Polymarket Weather

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Polymarket Weather

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# Polymarket Weather Lag Signal — Profit Recipe **Category:** Prediction Markets / Signal Trading **Capital:** $50–$500 USD **Expected margin:** 8–25% in 24–48h, 15–40% monthly realistic **Difficulty:** Medium **Execution time:** 15 min/day --- ## 1. The market **Daily temperature markets on Polymarket** — specifically the *high temperature in NYC tomorrow* market (and its rotating analogs: Chicago, LA, Hong Kong, London). URL pattern: \`https://polymarket.com/event/highest-temperature-in-nyc-on-{date}\` Each market typically has $100k–$200k USD of verifiable volume. It opens ~48h before the date in question and resolves within 24h after — full cycle in 2 days. Resolution source: Wunderground KLGA (NYC) or NWS KNYC. Public, undisputed. ## 2. Where to buy and where to sell **Same platform, different time.** Polymarket's CLOB allows early exit: you buy YES on a temperature bucket at $0.28, and you sell that same share at $0.45 to another trader hours later — before resolution. Buy-and-resell, cross-time, on a single venue. That is the operation. Account requirements: - Polymarket account (wallet-based, no KYC for most amounts) - USDC.e on Polygon for funding - Not geo-blocked the way US election markets are ## 3. Why the opportunity exists Two public, free numerical weather models drive almost all of the price action: - **GFS** (Global Forecast System, NOAA) — runs at 00z, 06z, 12z, 18z UTC. Updated every 6h. - **ECMWF** (European Centre, "the European") — runs at 00z and 12z UTC. Updated every 12h. Plus two short-range models for the final 24h: - **HRRR** (hourly, NOAA) — fine-grained for the day-of - **NAM** (3-hourly, NOAA) **The edge:** there is a consistent **2–6 hour lag** between when a model run goes public and when the Polymarket orderbook absorbs the new forecast. Most Polymarket traders are gamblers, not meteorologists. They are not refreshing tropicaltidbits.com at 00:30 UTC. You are. ### Verifiable proof Wallet \`0x[redacted-top-10-all-time]\` converted ~$1,000 into ~$79,000 trading exactly these markets over Jan–Nov 2025. Background: ex-NOAA modeling team. Documented in MEXC News Nov 2025 coverage of top Polymarket P&Ls. The strategy is not secret — the discipline is. ## 4. The four free data sources | Source | URL | What for | |---|---|---| | GFS forecast | https://www.tropicaltidbits.com/analysis/models/?model=gfs&region=us&pkg=T2m_f&runtime=latest | 2m temperature forecast, freshest GFS run | | ECMWF forecast | https://www.tropicaltidbits.com/analysis/models/?model=ecmwf&region=us&pkg=T2m_f&runtime=latest | The European, 12h cadence | | HRRR (short-range) | https://rapidrefresh.noaa.gov/hrrr/HRRR/ | Final 24h, hourly | | Wunderground KLGA | https://www.wunderground.com/history/daily/us/ny/new-york-city/KLGA | Resolution source — verify after the fact | NWS official: https://forecast.weather.gov/MapClick.php?lat=40.7794&lon=-73.8803 ## 5. Model run calendar (UTC) | Model | Run times (UTC) | Data available | |---|---|---| | GFS | 00z, 06z, 12z, 18z | ~3.5h after run start | | ECMWF | 00z, 12z | ~6h after run start | | HRRR | every hour | ~1.5h after run start | | NAM | 00z, 06z, 12z, 18z | ~2.5h after run start | **Your daily window:** check at 04:00 UTC (00z GFS is in) and again at 16:00 UTC (12z ECMWF is in). Two 15-minute sessions. ## 6. The three repeating patterns ### Pattern A — Model run lag **Setup:** A fresh GFS or ECMWF run shifts the forecast by ≥1°F in either direction for the target day. **What happens:** The orderbook takes 2–6h to reprice. Bid/ask sit on the old forecast. **Trade:** Take the side the new model points to. Exit when the spread closes (usually next run, or when a known weather Twitter account posts). ### Pattern B — Tail mispricing **Setup:** Market offers a low-probability bucket (e.g. ">90°F" or "<32°F") at $0.04–$0.08 when the model envelope shows a real 10–15% chance. **What happens:** Crowd anchors on the median forecast and underweights the tails. **Trade:** Buy the tail bucket. Risk-defined: