{"station":{"icao":"KSEA","cliId":"SEA","pil":"CLISEA","city":{"slug":"seattle","name":"시애틀","country":"United States"},"timezone":"America/Los_Angeles","feed":"https://api.weather.gov/products/types/CLI/locations/SEA","html":"https://weathermarket.io/nws-cli/KSEA","json":"https://weathermarket.io/api/nws-cli/KSEA"},"stationToday":"2026-11-14","day":{"date":"2026-09-17","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":77,"tminF":54,"precipIn":0,"precipTrace":false,"tmax":25,"tmin":12.22,"precip":0,"issuedAt":"2026-09-18T08:27:00.000Z","productId":"iem:CDUS46-KSEW-180827:SEA:2026-09-17:final","corrected":false,"reissues":0,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLISEA&e=202609180827"},"issues":[{"kind":"interim","asOfLocal":"0500 PM","issuedAt":"2026-09-18T01:18:00.000Z","issuedLocal":"618 PM PDT THU SEP 17 2026","office":"KSEW","wmoHeader":"CDUS46 KSEW 180118","productId":"iem:CDUS46-KSEW-180118:SEA:2026-09-17:interim","source":"iem-afos","corrected":false,"tmaxF":77,"tmaxTimeLocal":"341 PM","tminF":54,"tminTimeLocal":"557 AM","precipIn":0,"precipTrace":false,"snowIn":0,"snowTrace":false,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLISEA&e=202609180118","parseProblems":[],"rawTextSha256":"f212031845639db4bf2f09dd73eb6faa47babd29d59140c31d22fab98b780723","rawText":"CDUS46 KSEW 180118\nCLISEA\n\nCLIMATE REPORT \nNATIONAL WEATHER SERVICE SEATTLE\n618 PM PDT THU SEP 17 2026\n\n...................................\n\n...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 17 2026...\nVALID TODAY AS OF 0500 PM LOCAL TIME.\n\nCLIMATE NORMAL PERIOD 1991 TO 2020\nCLIMATE RECORD PERIOD 1945 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 77 341 PM 85 1991 72 5 78 \n MINIMUM 54 557 AM 41 1947 54 0 59 \n AVERAGE 66 62 4 69 \n\nPRECIPITATION (IN) \n TODAY 0.00 1.49 2010 0.06 -0.06 0.00 \n MONTH TO DATE 1.03 0.80 0.23 0.06 \n SINCE OCT 1 37.94 38.53 -0.59 28.97 \n SINCE JAN 1 21.16 22.59 -1.43 15.57 \n\nSNOWFALL (IN) \n TODAY 0.0 MM MM 0.0 \n MONTH TO DATE 0.0 0.0 \n SINCE OCT 1 3.0 2.3 \n SINCE JUL 1 0.0 0.0 \n SNOW DEPTH 0 \n\nDEGREE DAYS \n HEATING \n TODAY 0 3 -3 0 \n MONTH TO DATE 46 39 7 11 \n SINCE SEP 1 46 39 7 11 \n SINCE JUL 1 71 94 -23 35 \n\n COOLING \n TODAY 1 1 0 4 \n MONTH TO DATE 2 26 -24 34 \n SINCE SEP 1 2 26 -24 34 \n SINCE JAN 1 267 259 8 328 \n...................................................................\n\n\nWIND (MPH) \n RESULTANT WIND SPEED 4 RESULTANT WIND DIRECTION N (350) \n HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION N (360) \n HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION NE (30) \n AVERAGE WIND SPEED 6.6 \n\n\nSKY COVER \n AVERAGE SKY COVER 0.1 \n\n\nWEATHER CONDITIONS \nTHE FOLLOWING WEATHER WAS RECORDED TODAY. \n NO SIGNIFICANT WEATHER WAS OBSERVED. \n\n\nRELATIVE HUMIDITY (PERCENT)\n HIGHEST 90 500 AM \n LOWEST 43 400 PM \n AVERAGE 67 \n\n..........................................................