{"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":"2026-09-21","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":73,"tminF":64,"precipIn":0.57,"precipTrace":false,"tmax":22.78,"tmin":17.78,"precip":14.48,"issuedAt":"2026-09-22T06:24:00.000Z","productId":"iem:CDUS41-KLWX-220624:IAD:2026-09-21:final","corrected":false,"reissues":0,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLIIAD&e=202609220624"},"issues":[{"kind":"interim","asOfLocal":"0500 PM","issuedAt":"2026-09-21T21:32:00.000Z","issuedLocal":"532 PM EDT MON SEP 21 2026","office":"KLWX","wmoHeader":"CDUS41 KLWX 212132","productId":"iem:CDUS41-KLWX-212132:IAD:2026-09-21:interim","source":"iem-afos","corrected":false,"tmaxF":73,"tmaxTimeLocal":"10:49 AM","tminF":64,"tminTimeLocal":"3:59 PM","precipIn":0.49,"precipTrace":false,"snowIn":0,"snowTrace":false,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLIIAD&e=202609212132","parseProblems":[],"rawTextSha256":"b50a98388a743fdf5955ce11f05f3829b76d3dd7b1dbf34e0c02ec525b5d88ee","rawText":"CDUS41 KLWX 212132\nCLIIAD\n\nCLIMATE REPORT \nNATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC \n532 PM EDT MON SEP 21 2026\n\n...................................\n\n...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 21 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 73 10:49 AM 92 1965 77 -4 74 \n 1998 \n MINIMUM 64 3:59 PM 33 1962 56 8 66 \n AVERAGE 69 67 2 70 \n\nPRECIPITATION (IN) \n TODAY 0.49 2.59 1979 0.13 0.36 0.00 \n MONTH TO DATE 2.12 2.74 -0.62 1.05 \n SINCE SEP 1 2.12 2.74 -0.62 1.05 \n SINCE JAN 1 31.52 31.96 -0.44 25.69 \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 0 2 -2 0 \n MONTH TO DATE 0 16 -16 7 \n SINCE SEP 1 0 16 -16 7 \n SINCE JUL 1 0 17 -17 9 \n\n COOLING \n TODAY 4 4 0 5 \n MONTH TO DATE 191 128 63 101 \n SINCE SEP 1 191 128 63 101 \n SINCE JAN 1 1471 1184 287 1249 \n...................................................................\n\n\nWIND (MPH) \n HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NE (30) \n HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION NE (30) \n AVERAGE WIND SPEED 8.2 \n\n\nSKY COVER \n AVERAGE SKY COVER 0.8 \n\n\nWEATHER CONDITIONS \nTHE FOLLOWING WEATHER WAS RECORDED TODAY. \n THUNDERSTORM \n RAIN \n LIGHT RAIN \n FOG \n\n\nRELATIVE HUMIDITY (PERCENT)\n HIGHEST 96 4:00 PM \n LOWEST 68 11:00 AM \n AVERAGE 82 \n\n..........................................................\n\n\nTHE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW\n NORMAL RECORD YEAR \n MAXIMUM TEMPERATURE (F) 77 94 1970 \n 1980 \n 2010 \n MINIMUM TEMPERATURE (F) 56 35 1962 \n\n\nSUNRISE AND SUNSET \nSEPTEMBER 21 2026.....SUNRISE 6:57 AM EDT SUNSET 7:08 PM EDT \nSEPTEMBER 22 2026.....SUNRISE 6:58 AM EDT SUNSET 7:07 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":"2026-09-22T06:24:00.000Z","issuedLocal":"224 AM EDT TUE SEP 22 2026","office":"KLWX","wmoHeader":"CDUS41 KLWX 220624","productId":"iem:CDUS41-KLWX-220624:IAD:2026-09-21:final","source":"iem-afos","corrected":false,"tmaxF":73,"tmaxTimeLocal":"10:49 AM","tminF":64,"tminTimeLocal":"11:59 PM","precipIn":0.57,"precipTrace":false,"snowIn":0,"snowTrace":false,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLIIAD&e=202609220624","parseProblems":[],"rawTextSha256":"8bdc18a68250cb63506dae24019df14bf397dd16606f5e9601e6241b54c97b0d","rawText":"CDUS41 KLWX 220624\nCLIIAD\n\nCLIMATE REPORT \nNATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC \n224 AM EDT TUE SEP 22 2026\n\n...................................\n\n...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 21 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 73 10:49 AM 92 1965 77 -4 74 \n 1998 \n MINIMUM 64 11:59 PM 33 1962 56 8 66 \n AVERAGE 69 67 2 70 \n\nPRECIPITATION (IN) \n YESTERDAY 0.57 2.59 1979 0.13 0.44 0.00 \n MONTH TO DATE 2.20 2.74 -0.54 1.05 \n SINCE SEP 1 2.20 2.74 -0.54 1.05 \n SINCE JAN 1 31.60 31.96 -0.36 25.69 \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 0 2 -2 0 \n MONTH TO DATE 0 16 -16 7 \n SINCE SEP 1 0 16 -16 7 \n SINCE JUL 1 0 17 -17 9 \n\n COOLING \n YESTERDAY 4 4 0 5 \n MONTH TO DATE 191 128 63 101 \n SINCE SEP 1 191 128 63 101 \n SINCE JAN 1 1471 1184 287 1249 \n...................................................................\n\n\nWIND (MPH) \n HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NE (30) \n HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION NE (30) \n AVERAGE WIND SPEED 7.5 \n\n\nSKY COVER \n AVERAGE SKY COVER 0.9 \n\n\nWEATHER CONDITIONS \nTHE FOLLOWING WEATHER WAS RECORDED YESTERDAY. \n THUNDERSTORM \n RAIN \n LIGHT RAIN \n FOG \n\n\nRELATIVE HUMIDITY (PERCENT)\n HIGHEST 97 10:00 PM \n LOWEST 68 11:00 AM \n AVERAGE 83 \n\n..........................................................\n\n\nTHE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY\n NORMAL RECORD YEAR \n MAXIMUM TEMPERATURE (F) 77 94 1970 \n 1980 \n 2010 \n MINIMUM TEMPERATURE (F) 56 35 1962 \n\n\nSUNRISE AND SUNSET \nSEPTEMBER 22 2026.....SUNRISE 6:58 AM EDT SUNSET 7:07 PM EDT \nSEPTEMBER 23 2026.....SUNRISE 6:58 AM EDT SUNSET 7:05 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/2026-09-21","json":"https://weathermarket.io/api/nws-cli/KIAD/2026-09-21"},"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."}}