{"station":{"icao":"KIAD","city":{"slug":"washington","name":"Washington D.C.","country":"United States"},"timezone":"America/New_York","lat":38.91,"lon":-77.04,"us":true,"html":"https://weathermarket.io/station/KIAD","json":"https://weathermarket.io/api/station/KIAD","nwsCli":{"html":"https://weathermarket.io/nws-cli/KIAD","json":"https://weathermarket.io/api/nws-cli/KIAD"}},"date":"2026-10-20","window":{"date":"2026-10-20","timezone":"America/New_York","dayStartUtc":"2026-10-20T04:00:00.000Z","dayEndUtc":"2026-10-21T04:00:00.000Z","utcOffsetStart":"-04:00","utcOffsetEnd":"-04:00","hours":24},"complete":true,"values":{"tmax":21.7,"tmaxAt":"2026-10-20T19:52:00.000Z","tmin":5.6,"tminAt":"2026-10-20T06:52:00.000Z","tavg":14,"humidityMean":52,"windMean":3.2,"windMax":6.2,"windMaxAt":"2026-10-20T14:52:00.000Z","precipObservedCount":0,"nObservations":24,"maxGapMinutes":60,"units":{"temperature":"°C","wind":"m/s","humidity":"%"},"source":"Extremes over the METAR observations listed in this record (hourly plus special reports) - the same record values.metarDerived carries in /api/station/{icao}/daily"},"extremes":{"tmax":{"obsTimeUtc":"2026-10-20T19:52:00.000Z","obsTimeLocal":"2026-10-20T15:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 201952Z 33010KT 10SM CLR 22/04 A3021 RMK AO2 SLP231 T02170044","temp":21.7,"dewpoint":4.4,"humidity":32,"wind":5.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},"tmin":{"obsTimeUtc":"2026-10-20T06:52:00.000Z","obsTimeLocal":"2026-10-20T02:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 200652Z 00000KT 10SM CLR 06/03 A3025 RMK AO2 SLP243 T00560033","temp":5.6,"dewpoint":3.3,"humidity":85,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},"windMax":{"obsTimeUtc":"2026-10-20T14:52:00.000Z","obsTimeLocal":"2026-10-20T10:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 201452Z 01012G17KT 10SM CLR 17/04 A3029 RMK AO2 SLP255 T01720039 50004","temp":17.2,"dewpoint":3.9,"humidity":41,"wind":6.2,"precipObserved":false,"correctedAt":null,"originalRaw":null}},"finality":{"status":"final","finalAt":"2026-10-21T07:00:00.000Z","settleable":true,"coverage":{"ok":true,"maxGapMinutes":60,"normalIntervalMin":60,"thresholdMinutes":90},"reasons":[],"holdHours":3},"revision":"78173b36d1afafad","lastChangedAt":"2026-10-21T03:55:38.855Z","corrections":[],"anchor":{"contract":"0x2B59812947B48B5988FaA805a9514a5162415091","chainId":14,"record":"https://weathermarket.io/api/station/KIAD/2026-10-20?format=record","status":"anchored","sha256":"7c0667e37cc402ddbe979b0edb96acaf8626c737aac9b95fd0e1a7093e08f06d","revision":"78173b36d1afafad","flareTxHash":"0xd1820a9490fa0f7d5a2f7c7036f9dd753ea96f4b0d435325aecd2195f0c7bc47","flareBlock":73860312,"anchoredAt":"2026-11-06T05:01:27.405Z","explorer":"https://flare-explorer.flare.network/tx/0xd1820a9490fa0f7d5a2f7c7036f9dd753ea96f4b0d435325aecd2195f0c7bc47","matchesCurrent":true,"note":"GET the record bytes, SHA-256 them, and call SnapshotAnchor.isAnchored(sha256) on Flare - the anchored record is the one to settle on"},"qc":{"summary":{"good":24,"suspect":0,"bad":0,"flagged":[]},"extremes":{"tmax":{"obsTimeUtc":"2026-10-20T19:52:00.000Z","flag":"good","reasons":[]},"tmin":{"obsTimeUtc":"2026-10-20T06:52:00.000Z","flag":"good","reasons":[]},"anyFlagged":false},"excludingBad":{"tmax":21.7,"tmin":5.6,"differsFromRecord":false},"note":"Flags are attached beside the anchored record and are not part of its bytes; the record's extremes are unchanged. A suspect extreme is usable but worth checking against the raw text (extremes.*.reasons); a bad report is physically impossible and excludingBad shows the extremes without it."},"official":{"status":"issued","tmax":21.67,"tmin":5.56,"precip":0,"corrected":false,"issuedAt":"2026-10-21T06:26:00.000Z","html":"https://weathermarket.io/nws-cli/KIAD/2026-10-20","json":"https://weathermarket.io/api/nws-cli/KIAD/2026-10-20"},"observations":[{"obsTimeUtc":"2026-10-20T04:52:00.000Z","obsTimeLocal":"2026-10-20T00:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 200452Z 00000KT 10SM CLR 07/03 A3026 RMK AO2 SLP245 T00720033 402000022","temp":7.2,"dewpoint":3.3,"humidity":76,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T05:52:00.000Z","obsTimeLocal":"2026-10-20T01:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 200552Z 31003KT 10SM CLR 07/03 A3025 RMK AO2 SLP243 T00720028 10144 20061 56004","temp":7.2,"dewpoint":2.8,"humidity":74,"wind":1.5,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T06:52:00.000Z","obsTimeLocal":"2026-10-20T02:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 