NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-10-27 · 2026-10-29 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-29 02:23:00 EDT · Product id iem:CDUS41-KLWX-290623:IAD:2026-10-28:final · IEM archive
Product id iem:CDUS41-KLWX-290623:IAD:2026-10-28:final · iem-afos · IEM archive
SHA-256 9d78bf6dc5c074e0309034747d00539c3e052cbd25aef4289c99c9ad9a1a892c
Product text
CDUS41 KLWX 290623
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
223 AM EDT THU OCT 29 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 28 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 67 1:26 PM 86 2023 64 3 58
MINIMUM 45 5:12 AM 22 1976 41 4 39
AVERAGE 56 52 4 49
PRECIPITATION (IN)
YESTERDAY 0.00 1.97 2015 0.11 -0.11 T
MONTH TO DATE 3.61 3.31 0.30 0.97
SINCE SEP 1 7.41 7.25 0.16 2.19
SINCE JAN 1 36.81 36.47 0.34 26.83
SNOWFALL (IN)
YESTERDAY 0.0 MM MM 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 9 13 -4 16
MONTH TO DATE 170 242 -72 221
SINCE SEP 1 191 287 -96 228
SINCE JUL 1 191 288 -97 230
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 9 HIGHEST WIND DIRECTION SE (150)
HIGHEST GUST SPEED 13 HIGHEST GUST DIRECTION SE (140)
AVERAGE WIND SPEED 1.6
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 5:00 AM
LOWEST 56 1:00 PM
AVERAGE 78
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 63 82 1984
MINIMUM TEMPERATURE (F) 41 19 1976
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.
$$Product id iem:CDUS41-KLWX-282129:IAD:2026-10-28:interim · iem-afos · IEM archive
SHA-256 7a5efa2a861612f598811b4e79ee16bbc7829043a226d3b7d0af0945de67c8e7
Product text
CDUS41 KLWX 282129
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
529 PM EDT WED OCT 28 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 28 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 67 1:26 PM 86 2023 64 3 58
MINIMUM 45 5:12 AM 22 1976 41 4 39
AVERAGE 56 52 4 49
PRECIPITATION (IN)
TODAY 0.00 1.97 2015 0.11 -0.11 T
MONTH TO DATE 3.61 3.31 0.30 0.97
SINCE SEP 1 7.41 7.25 0.16 2.19
SINCE JAN 1 36.81 36.47 0.34 26.83
SNOWFALL (IN)
TODAY 0.0 MM MM 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 9 13 -4 16
MONTH TO DATE 170 242 -72 221
SINCE SEP 1 191 287 -96 228
SINCE JUL 1 191 288 -97 230
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 9 HIGHEST WIND DIRECTION SE (150)
HIGHEST GUST SPEED 13 HIGHEST GUST DIRECTION SE (140)
AVERAGE WIND SPEED 1.6
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 5:00 AM
LOWEST 56 1:00 PM
AVERAGE 78
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 63 82 1984
MINIMUM TEMPERATURE (F) 41 19 1976
SUNRISE AND SUNSET
OCTOBER 28 2026.......SUNRISE 7:33 AM EDT SUNSET 6:14 PM EDT
OCTOBER 29 2026.......SUNRISE 7:34 AM EDT SUNSET 6:13 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/2026-10-28 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.