{"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":"2026-10-31","window":{"date":"2026-10-31","timezone":"America/New_York","dayStartUtc":"2026-10-31T04:00:00.000Z","dayEndUtc":"2026-11-01T04:00:00.000Z","utcOffsetStart":"-04:00","utcOffsetEnd":"-04:00","hours":24},"complete":true,"values":{"tmax":16.1,"tmaxAt":"2026-10-31T19:52:00.000Z","tmin":4.4,"tminAt":"2026-10-31T10:52:00.000Z","tavg":10.9,"humidityMean":65.9,"windMean":1.1,"windMax":3.6,"windMaxAt":"2026-10-31T14:52:00.000Z","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":"2026-10-31T19:52:00.000Z","obsTimeLocal":"2026-10-31T15:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 311952Z 34006KT 10SM FEW120 BKN210 BKN250 16/03 A3045 RMK AO2 SLP311 T01610028 $","temp":16.1,"dewpoint":2.8,"humidity":41,"wind":3.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},"tmin":{"obsTimeUtc":"2026-10-31T10:52:00.000Z","obsTimeLocal":"2026-10-31T06:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 311052Z 00000KT 10SM FEW250 04/03 A3044 RMK AO2 SLP307 T00440028 $","temp":4.4,"dewpoint":2.8,"humidity":89,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},"windMax":{"obsTimeUtc":"2026-10-31T14:52:00.000Z","obsTimeLocal":"2026-10-31T10:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 311452Z 01007KT 10SM BKN250 14/04 A3049 RMK AO2 SLP325 T01390039 50012 $","temp":13.9,"dewpoint":3.9,"humidity":51,"wind":3.6,"precipObserved":false,"correctedAt":null,"originalRaw":null}},"finality":{"status":"final","finalAt":"2026-11-01T07:00:00.000Z","settleable":true,"coverage":{"ok":true,"maxGapMinutes":60,"normalIntervalMin":60,"thresholdMinutes":90},"reasons":[],"holdHours":3},"revision":"ff9f00b8f2223fe7","lastChangedAt":"2026-11-01T03:54:49.866Z","corrections":[],"anchor":{"contract":"0x2B59812947B48B5988FaA805a9514a5162415091","chainId":14,"record":"https://weathermarket.io/api/station/KIAD/2026-10-31?format=record","status":"anchored","sha256":"4f0c50c725bf9cb294c49b500df5358d4a1d710c6a32b93e212524a114ce8607","revision":"ff9f00b8f2223fe7","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":"2026-10-31T19:52:00.000Z","flag":"good","reasons":[]},"tmin":{"obsTimeUtc":"2026-10-31T10:52:00.000Z","flag":"good","reasons":[]},"anyFlagged":false},"excludingBad":{"tmax":16.1,"tmin":4.4,"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":3.89,"precip":0,"corrected":false,"issuedAt":"2026-11-01T07:22:00.000Z","html":"https://weathermarket.io/nws-cli/KIAD/2026-10-31","json":"https://weathermarket.io/api/nws-cli/KIAD/2026-10-31"},"observations":[{"obsTimeUtc":"2026-10-31T04:52:00.000Z","obsTimeLocal":"2026-10-31T00:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 310452Z 33005KT 10SM FEW250 12/03 A3034 RMK AO2 SLP273 T01220033 402440100","temp":12.2,"dewpoint":3.3,"humidity":55,"wind":2.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T05:52:00.000Z","obsTimeLocal":"2026-10-31T01:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 310552Z 34005KT 10SM FEW250 12/04 A3036 RMK AO2 SLP278 T01220039 10178 20122 51012","temp":12.2,"dewpoint":3.9,"humidity":57,"wind":2.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T06:52:00.000Z","obsTimeLocal":"2026-10-31T02:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 310652Z 00000KT 10SM CLR 08/04 A3038 RMK AO2 SLP288 T00780039","temp":7.8,"dewpoint":3.9,"humidity":76,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T07:52:00.000Z","obsTimeLocal":"2026-10-31T03:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 310752Z 00000KT 10SM CLR 07/04 A3039 RMK AO2 SLP292 T00670039 $","temp":6.7,"dewpoint":3.9,"humidity":82,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T08:52:00.000Z","obsTimeLocal":"2026-10-31T04:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 310852Z 00000KT 10SM CLR 06/03 A3041 RMK AO2 SLP296 T00610033 51017 $","temp":6.1,"dewpoint":3.3,"humidity":82,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T09:52:00.000Z","obsTimeLocal":"2026-10-31T05:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 310952Z 00000KT 10SM FEW250 05/03 A3042 RMK AO2 SLP300 T00500033 $","temp":5,"dewpoint":3.3,"humidity":89,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T10:52:00.000Z","obsTimeLocal":"2026-10-31T06:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 311052Z 00000KT 10SM FEW250 04/03 A3044 RMK AO2 SLP307 T00440028 $","temp":4.4,"dewpoint":2.8,"humidity":89,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T11:52:00.000Z","obsTimeLocal":"2026-10-31T07:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 311152Z 00000KT 10SM FEW050 FEW250 04/03 A3046 RMK AO2 SLP314 T00440028 10117 20039 53017 $","temp":4.4,"dewpoint":2.8,"humidity":89,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T12:52:00.000Z","obsTimeLocal":"2026-10-31T08:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 311252Z 00000KT 10SM FEW050 SCT250 08/06 A3048 RMK AO2 SLP322 T00830056 $","temp":8.3,"dewpoint":5.6,"humidity":83,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T13:52:00.000Z","obsTimeLocal":"2026-10-31T09:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 311352Z 33005KT 10SM SCT250 12/05 A3050 RMK AO2 SLP327 T01170050 $","temp":11.7,"dewpoint":5,"humidity":63,"wind":2.