200652Z 00000KT 10SM CLR 06/03 A3025 RMK AO2 SLP243 T00560033","temp":5.6,"dewpoint":3.3,"humidity":85,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T07:52:00.000Z","obsTimeLocal":"2026-10-20T03:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 200752Z 31003KT 10SM CLR 07/02 A3024 RMK AO2 SLP239 T00720022","temp":7.2,"dewpoint":2.2,"humidity":71,"wind":1.5,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T08:52:00.000Z","obsTimeLocal":"2026-10-20T04:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 200852Z 34006KT 10SM CLR 09/02 A3024 RMK AO2 SLP238 T00940017 56005","temp":9.4,"dewpoint":1.7,"humidity":59,"wind":3.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T09:52:00.000Z","obsTimeLocal":"2026-10-20T05:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 200952Z 33004KT 10SM CLR 10/01 A3025 RMK AO2 SLP243 T01000011","temp":10,"dewpoint":1.1,"humidity":54,"wind":2.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T10:52:00.000Z","obsTimeLocal":"2026-10-20T06:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 201052Z 34005KT 10SM CLR 09/01 A3026 RMK AO2 SLP247 T00940011","temp":9.4,"dewpoint":1.1,"humidity":56,"wind":2.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T11:52:00.000Z","obsTimeLocal":"2026-10-20T07:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 201152Z 33006KT 10SM FEW040 09/01 A3027 RMK AO2 SLP252 T00940011 10100 20056 51013","temp":9.4,"dewpoint":1.1,"humidity":56,"wind":3.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T12:52:00.000Z","obsTimeLocal":"2026-10-20T08:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 201252Z 33007KT 10SM FEW040 11/02 A3029 RMK AO2 SLP256 T01110022","temp":11.1,"dewpoint":2.2,"humidity":54,"wind":3.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T13:52:00.000Z","obsTimeLocal":"2026-10-20T09:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 201352Z 34008KT 10SM CLR 15/03 A3030 RMK AO2 SLP259 T01500033","temp":15,"dewpoint":3.3,"humidity":45,"wind":4.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T14:52:00.000Z","obsTimeLocal":"2026-10-20T10:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 201452Z 01012G17KT 10SM CLR 17/04 A3029 RMK AO2 SLP255 T01720039 50004","temp":17.2,"dewpoint":3.9,"humidity":41,"wind":6.2,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T15:52:00.000Z","obsTimeLocal":"2026-10-20T11:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 201552Z 36010G18KT 10SM CLR 18/04 A3028 RMK AO2 SLP253 T01830044","temp":18.3,"dewpoint":4.4,"humidity":40,"wind":5.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T16:52:00.000Z","obsTimeLocal":"2026-10-20T12:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 201652Z 34007G16KT 10SM CLR 19/05 A3026 RMK AO2 SLP247 T01940050","temp":19.4,"dewpoint":5,"humidity":39,"wind":3.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T17:52:00.000Z","obsTimeLocal":"2026-10-20T13:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 201752Z 34011KT 8SM CLR 21/04 A3024 RMK AO2 SLP240 T02060044 10206 20094 58014","temp":20.6,"dewpoint":4.4,"humidity":35,"wind":5.7,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T18:52:00.000Z","obsTimeLocal":"2026-10-20T14:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 201852Z 35010KT 10SM CLR 21/04 A3022 RMK AO2 SLP233 T02110039","temp":21.1,"dewpoint":3.9,"humidity":32,"wind":5.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T19:52:00.000Z","obsTimeLocal":"2026-10-20T15:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 201952Z 33010KT 10SM CLR 22/04 A3021 RMK AO2 SLP231 T02170044","temp":21.7,"dewpoint":4.4,"humidity":32,"wind":5.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T20:52:00.000Z","obsTimeLocal":"2026-10-20T16:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 202052Z 01012G19KT 10SM CLR 21/05 A3021 RMK AO2 SLP229 T02110050 56011","temp":21.1,"dewpoint":5,"humidity":35,"wind":6.2,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T21:52:00.000Z","obsTimeLocal":"2026-10-20T17:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 202152Z 01009KT 10SM CLR 20/04 A3022 RMK AO2 SLP232 T02000044","temp":20,"dewpoint":4.4,"humidity":36,"wind":4.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T22:52:00.000Z","obsTimeLocal":"2026-10-20T18:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 202252Z 02008KT 10SM CLR 18/05 A3023 RMK AO2 SLP237 T01830050","temp":18.3,"dewpoint":5,"humidity":42,"wind":4.