NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-02 · 2026-09-04 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-04 02:24:00 EDT · Product id iem:CDUS41-KLWX-040624:IAD:2026-09-03:final · IEM archive
Product id iem:CDUS41-KLWX-040624:IAD:2026-09-03:final · iem-afos · IEM archive
SHA-256 0601ae8128a1e84a6fc7606c6d192abb93349df06e4506a46a961991189e3563
Product text
CDUS41 KLWX 040624
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
224 AM EDT FRI SEP 04 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 3 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 92 4:33 PM 99 2023 84 8 83
MINIMUM 70 4:51 AM 45 1967 62 8 51
AVERAGE 81 73 8 67
PRECIPITATION (IN)
YESTERDAY 0.62 1.47 1969 0.13 0.49 0.00
MONTH TO DATE 0.62 0.37 0.25 0.00
SINCE SEP 1 0.62 0.37 0.25 0.00
SINCE JAN 1 30.02 29.59 0.43 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 2
MONTH TO DATE 53 24 29 3
SINCE SEP 1 53 24 29 3
SINCE JAN 1 1333 1080 253 1151
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 32 HIGHEST WIND DIRECTION NW (330)
HIGHEST GUST SPEED 49 HIGHEST GUST DIRECTION NW (320)
AVERAGE WIND SPEED 5.8
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
THUNDERSTORM
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 4:00 AM
LOWEST 52 4:00 PM
AVERAGE 75
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 83 99 2023
MINIMUM TEMPERATURE (F) 62 48 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.
$$Product id iem:CDUS41-KLWX-032123:IAD:2026-09-03:interim · iem-afos · IEM archive
SHA-256 36d6fd57071373baabcb15449c15c128f9baa48c07120ba645b4ba97f2f3e5d7
Product text
CDUS41 KLWX 032123
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
523 PM EDT THU SEP 03 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 3 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 92 3:59 PM 99 2023 84 8 83
MINIMUM 70 4:51 AM 45 1967 62 8 51
AVERAGE 81 73 8 67
PRECIPITATION (IN)
TODAY 0.00 1.47 1969 0.13 -0.13 0.00
MONTH TO DATE T 0.37 -0.37 0.00
SINCE SEP 1 T 0.37 -0.37 0.00
SINCE JAN 1 29.40 29.59 -0.19 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 2
MONTH TO DATE 53 24 29 3
SINCE SEP 1 53 24 29 3
SINCE JAN 1 1333 1080 253 1151
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NE (30)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION SW (240)
AVERAGE WIND SPEED 5.6
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 4:00 AM
LOWEST 52 4:00 PM
AVERAGE 75
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 83 99 2023
MINIMUM TEMPERATURE (F) 62 48 1997
SUNRISE AND SUNSET
SEPTEMBER 3 2026.....SUNRISE 6:41 AM EDT SUNSET 7:37 PM EDT
SEPTEMBER 4 2026.....SUNRISE 6:41 AM EDT SUNSET 7:35 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/2026-09-03 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.