{"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":"2026-09-08","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":86,"tminF":57,"precipIn":0,"precipTrace":false,"tmax":30,"tmin":13.89,"precip":0,"issuedAt":"2026-09-09T06:31:00.000Z","productId":"iem:CDUS41-KLWX-090631:IAD:2026-09-08:final","corrected":false,"reissues":0,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLIIAD&e=202609090631"},"issues":[{"kind":"interim","asOfLocal":"0500 PM","issuedAt":"2026-09-08T21:23:00.000Z","issuedLocal":"523 PM EDT TUE SEP 08 2026","office":"KLWX","wmoHeader":"CDUS41 KLWX 082123","productId":"iem:CDUS41-KLWX-082123:IAD:2026-09-08:interim","source":"iem-afos","corrected":false,"tmaxF":86,"tmaxTimeLocal":"3:49 PM","tminF":57,"tminTimeLocal":"5:59 AM","precipIn":0,"precipTrace":false,"snowIn":0,"snowTrace":false,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLIIAD&e=202609082123","parseProblems":[],"rawTextSha256":"76bf576343562259a4a6f0af1cedee2727930d233f9a75cb9ee833ba7a5385be","rawText":"CDUS41 KLWX 082123\nCLIIAD\n\nCLIMATE REPORT \nNATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC \n523 PM EDT TUE SEP 08 2026\n\n...................................\n\n...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 8 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 86 3:49 PM 96 2016 82 4 76 \n MINIMUM 57 5:59 AM 43 1984 61 -4 47 \n AVERAGE 72 72 0 62 \n\nPRECIPITATION (IN) \n TODAY 0.00 3.56 1987 0.12 -0.12 0.00 \n MONTH TO DATE 0.83 0.97 -0.14 0.03 \n SINCE SEP 1 0.83 0.97 -0.14 0.03 \n SINCE JAN 1 30.23 30.19 0.04 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 3 \n MONTH TO DATE 0 0 0 3 \n SINCE SEP 1 0 0 0 3 \n SINCE JUL 1 0 1 -1 5 \n\n COOLING \n TODAY 7 7 0 0 \n MONTH TO DATE 98 61 37 38 \n SINCE SEP 1 98 61 37 38 \n SINCE JAN 1 1378 1117 261 1186 \n...................................................................\n\n\nWIND (MPH) \n HIGHEST WIND SPEED 9 HIGHEST WIND DIRECTION S (190) \n HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION SW (230) \n AVERAGE WIND SPEED 2.4 \n\n\nSKY COVER \n AVERAGE SKY COVER 0.3 \n\n\nWEATHER CONDITIONS \nTHE FOLLOWING WEATHER WAS RECORDED TODAY. \n NO SIGNIFICANT WEATHER WAS OBSERVED. \n\n\nRELATIVE HUMIDITY (PERCENT)\n HIGHEST 97 3:00 AM \n LOWEST 45 4:00 PM \n AVERAGE 71 \n\n..........................................................\n\n\nTHE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW\n NORMAL RECORD YEAR \n MAXIMUM TEMPERATURE (F) 82 98 2016 \n MINIMUM TEMPERATURE (F) 61 40 1986 \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$$"},{"kind":"final","asOfLocal":null,"issuedAt":"2026-09-09T06:31:00.000Z","issuedLocal":"231 AM EDT WED SEP 09 2026","office":"KLWX","wmoHeader":"CDUS41 KLWX 090631","productId":"iem:CDUS41-KLWX-090631:IAD:2026-09-08:final","source":"iem-afos","corrected":false,"tmaxF":86,"tmaxTimeLocal":"3:49 PM","tminF":57,"tminTimeLocal":"5:59 AM","precipIn":0,"precipTrace":false,"snowIn":0,"snowTrace":false,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLIIAD&e=202609090631","parseProblems":[],"rawTextSha256":"afc0d492ee1df5961ee5b971de67d8052dd574884521af06eb1642217c20008d","rawText":"CDUS41 KLWX 090631\nCLIIAD\n\nCLIMATE REPORT \nNATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC \n231 AM EDT WED SEP 09 2026\n\n...................................\n\n...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 8 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 86 3:49 PM 96 2016 82 4 76 \n MINIMUM 57 5:59 AM 43 1984 61 -4 47 \n AVERAGE 72 72 0 62 \n\nPRECIPITATION (IN) \n YESTERDAY 0.00 3.56 1987 0.12 -0.12 0.00 \n MONTH TO DATE 0.83 0.97 -0.14 0.03 \n SINCE SEP 1 0.83 0.97 -0.14 0.03 \n SINCE JAN 1 30.23 30.19 0.04 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 3 \n MONTH TO DATE 0 0 0 3 \n SINCE SEP 1 0 0 0 3 \n SINCE JUL 1 0 1 -1 5 \n\n COOLING \n YESTERDAY 7 7 0 0 \n MONTH TO DATE 98 61 37 38 \n SINCE SEP 1 98 61 37 38 \n SINCE JAN 1 1378 1117 261 1186 \n...................................................................\n\n\nWIND (MPH) \n HIGHEST WIND SPEED 9 HIGHEST WIND DIRECTION S (190) \n HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION SW (230) \n AVERAGE WIND SPEED 3.3 \n\n\nSKY COVER \n AVERAGE SKY COVER 0.4 \n\n\nWEATHER CONDITIONS \nTHE FOLLOWING WEATHER WAS RECORDED YESTERDAY. \n NO SIGNIFICANT WEATHER WAS OBSERVED. \n\n\nRELATIVE HUMIDITY (PERCENT)\n HIGHEST 97 3:00 AM \n LOWEST 45 4:00 PM \n AVERAGE 71 \n\n..........................................................\n\n\nTHE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY\n NORMAL RECORD YEAR \n MAXIMUM TEMPERATURE (F) 82 98 2016 \n MINIMUM TEMPERATURE (F) 61 40 1986 \n\n\nSUNRISE AND SUNSET \nSEPTEMBER 9 2026.....SUNRISE 6:46 AM EDT SUNSET 7:28 PM EDT \nSEPTEMBER 10 2026.....SUNRISE 6:47 AM EDT SUNSET 7:26 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/2026-09-08","json":"https://weathermarket.io/api/nws-cli/KIAD/2026-09-08"},"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."}}