NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-10-28 · 2026-10-30 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-30 02:24:00 EDT · Product id iem:CDUS41-KLWX-300624:IAD:2026-10-29:final · IEM archive
Product id iem:CDUS41-KLWX-300624:IAD:2026-10-29:final · iem-afos · IEM archive
SHA-256 9bbd6008ec4640431e8d70532e535c6da1b5a91fcf217c821eef18349c213f21
Product text
CDUS41 KLWX 300624
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
224 AM EDT FRI OCT 30 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 29 2026...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1960 TO 2026
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...................................................................
TEMPERATURE (F)
YESTERDAY
MAXIMUM 73 4:05 PM 82 1984 63 10 58
MINIMUM 50 6:55 AM 19 1976 41 9 47
AVERAGE 62 52 10 53
PRECIPITATION (IN)
YESTERDAY 0.00 4.26 2012 0.12 -0.12 0.58
MONTH TO DATE 3.61 3.43 0.18 1.55
SINCE SEP 1 7.41 7.37 0.04 2.77
SINCE JAN 1 36.81 36.59 0.22 27.41
SNOWFALL (IN)
YESTERDAY 0.0 0.6 2011 0.0 0.0 0.0
MONTH TO DATE 0.0 0.0 0.0 0.0
SINCE SEP 1 0.0 0.0 0.0 0.0
SINCE JUL 1 0.0 0.0 0.0 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 3 13 -10 12
MONTH TO DATE 173 255 -82 233
SINCE SEP 1 194 300 -106 240
SINCE JUL 1 194 301 -107 242
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 44 19 25 12
SINCE SEP 1 268 171 97 182
SINCE JAN 1 1548 1227 321 1330
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION S (170)
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION S (160)
AVERAGE WIND SPEED 2.9
SKY COVER
AVERAGE SKY COVER 0.3
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 6:00 AM
LOWEST 48 3:00 PM
AVERAGE 74
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 63 84 2016
MINIMUM TEMPERATURE (F) 40 20 1969
SUNRISE AND SUNSET
OCTOBER 30 2026.......SUNRISE 7:35 AM EDT SUNSET 6:11 PM EDT
OCTOBER 31 2026.......SUNRISE 7:36 AM EDT SUNSET 6:10 PM EDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$Product id iem:CDUS41-KLWX-292127:IAD:2026-10-29:interim · iem-afos · IEM archive
SHA-256 dee61e16c3a5c70727540b60e67776e90a58783f1250d1ee50a350c37d9c5ea6
Product text
CDUS41 KLWX 292127
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
527 PM EDT THU OCT 29 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 29 2026...
VALID TODAY AS OF 0500 PM LOCAL TIME.
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1960 TO 2026
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...................................................................
TEMPERATURE (F)
TODAY
MAXIMUM 73 3:59 PM 82 1984 63 10 58
MINIMUM 50 6:55 AM 19 1976 41 9 47
AVERAGE 62 52 10 53
PRECIPITATION (IN)
TODAY 0.00 4.26 2012 0.12 -0.12 0.58
MONTH TO DATE 3.61 3.43 0.18 1.55
SINCE SEP 1 7.41 7.37 0.04 2.77
SINCE JAN 1 36.81 36.59 0.22 27.41
SNOWFALL (IN)
TODAY 0.0 0.6 2011 0.0 0.0 0.0
MONTH TO DATE 0.0 0.0 0.0 0.0
SINCE SEP 1 0.0 0.0 0.0 0.0
SINCE JUL 1 0.0 0.0 0.0 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
TODAY 3 13 -10 12
MONTH TO DATE 173 255 -82 233
SINCE SEP 1 194 300 -106 240
SINCE JUL 1 194 301 -107 242
COOLING
TODAY 0 0 0 0
MONTH TO DATE 44 19 25 12
SINCE SEP 1 268 171 97 182
SINCE JAN 1 1548 1227 321 1330
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION S (170)
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION S (160)
AVERAGE WIND SPEED 2.3
SKY COVER
AVERAGE SKY COVER 0.4
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 6:00 AM
LOWEST 48 3:00 PM
AVERAGE 74
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 63 84 2016
MINIMUM TEMPERATURE (F) 40 20 1969
SUNRISE AND SUNSET
OCTOBER 29 2026.......SUNRISE 7:34 AM EDT SUNSET 6:13 PM EDT
OCTOBER 30 2026.......SUNRISE 7:35 AM EDT SUNSET 6:11 PM EDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$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/2026-10-29 with links to the NWS product and the IEM archive. A CORRECTED re-issue published before the settlement time supersedes earlier issues.
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.
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.