\n\n\nTHE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW\n NORMAL RECORD YEAR \n MAXIMUM TEMPERATURE (F) 71 85 1991 \n MINIMUM TEMPERATURE (F) 53 38 1947 \n\n\nSUNRISE AND SUNSET \nSEPTEMBER 17 2026.....SUNRISE 650 AM PDT SUNSET 717 PM PDT \nSEPTEMBER 18 2026.....SUNRISE 651 AM PDT SUNSET 715 PM PDT \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":"2026-09-18T08:27:00.000Z","issuedLocal":"127 AM PDT FRI SEP 18 2026","office":"KSEW","wmoHeader":"CDUS46 KSEW 180827","productId":"iem:CDUS46-KSEW-180827:SEA:2026-09-17:final","source":"iem-afos","corrected":false,"tmaxF":77,"tmaxTimeLocal":"341 PM","tminF":54,"tminTimeLocal":"557 AM","precipIn":0,"precipTrace":false,"snowIn":0,"snowTrace":false,"nwsProductUrl":null,"iemArchiveUrl":"https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=CLISEA&e=202609180827","parseProblems":[],"rawTextSha256":"b6d3dcbe605c188de36846f038719a16cb5bbd229d9629a1c5c8a6068fe6e3cd","rawText":"CDUS46 KSEW 180827\nCLISEA\n\nCLIMATE REPORT \nNATIONAL WEATHER SERVICE SEATTLE\n127 AM PDT FRI SEP 18 2026\n\n...................................\n\n...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 17 2026...\n\nCLIMATE NORMAL PERIOD 1991 TO 2020\nCLIMATE RECORD PERIOD 1945 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 77 341 PM 85 1991 72 5 78 \n MINIMUM 54 557 AM 41 1947 54 0 59 \n AVERAGE 66 62 4 69 \n\nPRECIPITATION (IN) \n YESTERDAY 0.00 1.49 2010 0.06 -0.06 0.00 \n MONTH TO DATE 1.03 0.80 0.23 0.06 \n SINCE OCT 1 37.94 38.53 -0.59 28.97 \n SINCE JAN 1 21.16 22.59 -1.43 15.57 \n\nSNOWFALL (IN) \n YESTERDAY 0.0 MM MM 0.0 \n MONTH TO DATE 0.0 0.0 \n SINCE OCT 1 3.0 2.3 \n SINCE JUL 1 0.0 0.0 \n SNOW DEPTH 0 \n\nDEGREE DAYS \n HEATING \n YESTERDAY 0 3 -3 0 \n MONTH TO DATE 46 39 7 11 \n SINCE SEP 1 46 39 7 11 \n SINCE JUL 1 71 94 -23 35 \n\n COOLING \n YESTERDAY 1 1 0 4 \n MONTH TO DATE 2 26 -24 34 \n SINCE SEP 1 2 26 -24 34 \n SINCE JAN 1 267 259 8 328 \n...................................................................\n\n\nWIND (MPH) \n RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION N (350) \n HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION N (360) \n HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION NE (30) \n AVERAGE WIND SPEED 5.8 \n\n\nSKY COVER \n AVERAGE SKY COVER 0.1 \n\n\nWEATHER CONDITIONS \nTHE FOLLOWING WEATHER WAS RECORDED YESTERDAY. \n NO SIGNIFICANT WEATHER WAS OBSERVED. \n\n\nRELATIVE HUMIDITY (PERCENT)\n HIGHEST 90 500 AM \n LOWEST 42 700 PM \n AVERAGE 66 \n\n..........................................................\n\n\nTHE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY\n NORMAL RECORD YEAR \n MAXIMUM TEMPERATURE (F) 71 85 1991 \n MINIMUM TEMPERATURE (F) 53 38 1947 \n\n\nSUNRISE AND SUNSET \nSEPTEMBER 18 2026.....SUNRISE 651 AM PDT SUNSET 715 PM PDT \nSEPTEMBER 19 2026.....SUNRISE 652 AM PDT SUNSET 713 PM PDT \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/KSEA/2026-09-17","json":"https://weathermarket.io/api/nws-cli/KSEA/2026-09-17"},"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/KSEA/YYYY-MM-DD (HTML) and https://weathermarket.io/api/nws-cli/KSEA/YYYY-MM-DD (JSON)."],"citation":"Settlement source: the final NWS Climatological Report (CLI) for station KSEA for the contract date, as archived verbatim at https://weathermarket.io/nws-cli/KSEA/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."}}