you risk $0.05 to make $0.95. ### Pattern C — Front timing **Setup:** A cold or warm front is forecast to arrive near midnight local time. Whether the front lands at 11pm or 1am determines the bucket. **What happens:** Orderbook is binary — fully priced on one side or the other. Front timing uncertainty creates 20–40% mispricing for ~12h. **Trade:** Take the contrarian side when the timing uncertainty (consult HRRR's hour-by-hour) is high. ## 7. Step-by-step playbook ### One-time setup (30 min) 1. Create Polymarket account — wallet-based, sign in with Magic or wallet of choice 2. Fund with $50–$500 in USDC.e on Polygon (cheapest bridge: Polymarket's own onramp or LI.FI) 3. Bookmark the 4 sources above 4. Subscribe to @SimonLeeWX, @nyctweather, @AlanReppert on X (the meteorologists most cited in market threads) ### Daily loop (15 min, twice a day) **Morning (04:00 UTC / 11pm EST):** 1. Open the NYC market for *tomorrow*. Note current bucket prices. 2. Pull the latest GFS 00z run from tropicaltidbits — look at the 2m temperature panel for the target day at peak heating hour (usually 18Z / 2pm EST for NYC summer). 3. Compare GFS to the consensus reflected in market prices. Does the model show 86°F when the 85–90 bucket is at $0.55? You're aligned — pass. 4. **If GFS shifts ≥1°F vs prior run AND market hasn't moved yet** → enter on that side, size 5–10% of bankroll. **Afternoon (16:00 UTC / 11am EST):** 1. Repeat with the 12z ECMWF run. 2. If you have an open position from morning: check whether the new run still supports your thesis. Hold if yes, exit if it shifted away. ### Exits - **Take profit:** when spread closes ≥70% of the way to your fair value. Don't be greedy for the last few cents. - **Stop loss:** if the next model run goes against you AND price has moved ≥$0.05 against your entry — exit. - **Resolution:** never hold to resolution unless you're 90%+ confident. Liquidity dries up the last 2h. ## 8. Example with real numbers (May 12, 2026) NYC daily high market for May 13. Bucket: **70–75°F** - 08:00 UTC: market price $0.31 (after 00z GFS showed 72°F) - 12z ECMWF run (released 18:00 UTC): shows 74°F. GFS 12z run agrees. - Orderbook still at $0.31 at 18:30 UTC. - Entry: bought 200 shares at $0.31 = $62 cost. - 23:00 UTC: market reprices to $0.48 after Eric Webb (@CapeWeather) tweets the new model agreement. - Exit: sold 200 shares at $0.45 = $90 received. - **Net: +$28 in ~5 hours, ~45% on capital deployed.** (Replace the date with whatever live market exists when you read this. The pattern is the same.) ## 9. Risk management - **Never size a single position above 15% of bankroll.** Weather models can be wrong. - **Diversify across 2–3 city markets** when available — NYC, Chicago, LA. Don't get correlated to one synoptic system. - **Avoid the last 6h before resolution** — liquidity vanishes, spreads widen, you become the exit liquidity. - **Track results in a spreadsheet** — entry, exit, model snapshot, P&L. You will find your own edges in months 2–3. - **Tax:** Polymarket profits are taxable. Keep records. ## 10. Analog markets where this applies When the NYC market is between cycles or you want diversification: - **Chicago daily high** — KORD, same playbook - **London daily high** — uses ECMWF more heavily (it's the European model), edge is wider - **Hong Kong daily high** — HKO is the resolution source, low Polymarket attention = larger lag - **Will it rain in [city] today** — same models, binary outcome - **Hurricane track / category markets** in season (Jun–Nov) — same lag dynamic with NHC advisories ## 11. Why this is replicable and defensible - Models are **public and free** — no edge erosion from paywalls - The bottleneck is **discipline and timezone**, not capital or access - Top wallets prove the alpha persists across seasons - Daily reset means you don't get squeezed out by one bad day - Sub-$100 entry, scales to $5k+ once you trust your read --- *This recipe is informational. Trading prediction markets carries risk of total loss of capital. Do your own research. Markets and links current as of May 2026.*

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