NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-05 · 2026-09-07 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-07 02:29:00 EDT · Product id iem:CDUS41-KLWX-070629:IAD:2026-09-06:final · IEM archive
Product id iem:CDUS41-KLWX-070629:IAD:2026-09-06:final · iem-afos · IEM archive
SHA-256 6469bcd68e2b78432c1756369fee40275ebdfaba609998a08e53ff6709c75e3c
Product text
CDUS41 KLWX 070629
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
229 AM EDT MON SEP 07 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 6 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 83 1:38 PM 100 2023 83 0 94
MINIMUM 61 6:01 AM 45 1972 61 0 63
1976
AVERAGE 72 72 0 79
PRECIPITATION (IN)
YESTERDAY 0.00 5.11 2008 0.12 -0.12 0.02
MONTH TO DATE 0.83 0.73 0.10 0.02
SINCE SEP 1 0.83 0.73 0.10 0.02
SINCE JAN 1 30.23 29.95 0.28 24.66
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 7 7 0 14
MONTH TO DATE 86 47 39 38
SINCE SEP 1 86 47 39 38
SINCE JAN 1 1366 1103 263 1186
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NE (30)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 5.9
SKY COVER
AVERAGE SKY COVER 0.2
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 96 5:00 AM
LOWEST 42 3:00 PM
AVERAGE 69
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 82 97 2023
MINIMUM TEMPERATURE (F) 61 41 1976
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.
$$Product id iem:CDUS41-KLWX-062123:IAD:2026-09-06:interim · iem-afos · IEM archive
SHA-256 aa83acac043600655472a8ee150ee4262793ad7252492cdbe9ac9136c6389417
Product text
CDUS41 KLWX 062123
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
523 PM EDT SUN SEP 06 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 6 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 83 1:38 PM 100 2023 83 0 94
MINIMUM 61 6:01 AM 45 1972 61 0 63
1976
AVERAGE 72 72 0 79
PRECIPITATION (IN)
TODAY 0.00 5.11 2008 0.12 -0.12 0.02
MONTH TO DATE 0.83 0.73 0.10 0.02
SINCE SEP 1 0.83 0.73 0.10 0.02
SINCE JAN 1 30.23 29.95 0.28 24.66
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 7 7 0 14
MONTH TO DATE 86 47 39 38
SINCE SEP 1 86 47 39 38
SINCE JAN 1 1366 1103 263 1186
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION N (360)
AVERAGE WIND SPEED 6.1
SKY COVER
AVERAGE SKY COVER 0.2
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 96 5:00 AM
LOWEST 42 3:00 PM
AVERAGE 69
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 82 97 2023
MINIMUM TEMPERATURE (F) 61 41 1976
SUNRISE AND SUNSET
SEPTEMBER 6 2026.....SUNRISE 6:43 AM EDT SUNSET 7:32 PM EDT
SEPTEMBER 7 2026.....SUNRISE 6:44 AM EDT SUNSET 7:31 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/2026-09-06 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.