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-20T23:52:00.000Z","obsTimeLocal":"2026-10-20T19:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 202352Z 02008KT 10SM CLR 18/04 A3024 RMK AO2 SLP238 T01780044 10217 20172 51009","temp":17.8,"dewpoint":4.4,"humidity":41,"wind":4.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-21T00:52:00.000Z","obsTimeLocal":"2026-10-20T20:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 210052Z 01004KT 10SM CLR 16/04 A3024 RMK AO2 SLP239 T01610044","temp":16.1,"dewpoint":4.4,"humidity":46,"wind":2.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-21T01:52:00.000Z","obsTimeLocal":"2026-10-20T21:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 210152Z 32003KT 10SM CLR 14/05 A3024 RMK AO2 SLP239 T01390050","temp":13.9,"dewpoint":5,"humidity":55,"wind":1.5,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-21T02:52:00.000Z","obsTimeLocal":"2026-10-20T22:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 210252Z 00000KT 10SM CLR 09/06 A3024 RMK AO2 SLP241 T00890056 53002","temp":8.9,"dewpoint":5.6,"humidity":80,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-21T03:52:00.000Z","obsTimeLocal":"2026-10-20T23:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 210352Z 33004KT 10SM CLR 11/04 A3024 RMK AO2 SLP239 T01110044 $","temp":11.1,"dewpoint":4.4,"humidity":63,"wind":2.1,"precipObserved":false,"correctedAt":null,"originalRaw":null}],"about":{"record":"Station-day record: the daily extremes over every METAR observation (hourly plus special reports) received for the station's local calendar day - local midnight to local midnight, daylight saving applied. Temperatures are whole degrees Celsius as reported in METAR; a short-lived peak between reports can be missed. This is not a model or an aggregate - every value points at the report that produced it, and every report in the day is listed verbatim.","settlementRule":"The settlement value is the daily maximum (or minimum) of this record once it is final: the local day has ended and the 3-hour correction hold has passed. A day whose longest gap between reports exceeds the station's normal interval plus 30 minutes is final but flagged not settleable - a market should treat it as a review case. Once final, the canonical record bytes are hashed (SHA-256) and the hash is written to the SnapshotAnchor contract on Flare; the anchored record is the settlement record even if reports change afterwards (matchesCurrent then reads false). US markets usually settle on the official NWS CLI value instead - see the NWS CLI archive for this station; both values are shown side by side.","verify":["Every METAR in the day is listed with its raw text; compare it with the independent archives linked under links.external (IEM ASOS archive, Ogimet).","GET links.record for the canonical record bytes, SHA-256 them and compare with anchor.sha256; call SnapshotAnchor.isAnchored(sha256) on Flare (anchor.contract, anchor.chainId) to confirm the hash is on-chain. anchor.explorer opens the anchoring transaction.","Permalink pattern for market rules: https://weathermarket.io/station/KIAD/YYYY-MM-DD (HTML) and https://weathermarket.io/api/station/KIAD/YYYY-MM-DD (JSON)."],"citation":"Settlement source: the METAR-derived station-day record for KIAD for the contract date (station-local calendar day), as published at https://weathermarket.io/station/KIAD/YYYY-MM-DD with every observation used, the finality status and the Flare anchor of the record. The daily value is the extreme over the hourly and special METAR reports in that day; a short-lived peak between reports may be missed. If the record is not final and settleable by the resolution deadline, the market is flagged for review."},"links":{"html":"https://weathermarket.io/station/KIAD/2026-10-20","json":"https://weathermarket.io/api/station/KIAD/2026-10-20","record":"https://weathermarket.io/api/station/KIAD/2026-10-20?format=record","prev":"https://weathermarket.io/station/KIAD/2026-10-19","next":"https://weathermarket.io/station/KIAD/2026-10-21","station":"https://weathermarket.io/station/KIAD","external":{"iem":"https://mesonet.agron.iastate.edu/cgi-bin/request/asos.py?station=IAD&data=metar&year1=2026&month1=10&day1=20&year2=2026&month2=10&day2=22&tz=Etc%2FUTC&format=onlycomma&latlon=no&elev=no&missing=M&trace=T&direct=no&report_type=3&report_type=4","ogimet":"https://www.ogimet.com/display_metars2.php?lang=en&lugar=KIAD&tipo=SA&ord=REV&nil=SI&fmt=html&ano=2026&mes=10&day=20&hora=4&anof=2026&mesf=10&dayf=21&horaf=3&minf=59&send=send","awcLive":"https://aviationweather.gov/data/metar/?ids=KIAD"}}}