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T14:52:00.000Z","obsTimeLocal":"2026-10-31T10:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 311452Z 01007KT 10SM BKN250 14/04 A3049 RMK AO2 SLP325 T01390039 50012 $","temp":13.9,"dewpoint":3.9,"humidity":51,"wind":3.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T15:52:00.000Z","obsTimeLocal":"2026-10-31T11:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 311552Z 01004KT 10SM BKN250 14/04 A3050 RMK AO2 SLP327 T01390039 $","temp":13.9,"dewpoint":3.9,"humidity":51,"wind":2.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T16:52:00.000Z","obsTimeLocal":"2026-10-31T12:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 311652Z 04005KT 10SM BKN250 15/04 A3048 RMK AO2 SLP322 T01500044 $","temp":15,"dewpoint":4.4,"humidity":49,"wind":2.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T17:52:00.000Z","obsTimeLocal":"2026-10-31T13:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 311752Z VRB05KT 10SM SCT210 BKN250 16/04 A3046 RMK AO2 SLP315 T01560044 10156 20044 58010 $","temp":15.6,"dewpoint":4.4,"humidity":47,"wind":2.6,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T18:52:00.000Z","obsTimeLocal":"2026-10-31T14:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 311852Z 00000KT 10SM BKN250 16/03 A3045 RMK AO2 SLP311 T01560028 $","temp":15.6,"dewpoint":2.8,"humidity":42,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T19:52:00.000Z","obsTimeLocal":"2026-10-31T15:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 311952Z 34006KT 10SM FEW120 BKN210 BKN250 16/03 A3045 RMK AO2 SLP311 T01610028 $","temp":16.1,"dewpoint":2.8,"humidity":41,"wind":3.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T20:52:00.000Z","obsTimeLocal":"2026-10-31T16:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 312052Z 30006KT 10SM FEW120 BKN210 BKN250 16/03 A3045 RMK AO2 SLP313 T01610033 55003 $","temp":16.1,"dewpoint":3.3,"humidity":42,"wind":3.1,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T21:52:00.000Z","obsTimeLocal":"2026-10-31T17:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 312152Z 31003KT 10SM FEW120 BKN210 BKN250 15/03 A3046 RMK AO2 SLP314 T01500028 $","temp":15,"dewpoint":2.8,"humidity":44,"wind":1.5,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T22:52:00.000Z","obsTimeLocal":"2026-10-31T18:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 312252Z 00000KT 10SM BKN210 BKN250 11/05 A3047 RMK AO2 SLP321 T01060050 $","temp":10.6,"dewpoint":5,"humidity":68,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-10-31T23:52:00.000Z","obsTimeLocal":"2026-10-31T19:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 312352Z 00000KT 10SM BKN180 BKN250 10/06 A3048 RMK AO2 SLP323 T01000056 10167 20100 53009 $","temp":10,"dewpoint":5.6,"humidity":74,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-11-01T00:52:00.000Z","obsTimeLocal":"2026-10-31T20:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 010052Z 00000KT 10SM FEW100 BKN180 OVC250 10/06 A3049 RMK AO2 SLP324 T01000056 $","temp":10,"dewpoint":5.6,"humidity":74,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-11-01T01:52:00.000Z","obsTimeLocal":"2026-10-31T21:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 010152Z 00000KT 10SM FEW100 BKN180 OVC250 10/06 A3049 RMK AO2 SLP327 T01000061 $","temp":10,"dewpoint":6.1,"humidity":77,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-11-01T02:52:00.000Z","obsTimeLocal":"2026-10-31T22:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 010252Z 00000KT 10SM FEW100 BKN160 OVC250 10/07 A3050 RMK AO2 SLP329 T01000067 53007 $","temp":10,"dewpoint":6.7,"humidity":80,"wind":0,"precipObserved":false,"correctedAt":null,"originalRaw":null},{"obsTimeUtc":"2026-11-01T03:52:00.000Z","obsTimeLocal":"2026-10-31T23:52:00-04:00","metarType":"METAR","raw":"METAR KIAD 010352Z 00000KT 10SM BKN150 OVC250 10/06 A3050 RMK AO2 SLP327 T01000061 $","temp":10,"dewpoint":6.1,"humidity":77,"wind":0,"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/2026-10-31","json":"https://weathermarket.io/api/station/KIAD/2026-10-31","record":"https://weathermarket.io/api/station/KIAD/2026-10-31?format=record","prev":"https://weathermarket.io/station/KIAD/2026-10-30","next":"https://weathermarket.io/station/KIAD/2026-11-01","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=31&year2=2026&month2=11&day2=2&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=31&hora=4&anof=2026&mesf=11&dayf=1&horaf=3&minf=59&send=send","awcLive":"https://aviationweather.gov/data/metar/?ids=KIAD"}}}