years during this period. The 2% implied probability reflects this seasonal pattern—late spring in Tokyo ordinarily brings mild overnight temperatures as the region transitions toward summer conditions. Traders pricing the coldest outcome are essentially betting against the statistical norm for this calendar date.

The relevant catalysts centre on large-scale weather systems that could push cold air southward into the Tokyo region. Monitoring Japan Meteorological Agency forecasts from early May will be critical, particularly any advisories regarding unusual pressure patterns or cold fronts tracking toward the Kanto region. Additionally, the El Niño or La Niña status heading into May could influence broader atmospheric circulation patterns affecting Japan's spring weather. Traders should track seasonal climate outlooks released in April to assess whether conditions are tracking toward anomalous cold or typical mild May weather.

Resolution source

This market settles from the official outcome published at https://www.wunderground.com/history/daily/jp/tokyo/RJTT. A proposer submits the final result to the UMA optimistic oracle on Polygon; the two-hour dispute window closes and payouts clear in USDC.

How to trade this market step by step

The mechanics for trading "Lowest temperature in Tokyo on May 17?" are the same as any other PolyGram event contract. Each YES share resolves to $1 if the event happens, or $0 if it doesn't. The current price between 0¢ and 100¢ is the market's probability estimate, set live by the order book.

1. Sign in on polygram.ink with your email — no full KYC under $1,500 lifetime trading volume.
2. Deposit USDC on Polygon (lowest fees, ~$0.01 per transaction) or Ethereum. Funds credit after 12 confirmations.
3. Pick a side. Buy YES if you believe the event will happen; buy NO if you think it won't. The current YES price reflects the market's collective probability.
4. Size your position. If you stake 100 USDC at 50% YES, you'll receive shares that pay $200 if YES resolves true — a 100% gross return. If NO resolves, your shares are worth $0.
5. Set risk controls (optional). Stop-loss, take-profit, and limit-order types all supported. Use the trade ticket's slippage box to cap your maximum entry price.
6. Wait for resolution. When the event resolves on-chain via the UMA optimistic oracle, the winning side settles to 100¢ automatically and USDC hits your balance within seconds. Withdrawable to any wallet you control.

How active is this market?

$208 in lifetime turnover and $7K of resting liquidity puts this market in the below the median by volume for weather contracts on PolyGram. Order-book depth is thin — large orders may need to be split across the book or executed as limit orders.

Last 24 hours alone saw $208 in turnover, well above the lifetime daily-average for this market — a clear sign of news catalysing trader activity right now.

The market has been open for under a month — fresh enough that information asymmetry remains a real factor.

Higher-volume markets tend to have tighter spreads and faster price discovery — meaning the displayed YES/NO percentages are more likely to reflect the true crowd-implied probability rather than a single trader's directional view.

Key terms

YES / NO share

A binary outcome token that pays $1.00 if the underlying claim resolves true (YES) or false (NO), and $0 otherwise. The market price between 0¢ and 100¢ is the implied probability.

CLOB

Central limit order book. The matching engine that pairs YES buyers with NO buyers (effectively the same trade). Polymarket's CLOB on Polygon executes trades on-chain via the conditional-tokens framework.

Liquidity

USDC capital sitting in resting limit orders inside the order book. Deeper liquidity means smaller slippage on large trades and a tighter bid-ask spread.

UMA optimistic oracle

The on-chain dispute system that settles each Polymarket market. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution.

Slippage

The difference between the displayed mid-price and your fill price. Affects market orders most; limit orders avoid slippage but may take time to fill.

Conditional token

ERC-1155 outcome share issued by Gnosis Conditional Tokens on Polygon. The token type that resolves to $1.00 or $0.00 at settlement.

See the full prediction-market glossary →

Frequently asked questions

Risk and regulatory note

Prediction-market positions can lose 100% of staked capital. Outcomes are uncertain by definition — historical accuracy of crowd-implied probabilities is high in aggregate but not for any single market. PolyGram does not provide investment advice. Trade only with capital you can afford to lose.

Regulatory status varies by jurisdiction. Germany, the United States, and most EU countries treat Polymarket-style event contracts under one of three frameworks: financial derivative, gambling product, or unregulated novel asset. Consult local counsel before trading.

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