NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-03 · 2026-09-05 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-05 02:35:00 EDT · Product id iem:CDUS41-KLWX-050635:IAD:2026-09-04:final · IEM archive
Product id iem:CDUS41-KLWX-050635:IAD:2026-09-04:final · iem-afos · IEM archive
SHA-256 ba75183f3149213f2234bd0eb636ad7cbb891dcd57ac8372878090839bcaa8a8
Product text
CDUS41 KLWX 050635
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
235 AM EDT SAT SEP 05 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 4 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 91 2:16 PM 99 2023 83 8 87
MINIMUM 70 4:10 AM 48 1997 62 8 62
AVERAGE 81 73 8 75
PRECIPITATION (IN)
YESTERDAY 0.21 1.29 1996 0.12 0.09 T
MONTH TO DATE 0.83 0.49 0.34 T
SINCE SEP 1 0.83 0.49 0.34 T
SINCE JAN 1 30.23 29.71 0.52 24.64
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 MM
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 16 8 8 10
MONTH TO DATE 69 32 37 13
SINCE SEP 1 69 32 37 13
SINCE JAN 1 1349 1088 261 1161
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION W (290)
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION SW (240)
AVERAGE WIND SPEED 3.3
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
THUNDERSTORM
HEAVY RAIN
LIGHT RAIN
FOG
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 4:00 AM
LOWEST 54 2:00 PM
AVERAGE 77
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 83 99 2023
MINIMUM TEMPERATURE (F) 62 42 1997
SUNRISE AND SUNSET
SEPTEMBER 5 2026.....SUNRISE 6:42 AM EDT SUNSET 7:34 PM EDT
SEPTEMBER 6 2026.....SUNRISE 6:43 AM EDT SUNSET 7:32 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-042123:IAD:2026-09-04:interim · iem-afos · IEM archive
SHA-256 ad66fe84832d6d5a5ccdd35b08046a3440c184f73451e7f10378aff731e2b6d5
Product text
CDUS41 KLWX 042123
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
523 PM EDT FRI SEP 04 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 4 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 91 2:16 PM 99 2023 83 8 87
MINIMUM 70 4:10 AM 48 1997 62 8 62
AVERAGE 81 73 8 75
PRECIPITATION (IN)
TODAY 0.21 1.29 1996 0.12 0.09 T
MONTH TO DATE 0.83 0.49 0.34 T
SINCE SEP 1 0.83 0.49 0.34 T
SINCE JAN 1 30.23 29.71 0.52 24.64
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 16 8 8 10
MONTH TO DATE 69 32 37 13
SINCE SEP 1 69 32 37 13
SINCE JAN 1 1349 1088 261 1161
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION W (290)
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION SW (240)
AVERAGE WIND SPEED 5.2
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
THUNDERSTORM
HEAVY RAIN
LIGHT RAIN
FOG
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 4:00 AM
LOWEST 54 2:00 PM
AVERAGE 77
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 83 99 2023
MINIMUM TEMPERATURE (F) 62 42 1997
SUNRISE AND SUNSET
SEPTEMBER 4 2026.....SUNRISE 6:41 AM EDT SUNSET 7:35 PM EDT
SEPTEMBER 5 2026.....SUNRISE 6:42 AM EDT SUNSET 7:34 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/2026-09-04 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.