NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-01 · 2026-09-03 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-03 02:25:00 EDT · Product id iem:CDUS41-KLWX-030625:IAD:2026-09-02:final · IEM archive
Product id iem:CDUS41-KLWX-030625:IAD:2026-09-02:final · iem-afos · IEM archive
SHA-256 4d4042a9057a0174531986d4965f3e5a4d022893331afcc2894ddeff813c1a21
Product text
CDUS41 KLWX 030625
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
225 AM EDT THU SEP 03 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 2 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 12:29 PM 99 1980 84 8 79
MINIMUM 73 11:59 PM 44 1970 63 10 51
AVERAGE 83 73 10 65
PRECIPITATION (IN)
YESTERDAY T 0.97 1969 0.12 -0.12 0.00
MONTH TO DATE T 0.24 -0.24 0.00
SINCE SEP 1 T 0.24 -0.24 0.00
SINCE JAN 1 29.40 29.46 -0.06 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 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 18 8 10 0
MONTH TO DATE 37 16 21 1
SINCE SEP 1 37 16 21 1
SINCE JAN 1 1317 1072 245 1149
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 25 HIGHEST WIND DIRECTION NE (50)
HIGHEST GUST SPEED 33 HIGHEST GUST DIRECTION NE (40)
AVERAGE WIND SPEED 3.2
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
THUNDERSTORM
LIGHT RAIN
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 94 11:00 PM
LOWEST 54 12:00 PM
AVERAGE 74
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 84 99 2023
MINIMUM TEMPERATURE (F) 62 45 1967
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.
$$Product id iem:CDUS41-KLWX-022130:IAD:2026-09-02:interim · iem-afos · IEM archive
SHA-256 c6c12444baa99c58eeaed940e1b0842ca61743123567b752308e6c3443cf5d6f
Product text
CDUS41 KLWX 022130
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
530 PM EDT WED SEP 02 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 2 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 12:29 PM 99 1980 84 8 79
MINIMUM 74 6:36 AM 44 1970 63 11 51
AVERAGE 83 73 10 65
PRECIPITATION (IN)
TODAY T 0.97 1969 0.12 -0.12 0.00
MONTH TO DATE T 0.24 -0.24 0.00
SINCE SEP 1 T 0.24 -0.24 0.00
SINCE JAN 1 29.40 29.46 -0.06 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 18 8 10 0
MONTH TO DATE 37 16 21 1
SINCE SEP 1 37 16 21 1
SINCE JAN 1 1317 1072 245 1149
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 25 HIGHEST WIND DIRECTION NE (50)
HIGHEST GUST SPEED 33 HIGHEST GUST DIRECTION NE (40)
AVERAGE WIND SPEED 3.1
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
THUNDERSTORM
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 88 4:00 PM
LOWEST 54 12:00 PM
AVERAGE 71
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 84 99 2023
MINIMUM TEMPERATURE (F) 62 45 1967
SUNRISE AND SUNSET
SEPTEMBER 2 2026.....SUNRISE 6:40 AM EDT SUNSET 7:39 PM EDT
SEPTEMBER 3 2026.....SUNRISE 6:41 AM EDT SUNSET 7:37 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/2026-09-02 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.