{"station":{"icao":"KIAD","cliId":"IAD","pil":"CLIIAD","city":{"slug":"washington","name":"워싱턴 D.C.","country":"United States"},"timezone":"America/New_York","feed":"https://api.weather.gov/products/types/CLI/locations/IAD","html":"https://weathermarket.io/nws-cli/KIAD","json":"https://weathermarket.io/api/nws-cli/KIAD"},"stationToday":"2026-11-14","day":{"date":"2026-10-03","status":"issued","note":"Final CLI issued - values.nwsOfficial carries the official daily values (metric here; official.issued.asReported keeps the °F / inch / mph exactly as printed).","settlement":{"tmaxF":68,"tminF":57,"precipIn":0.09,"precipTrace":false,"tmax":20,"tmin":13.89,"precip":2.29,"issuedAt":"2026-10-04T06:32:00.000Z","productId":"iem:CDUS41-KLWX-040632:IAD:2026-10-03:final","corrected":false,"reissues":0,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLIIAD&e=202610040632"},"issues":[{"kind":"interim","asOfLocal":"0500 PM","issuedAt":"2026-10-03T21:31:00.000Z","issuedLocal":"531 PM EDT SAT OCT 03 2026","office":"KLWX","wmoHeader":"CDUS41 KLWX 032131","productId":"iem:CDUS41-KLWX-032131:IAD:2026-10-03:interim","source":"iem-afos","corrected":false,"tmaxF":68,"tmaxTimeLocal":"2:03 AM","tminF":57,"tminTimeLocal":"9:34 AM","precipIn":0.09,"precipTrace":false,"snowIn":0,"snowTrace":false,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLIIAD&e=202610032131","parseProblems":[],"rawTextSha256":"b596575c09d28999346656e925c3c31c4aa3fd4f817f8fe8305dcb227331de56","rawText":"CDUS41 KLWX 032131\nCLIIAD\n\nCLIMATE REPORT \nNATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC \n531 PM EDT SAT OCT 03 2026\n\n...................................\n\n...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 3 2026...\nVALID TODAY AS OF 0500 PM LOCAL TIME.\n\nCLIMATE NORMAL PERIOD: 1991 TO 2020\nCLIMATE RECORD PERIOD: 1960 TO 2026\n\n\nWEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST \n VALUE (LST) VALUE VALUE FROM YEAR \n NORMAL \n...................................................................\nTEMPERATURE (F) \n TODAY \n MAXIMUM 68 2:03 AM 86 2002 73 -5 74 \n 2007 \n 2018 \n MINIMUM 57 9:34 AM 30 1974 51 6 45 \n 2003 \n AVERAGE 63 62 1 60 \n\nPRECIPITATION (IN) \n TODAY 0.09 0.86 1987 0.12 -0.03 0.00 \n MONTH TO DATE 0.33 0.38 -0.05 0.00 \n SINCE SEP 1 4.13 4.32 -0.19 1.22 \n SINCE JAN 1 33.53 33.54 -0.01 25.86 \n\nSNOWFALL (IN) \n TODAY 0.0 MM MM 0.0 0.0 0.0 \n MONTH TO DATE 0.0 0.0 0.0 0.0 \n SINCE SEP 1 0.0 0.0 0.0 0.0 \n SINCE JUL 1 0.0 0.0 0.0 0.0 \n SNOW DEPTH 0 \n\nDEGREE DAYS \n HEATING \n TODAY 2 5 -3 5 \n MONTH TO DATE 2 14 -12 14 \n SINCE SEP 1 23 59 -36 21 \n SINCE JUL 1 23 60 -37 23 \n\n COOLING \n TODAY 0 2 -2 0 \n MONTH TO DATE 19 6 13 0 \n SINCE SEP 1 217 158 59 170 \n SINCE JAN 1 1497 1214 283 1318 \n...................................................................\n\n\nWIND (MPH) \n HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION N (20) \n HIGHEST GUST SPEED 28 HIGHEST GUST DIRECTION N (20) \n AVERAGE WIND SPEED 7.0 \n\n\nSKY COVER \n AVERAGE SKY COVER 0.9 \n\n\nWEATHER CONDITIONS \nTHE FOLLOWING WEATHER WAS RECORDED TODAY. \n LIGHT RAIN \n FOG \n\n\nRELATIVE HUMIDITY (PERCENT)\n HIGHEST 84 12:00 AM \n LOWEST 60 2:00 PM \n AVERAGE 72 \n\n..........................................................\n\n\nTHE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW\n NORMAL RECORD YEAR \n MAXIMUM TEMPERATURE (F) 72 90 2013 \n MINIMUM TEMPERATURE (F) 50 26 1974 \n\n\nSUNRISE AND SUNSET \nOCTOBER 3 2026.......SUNRISE 7:08 AM EDT SUNSET 6:49 PM EDT \nOCTOBER 4 2026.......SUNRISE 7:09 AM EDT SUNSET 6:48 PM EDT \n\n\n- INDICATES NEGATIVE NUMBERS.\nR INDICATES RECORD WAS SET OR TIED.\nMM INDICATES DATA IS MISSING.\nT INDICATES TRACE AMOUNT.\n\n\n\n\n$$"},{"kind":"final","asOfLocal":null,"issuedAt":"2026-10-04T06:32:00.000Z","issuedLocal":"232 AM EDT SUN OCT 04 2026","office":"KLWX","wmoHeader":"CDUS41 KLWX 040632","productId":"iem:CDUS41-KLWX-040632:IAD:2026-10-03:final","source":"iem-afos","corrected":false,"tmaxF":68,"tmaxTimeLocal":"2:03 AM","tminF":57,"tminTimeLocal":"9:34 AM","precipIn":0.09,"precipTrace":false,"snowIn":0,"snowTrace":false,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLIIAD&e=202610040632","parseProblems":[],"rawTextSha256":"14f36f698bb2c6be982a1018d48b712f2ca171a74ac93861a9700dc63cf205e4","rawText":"CDUS41 KLWX 040632\nCLIIAD\n\nCLIMATE REPORT \nNATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC \n232 AM EDT SUN OCT 04 2026\n\n...................................