NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-06 · 2026-09-08 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-08 02:31:00 EDT · Product id iem:CDUS41-KLWX-080631:IAD:2026-09-07:final · IEM archive
Product id iem:CDUS41-KLWX-080631:IAD:2026-09-07:final · iem-afos · IEM archive
SHA-256 7a8addbc15367bd8a9c4de76e8dfdee80eb0d06c1c4c0fbc0036cd0d9801d074
Product text
CDUS41 KLWX 080631
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
231 AM EDT TUE SEP 08 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 7 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 81 4:20 PM 97 2023 82 -1 78
MINIMUM 59 4:42 AM 41 1976 61 -2 51
AVERAGE 70 72 -2 65
PRECIPITATION (IN)
YESTERDAY 0.00 1.11 2011 0.12 -0.12 0.01
MONTH TO DATE 0.83 0.85 -0.02 0.03
SINCE SEP 1 0.83 0.85 -0.02 0.03
SINCE JAN 1 30.23 30.07 0.16 24.67
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 0 0 0
MONTH TO DATE 0 0 0 0
SINCE SEP 1 0 0 0 0
SINCE JUL 1 0 1 -1 2
COOLING
YESTERDAY 5 7 -2 0
MONTH TO DATE 91 54 37 38
SINCE SEP 1 91 54 37 38
SINCE JAN 1 1371 1110 261 1186
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION N (10)
AVERAGE WIND SPEED 3.4
SKY COVER
AVERAGE SKY COVER 0.2
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 90 1:00 AM
LOWEST 39 4:00 PM
AVERAGE 65
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 82 96 2016
MINIMUM TEMPERATURE (F) 61 43 1984
SUNRISE AND SUNSET
SEPTEMBER 8 2026.....SUNRISE 6:45 AM EDT SUNSET 7:29 PM EDT
SEPTEMBER 9 2026.....SUNRISE 6:46 AM EDT SUNSET 7:28 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-072123:IAD:2026-09-07:interim · iem-afos · IEM archive
SHA-256 9f656b266f32d6812cde7cac20822bdb6da96ff9bb11af6f7c461f3354c4b8fa
Product text
CDUS41 KLWX 072123
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
523 PM EDT MON SEP 07 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 7 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 81 3:59 PM 97 2023 82 -1 78
MINIMUM 59 4:42 AM 41 1976 61 -2 51
AVERAGE 70 72 -2 65
PRECIPITATION (IN)
TODAY 0.00 1.11 2011 0.12 -0.12 0.01
MONTH TO DATE 0.83 0.85 -0.02 0.03
SINCE SEP 1 0.83 0.85 -0.02 0.03
SINCE JAN 1 30.23 30.07 0.16 24.67
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 0 0 0
MONTH TO DATE 0 0 0 0
SINCE SEP 1 0 0 0 0
SINCE JUL 1 0 1 -1 2
COOLING
TODAY 5 7 -2 0
MONTH TO DATE 91 54 37 38
SINCE SEP 1 91 54 37 38
SINCE JAN 1 1371 1110 261 1186
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION N (10)
AVERAGE WIND SPEED 3.9
SKY COVER
AVERAGE SKY COVER 0.2
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 90 1:00 AM
LOWEST 39 4:00 PM
AVERAGE 65
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 82 96 2016
MINIMUM TEMPERATURE (F) 61 43 1984
SUNRISE AND SUNSET
SEPTEMBER 7 2026.....SUNRISE 6:44 AM EDT SUNSET 7:31 PM EDT
SEPTEMBER 8 2026.....SUNRISE 6:45 AM EDT SUNSET 7:29 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/2026-09-07 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.