{"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":"2026-10-18","window":{"date":"2026-10-18","timezone":"America/New_York","dayStartUtc":"2026-10-18T04:00:00.000Z","dayEndUtc":"2026-10-19T04:00:00.000Z","utcOffsetStart":"-04:00","utcOffsetEnd":"-04:00","hours":24},"complete":true,"values":{"tmax":16.7,"tmaxAt":"2026-10-18T20:52:00.000Z","tmin":2.8,"tminAt":"2026-10-18T10:52:00.000Z","tavg":9.3,"humidityMean":53.5,"windMean":2.2,"windMax":4.6,"windMaxAt":"2026-10-18T13:52:00.000Z","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":"2026-10-18T20:52:00.000Z","obsTimeLocal":"2026-10-18T16:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 182052Z 36006KT 10SM CLR 17/M04 A3054 RMK AO2 SLP343 T01671039 56014 $","temp":16.7,"dewpoint":-3.9,"humidity":24,"wind":3.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},"tmin":{"obsTimeUtc":"2026-10-18T10:52:00.000Z","obsTimeLocal":"2026-10-18T06:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 181052Z 00000KT 10SM CLR 03/M01 A3054 RMK AO2 SLP344 T00281006 $","temp":2.8,"dewpoint":-0.6,"humidity":78,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},"windMax":{"obsTimeUtc":"2026-10-18T13:52:00.000Z","obsTimeLocal":"2026-10-18T09:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 181352Z 02009KT 10SM CLR 09/M02 A3061 RMK AO2 SLP367 T00941022 $","temp":9.4,"dewpoint":-2.2,"humidity":44,"wind":4.6,"precipObserved":false,"correctedAt":null,"originalRaw":null}},"finality":{"status":"final","finalAt":"2026-10-19T07:00:00.000Z","settleable":true,"coverage":{"ok":true,"maxGapMinutes":60,"normalIntervalMin":60,"thresholdMinutes":90},"reasons":[],"holdHours":3},"revision":"6dfc659a6167e103","lastChangedAt":"2026-10-19T03:56:39.076Z","corrections":[],"anchor":{"contract":"0x2B59812947B48B5988FaA805a9514a5162415091","chainId":14,"record":"https://weathermarket.io/api/station/KIAD/2026-10-18?format=record","status":"anchored","sha256":"de481f592b97b8ab7e14b7ccd4009f7e08d8f9304cff604d163afa9eadec9880","revision":"6dfc659a6167e103","flareTxHash":"0x0979db42477d6b5889c9056db8604e20986724061f63977cbf2f27725122e23c","flareBlock":72462385,"anchoredAt":"2026-10-19T07:01:49.841Z","explorer":"https://flare-explorer.flare.network/tx/0x0979db42477d6b5889c9056db8604e20986724061f63977cbf2f27725122e23c","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":"2026-10-18T20:52:00.000Z","flag":"good","reasons":[]},"tmin":{"obsTimeUtc":"2026-10-18T10:52:00.000Z","flag":"good","reasons":[]},"anyFlagged":false},"excludingBad":{"tmax":16.7,"tmin":2.8,"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":16.67,"tmin":2.78,"precip":0,"corrected":false,"issuedAt":"2026-10-19T06:22:00.000Z","html":"https://weathermarket.io/nws-cli/KIAD/2026-10-18","json":"https://weathermarket.io/api/nws-cli/KIAD/2026-10-18"},"observations":[{"obsTimeUtc":"2026-10-18T04:52:00.000Z","obsTimeLocal":"2026-10-18T00:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 180452Z 34004KT 10SM CLR 07/00 A3046 RMK AO2 SLP315 T00670000 401610067 $","temp":6.7,"dewpoint":0,"humidity":62,"wind":2.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T05:52:00.000Z","obsTimeLocal":"2026-10-18T01:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 180552Z 32003KT 10SM CLR 06/01 A3047 RMK AO2 SLP319 T00560006 10111 20050 53009 $","temp":5.6,"dewpoint":0.6,"humidity":70,"wind":1.5,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T06:52:00.000Z","obsTimeLocal":"2026-10-18T02:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 180652Z 02004KT 10SM CLR 05/01 A3049 RMK AO2 SLP324 T00500011 $","temp":5,"dewpoint":1.1,"humidity":76,"wind":2.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T07:52:00.000Z","obsTimeLocal":"2026-10-18T03:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 180752Z 35008KT 10SM CLR 07/M01 A3049 RMK AO2 SLP326 T00671006 $","temp":6.7,"dewpoint":-0.6,"humidity":60,"wind":4.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T08:52:00.000Z","obsTimeLocal":"2026-10-18T04:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 180852Z 34008KT 10SM CLR 07/M01 A3050 RMK AO2 SLP328 T00671011 51009 $","temp":6.7,"dewpoint":-1.1,"humidity":58,"wind":4.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T09:52:00.000Z","obsTimeLocal":"2026-10-18T05:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 180952Z 33004KT 10SM CLR 05/M01 A3052 RMK AO2 SLP335 T00501006 $","temp":5,"dewpoint":-0.6,"humidity":67,"wind":2.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T10:52:00.000Z","obsTimeLocal":"2026-10-18T06:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 181052Z 00000KT 10SM CLR 03/M01 A3054 RMK AO2 SLP344 T00281006 $","temp":2.8,"dewpoint":-0.6,"humidity":78,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T11:52:00.000Z","obsTimeLocal":"2026-10-18T07:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 181152Z 03005KT 10SM CLR 06/M01 A3057 RMK AO2 SLP352 T00561011 10067 20028 53022 $","temp":5.6,"dewpoint":-1.1,"humidity":62,"wind":2.