NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-09 · 2026-09-11 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-11 02:24:00 EDT · Product id iem:CDUS41-KLWX-110624:IAD:2026-09-10:final · IEM archive
Product id iem:CDUS41-KLWX-110624:IAD:2026-09-10:final · iem-afos · IEM archive
SHA-256 6e37852500199ad29dbd2e198778da5673409ff2d0f27490adce4dc0a898ad44
Product text
CDUS41 KLWX 110624
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
224 AM EDT FRI SEP 11 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 10 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 88 4:10 PM 99 1983 82 6 72
MINIMUM 71 6:06 AM 43 1981 60 11 59
AVERAGE 80 71 9 66
PRECIPITATION (IN)
YESTERDAY 0.00 1.50 1968 0.12 -0.12 0.15
MONTH TO DATE 0.83 1.22 -0.39 0.18
SINCE SEP 1 0.83 1.22 -0.39 0.18
SINCE JAN 1 30.23 30.44 -0.21 24.82
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 0 1 -1 0
MONTH TO DATE 0 1 -1 6
SINCE SEP 1 0 1 -1 6
SINCE JUL 1 0 2 -2 8
COOLING
YESTERDAY 15 6 9 1
MONTH TO DATE 126 74 52 39
SINCE SEP 1 126 74 52 39
SINCE JAN 1 1406 1130 276 1187
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION W (290)
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION S (200)
AVERAGE WIND SPEED 7.9
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 76 5:00 AM
LOWEST 54 2:00 PM
AVERAGE 65
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 81 99 1983
MINIMUM TEMPERATURE (F) 60 40 1976
SUNRISE AND SUNSET
SEPTEMBER 11 2026.....SUNRISE 6:48 AM EDT SUNSET 7:24 PM EDT
SEPTEMBER 12 2026.....SUNRISE 6:49 AM EDT SUNSET 7:23 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-102139:IAD:2026-09-10:interim · iem-afos · IEM archive
SHA-256 49cdbd399ec04bc79e27d59ac0418ef7b0002f07478fb0df82197698bf0bb28d
Product text
CDUS41 KLWX 102139
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
539 PM EDT THU SEP 10 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 10 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 88 3:39 PM 99 1983 82 6 72
MINIMUM 71 6:06 AM 43 1981 60 11 59
AVERAGE 80 71 9 66
PRECIPITATION (IN)
TODAY 0.00 1.50 1968 0.12 -0.12 0.15
MONTH TO DATE 0.83 1.22 -0.39 0.18
SINCE SEP 1 0.83 1.22 -0.39 0.18
SINCE JAN 1 30.23 30.44 -0.21 24.82
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 0 1 -1 0
MONTH TO DATE 0 1 -1 6
SINCE SEP 1 0 1 -1 6
SINCE JUL 1 0 2 -2 8
COOLING
TODAY 15 6 9 1
MONTH TO DATE 126 74 52 39
SINCE SEP 1 126 74 52 39
SINCE JAN 1 1406 1130 276 1187
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION W (290)
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION S (200)
AVERAGE WIND SPEED 8.5
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 76 5:00 AM
LOWEST 54 2:00 PM
AVERAGE 65
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 81 99 1983
MINIMUM TEMPERATURE (F) 60 40 1976
SUNRISE AND SUNSET
SEPTEMBER 10 2026.....SUNRISE 6:47 AM EDT SUNSET 7:26 PM EDT
SEPTEMBER 11 2026.....SUNRISE 6:48 AM EDT SUNSET 7:24 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/2026-09-10 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.