\n\n...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 3 2026...\n\nCLIMATE NORMAL PERIOD: 1991 TO 2020\nCLIMATE RECORD PERIOD: 1960 TO 2026\n\n\nWEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST \n VALUE (LST) VALUE VALUE FROM YEAR \n NORMAL \n...................................................................\nTEMPERATURE (F) \n YESTERDAY \n MAXIMUM 68 2:03 AM 86 2002 73 -5 74 \n 2007 \n 2018 \n MINIMUM 57 9:34 AM 30 1974 51 6 45 \n 2003 \n AVERAGE 63 62 1 60 \n\nPRECIPITATION (IN) \n YESTERDAY 0.09 0.86 1987 0.12 -0.03 0.00 \n MONTH TO DATE 0.33 0.38 -0.05 0.00 \n SINCE SEP 1 4.13 4.32 -0.19 1.22 \n SINCE JAN 1 33.53 33.54 -0.01 25.86 \n\nSNOWFALL (IN) \n YESTERDAY 0.0 MM MM 0.0 0.0 0.0 \n MONTH TO DATE 0.0 0.0 0.0 0.0 \n SINCE SEP 1 0.0 0.0 0.0 0.0 \n SINCE JUL 1 0.0 0.0 0.0 0.0 \n SNOW DEPTH 0 \n\nDEGREE DAYS \n HEATING \n YESTERDAY 2 5 -3 5 \n MONTH TO DATE 2 14 -12 14 \n SINCE SEP 1 23 59 -36 21 \n SINCE JUL 1 23 60 -37 23 \n\n COOLING \n YESTERDAY 0 2 -2 0 \n MONTH TO DATE 19 6 13 0 \n SINCE SEP 1 217 158 59 170 \n SINCE JAN 1 1497 1214 283 1318 \n...................................................................\n\n\nWIND (MPH) \n HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION N (20) \n HIGHEST GUST SPEED 28 HIGHEST GUST DIRECTION N (20) \n AVERAGE WIND SPEED 4.6 \n\n\nSKY COVER \n AVERAGE SKY COVER 0.9 \n\n\nWEATHER CONDITIONS \nTHE FOLLOWING WEATHER WAS RECORDED YESTERDAY. \n LIGHT RAIN \n FOG \n\n\nRELATIVE HUMIDITY (PERCENT)\n HIGHEST 90 11:00 PM \n LOWEST 60 2:00 PM \n AVERAGE 75 \n\n..........................................................\n\n\nTHE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY\n NORMAL RECORD YEAR \n MAXIMUM TEMPERATURE (F) 72 90 2013 \n MINIMUM TEMPERATURE (F) 50 26 1974 \n\n\nSUNRISE AND SUNSET \nOCTOBER 4 2026.......SUNRISE 7:09 AM EDT SUNSET 6:48 PM EDT \nOCTOBER 5 2026.......SUNRISE 7:10 AM EDT SUNSET 6:46 PM EDT \n\n\n- INDICATES NEGATIVE NUMBERS.\nR INDICATES RECORD WAS SET OR TIED.\nMM INDICATES DATA IS MISSING.\nT INDICATES TRACE AMOUNT.\n\n\n\n\n$$"}],"html":"https://weathermarket.io/nws-cli/KIAD/2026-10-03","json":"https://weathermarket.io/api/nws-cli/KIAD/2026-10-03"},"about":{"product":"NWS Climatological Report (CLI): the daily climate summary issued by the local NWS forecast office from the station's 1-minute ASOS record, normally 1-3 hours after local midnight (final, 'YESTERDAY') and once during the day (interim, 'TODAY AS OF'). Corrections are re-issued under the same PIL with CORRECTED in the text.","settlementRule":"The settlement value for a date is the latest final CLI issued for that date; a corrected re-issue supersedes earlier issues. Interim same-day products never settle. This is the same rule that fills values.nwsOfficial in /api/station/{icao}/daily.","archive":"Every issue is stored verbatim as received - nothing is edited or re-derived. Products are held from 2026-09-01 (backfilled from the IEM AFOS archive) and ingested live from api.weather.gov since 2026-11-10, polled every 30 minutes. A date with no final CLI 14 hours after local midnight is reported as not_issued rather than filled in.","verify":["Each issue carries the NWS product id (api.weather.gov keeps products for a limited time) and a link to the IEM AFOS permanent archive of the same product.","rawTextSha256 is the SHA-256 of the stored product text; compare it with the text at either link to confirm nothing was altered.","Permalink pattern for market rules: https://weathermarket.io/nws-cli/KIAD/YYYY-MM-DD (HTML) and https://weathermarket.io/api/nws-cli/KIAD/YYYY-MM-DD (JSON)."],"citation":"Settlement source: the final NWS Climatological Report (CLI) for station KIAD for the contract date, as archived verbatim at https://weathermarket.io/nws-cli/KIAD/YYYY-MM-DD with links to the NWS product and the IEM archive. A CORRECTED re-issue published before the settlement time supersedes earlier issues."}}