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T12:52:00.000Z","obsTimeLocal":"2026-10-18T08:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 181252Z 03006KT 10SM CLR 08/M02 A3060 RMK AO2 SLP362 T00831022 $","temp":8.3,"dewpoint":-2.2,"humidity":48,"wind":3.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T13:52:00.000Z","obsTimeLocal":"2026-10-18T09:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 181352Z 02009KT 10SM CLR 09/M02 A3061 RMK AO2 SLP367 T00941022 $","temp":9.4,"dewpoint":-2.2,"humidity":44,"wind":4.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T14:52:00.000Z","obsTimeLocal":"2026-10-18T10:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 181452Z 05007KT 10SM CLR 11/M02 A3062 RMK AO2 SLP369 T01111017 51018 $","temp":11.1,"dewpoint":-1.7,"humidity":41,"wind":3.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T15:52:00.000Z","obsTimeLocal":"2026-10-18T11:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 181552Z 05005KT 10SM CLR 13/M02 A3063 RMK AO2 SLP371 T01281017 $","temp":12.8,"dewpoint":-1.7,"humidity":37,"wind":2.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T16:52:00.000Z","obsTimeLocal":"2026-10-18T12:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 181652Z VRB05KT 10SM CLR 14/M04 A3061 RMK AO2 SLP364 T01441044 $","temp":14.4,"dewpoint":-4.4,"humidity":27,"wind":2.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T17:52:00.000Z","obsTimeLocal":"2026-10-18T13:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 181752Z VRB05KT 10SM CLR 15/M04 A3058 RMK AO2 SLP357 T01501044 10156 20056 58012 $","temp":15,"dewpoint":-4.4,"humidity":26,"wind":2.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T18:52:00.000Z","obsTimeLocal":"2026-10-18T14:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 181852Z VRB05KT 10SM CLR 16/M04 A3056 RMK AO2 SLP350 T01561039 $","temp":15.6,"dewpoint":-3.9,"humidity":26,"wind":2.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T19:52:00.000Z","obsTimeLocal":"2026-10-18T15:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 181952Z VRB04KT 10SM CLR 16/M05 A3055 RMK AO2 SLP346 T01611050 $","temp":16.1,"dewpoint":-5,"humidity":23,"wind":2.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T20:52:00.000Z","obsTimeLocal":"2026-10-18T16:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 182052Z 36006KT 10SM CLR 17/M04 A3054 RMK AO2 SLP343 T01671039 56014 $","temp":16.7,"dewpoint":-3.9,"humidity":24,"wind":3.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T21:52:00.000Z","obsTimeLocal":"2026-10-18T17:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 182152Z 34004KT 10SM CLR 16/M03 A3053 RMK AO2 SLP340 T01561028 $","temp":15.6,"dewpoint":-2.8,"humidity":28,"wind":2.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T22:52:00.000Z","obsTimeLocal":"2026-10-18T18:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 182252Z 33005KT 10SM CLR 13/M01 A3053 RMK AO2 SLP340 T01331006 $","temp":13.3,"dewpoint":-0.6,"humidity":38,"wind":2.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-18T23:52:00.000Z","obsTimeLocal":"2026-10-18T19:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 182352Z 00000KT 10SM CLR 09/02 A3053 RMK AO2 SLP341 T00890022 10167 20089 55003 $","temp":8.9,"dewpoint":2.2,"humidity":63,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-19T00:52:00.000Z","obsTimeLocal":"2026-10-18T20:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 190052Z 00000KT 10SM CLR 07/03 A3053 RMK AO2 SLP340 T00670033 $","temp":6.7,"dewpoint":3.3,"humidity":79,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-19T01:52:00.000Z","obsTimeLocal":"2026-10-18T21:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 190152Z 00000KT 10SM CLR 06/03 A3052 RMK AO2 SLP338 T00560028 $","temp":5.6,"dewpoint":2.8,"humidity":82,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-19T02:52:00.000Z","obsTimeLocal":"2026-10-18T22:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 190252Z 00000KT 10SM CLR 06/03 A3053 RMK AO2 SLP338 T00560028 55003 $","temp":5.6,"dewpoint":2.8,"humidity":82,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-19T03:52:00.000Z","obsTimeLocal":"2026-10-18T23:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 190352Z 29003KT 10SM CLR 05/02 A3053 RMK AO2 SLP338 T00500022 $","temp":5,"dewpoint":2.2,"humidity":82,"wind":1.5,"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/2026-10-18","json":"https://weathermarket.io/api/station/KIAD/2026-10-18","record":"https://weathermarket.io/api/station/KIAD/2026-10-18?format=record","prev":"https://weathermarket.io/station/KIAD/2026-10-17","next":"https://weathermarket.io/station/KIAD/2026-10-19","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=18&year2=2026&month2=10&day2=20&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=18&hora=4&anof=2026&mesf=10&dayf=19&horaf=3&minf=59&send=send","awcLive":"https://aviationweather.gov/data/metar/?ids=KIAD"}}}