{"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":"2026-09-07","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":81,"tminF":59,"precipIn":0,"precipTrace":false,"tmax":27.22,"tmin":15,"precip":0,"issuedAt":"2026-09-08T06:31:00.000Z","productId":"iem:CDUS41-KLWX-080631:IAD:2026-09-07:final","corrected":false,"reissues":0,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLIIAD&e=202609080631"},"issues":[{"kind":"interim","asOfLocal":"0500 PM","issuedAt":"2026-09-07T21:23:00.000Z","issuedLocal":"523 PM EDT MON SEP 07 2026","office":"KLWX","wmoHeader":"CDUS41 KLWX 072123","productId":"iem:CDUS41-KLWX-072123:IAD:2026-09-07:interim","source":"iem-afos","corrected":false,"tmaxF":81,"tmaxTimeLocal":"3:59 PM","tminF":59,"tminTimeLocal":"4:42 AM","precipIn":0,"precipTrace":false,"snowIn":0,"snowTrace":false,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLIIAD&e=202609072123","parseProblems":[],"rawTextSha256":"9f656b266f32d6812cde7cac20822bdb6da96ff9bb11af6f7c461f3354c4b8fa","rawText":"CDUS41 KLWX 072123\nCLIIAD\n\nCLIMATE REPORT \nNATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC \n523 PM EDT MON SEP 07 2026\n\n...................................\n\n...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 7 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 81 3:59 PM 97 2023 82 -1 78 \n MINIMUM 59 4:42 AM 41 1976 61 -2 51 \n AVERAGE 70 72 -2 65 \n\nPRECIPITATION (IN) \n TODAY 0.00 1.11 2011 0.12 -0.12 0.01 \n MONTH TO DATE 0.83 0.85 -0.02 0.03 \n SINCE SEP 1 0.83 0.85 -0.02 0.03 \n SINCE JAN 1 30.23 30.07 0.16 24.67 \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 0 0 0 \n MONTH TO DATE 0 0 0 0 \n SINCE SEP 1 0 0 0 0 \n SINCE JUL 1 0 1 -1 2 \n\n COOLING \n TODAY 5 7 -2 0 \n MONTH TO DATE 91 54 37 38 \n SINCE SEP 1 91 54 37 38 \n SINCE JAN 1 1371 1110 261 1186 \n...................................................................\n\n\nWIND (MPH) \n HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION N (10) \n HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION N (10) \n AVERAGE WIND SPEED 3.9 \n\n\nSKY COVER \n AVERAGE SKY COVER 0.2 \n\n\nWEATHER CONDITIONS \nTHE FOLLOWING WEATHER WAS RECORDED TODAY. \n NO SIGNIFICANT WEATHER WAS OBSERVED. \n\n\nRELATIVE HUMIDITY (PERCENT)\n HIGHEST 90 1:00 AM \n LOWEST 39 4:00 PM \n AVERAGE 65 \n\n..........................................................\n\n\nTHE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW\n NORMAL RECORD YEAR \n MAXIMUM TEMPERATURE (F) 82 96 2016 \n MINIMUM TEMPERATURE (F) 61 43 1984 \n\n\nSUNRISE AND SUNSET \nSEPTEMBER 7 2026.....SUNRISE 6:44 AM EDT SUNSET 7:31 PM EDT \nSEPTEMBER 8 2026.....SUNRISE 6:45 AM EDT SUNSET 7:29 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":"2026-09-08T06:31:00.000Z","issuedLocal":"231 AM EDT TUE SEP 08 2026","office":"KLWX","wmoHeader":"CDUS41 KLWX 080631","productId":"iem:CDUS41-KLWX-080631:IAD:2026-09-07:final","source":"iem-afos","corrected":false,"tmaxF":81,"tmaxTimeLocal":"4:20 PM","tminF":59,"tminTimeLocal":"4:42 AM","precipIn":0,"precipTrace":false,"snowIn":0,"snowTrace":false,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLIIAD&e=202609080631","parseProblems":[],"rawTextSha256":"7a8addbc15367bd8a9c4de76e8dfdee80eb0d06c1c4c0fbc0036cd0d9801d074","rawText":"CDUS41 KLWX 080631\nCLIIAD\n\nCLIMATE REPORT \nNATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC \n231 AM EDT TUE SEP 08 2026\n\n...................................\n\n...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 7 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 81 4:20 PM 97 2023 82 -1 78 \n MINIMUM 59 4:42 AM 41 1976 61 -2 51 \n AVERAGE 70 72 -2 65 \n\nPRECIPITATION (IN) \n YESTERDAY 0.00 1.11 2011 0.12 -0.12 0.01 \n MONTH TO DATE 0.83 0.85 -0.02 0.03 \n SINCE SEP 1 0.83 0.85 -0.02 0.03 \n SINCE JAN 1 30.23 30.07 0.16 24.67 \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 0 0 0 \n MONTH TO DATE 0 0 0 0 \n SINCE SEP 1 0 0 0 0 \n SINCE JUL 1 0 1 -1 2 \n\n COOLING \n YESTERDAY 5 7 -2 0 \n MONTH TO DATE 91 54 37 38 \n SINCE SEP 1 91 54 37 38 \n SINCE JAN 1 1371 1110 261 1186 \n...................................................................\n\n\nWIND (MPH) \n HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION N (10) \n HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION N (10) \n AVERAGE WIND SPEED 3.4 \n\n\nSKY COVER \n AVERAGE SKY COVER 0.2 \n\n\nWEATHER CONDITIONS \nTHE FOLLOWING WEATHER WAS RECORDED YESTERDAY. \n NO SIGNIFICANT WEATHER WAS OBSERVED. \n\n\nRELATIVE HUMIDITY (PERCENT)\n HIGHEST 90 1:00 AM \n LOWEST 39 4:00 PM \n AVERAGE 65 \n\n..........................................................\n\n\nTHE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY\n NORMAL RECORD YEAR \n MAXIMUM TEMPERATURE (F) 82 96 2016 \n MINIMUM TEMPERATURE (F) 61 43 1984 \n\n\nSUNRISE AND SUNSET \nSEPTEMBER 8 2026.....SUNRISE 6:45 AM EDT SUNSET 7:29 PM EDT \nSEPTEMBER 9 2026.....SUNRISE 6:46 AM EDT SUNSET 7:28 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/2026-09-07","json":"https://weathermarket.io/api/nws-cli/KIAD/2026-09-07"},"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."}}