NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-22 · 2026-09-24 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-24 02:33:00 EDT · Product id iem:CDUS41-KLWX-240633:IAD:2026-09-23:final · IEM archive
Product id iem:CDUS41-KLWX-240633:IAD:2026-09-23:final · iem-afos · IEM archive
SHA-256 dc1cd12f2a281039bc31ae5561b0a942f92f5771e88969754d8bfa04fe852ff5
Product text
CDUS41 KLWX 240633
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
233 AM EDT THU SEP 24 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 23 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 63 5:58 PM 94 2019 77 -14 85
MINIMUM 54 11:07 PM 33 1983 55 -1 64
AVERAGE 59 66 -7 75
PRECIPITATION (IN)
YESTERDAY 0.26 1.74 2003 0.12 0.14 0.01
MONTH TO DATE 3.61 2.98 0.63 1.06
SINCE SEP 1 3.61 2.98 0.63 1.06
SINCE JAN 1 33.01 32.20 0.81 25.70
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 6 2 4 0
MONTH TO DATE 10 20 -10 7
SINCE SEP 1 10 20 -10 7
SINCE JUL 1 10 21 -11 9
COOLING
YESTERDAY 0 3 -3 10
MONTH TO DATE 191 134 57 118
SINCE SEP 1 191 134 57 118
SINCE JAN 1 1471 1190 281 1266
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NE (50)
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION NE (40)
AVERAGE WIND SPEED 9.3
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
FOG
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 12:00 AM
LOWEST 70 5:00 PM
AVERAGE 82
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 76 97 2010
MINIMUM TEMPERATURE (F) 55 30 1974
SUNRISE AND SUNSET
SEPTEMBER 24 2026.....SUNRISE 6:59 AM EDT SUNSET 7:03 PM EDT
SEPTEMBER 25 2026.....SUNRISE 7:00 AM EDT SUNSET 7:02 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-232121:IAD:2026-09-23:interim · iem-afos · IEM archive
SHA-256 ba71be159d06998ea67d961435598a8973350d7e679e590ae93d53731b0be655
Product text
CDUS41 KLWX 232121
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
521 PM EDT WED SEP 23 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 23 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 63 3:59 PM 94 2019 77 -14 85
MINIMUM 54 11:30 AM 33 1983 55 -1 64
AVERAGE 59 66 -7 75
PRECIPITATION (IN)
TODAY 0.26 1.74 2003 0.12 0.14 0.01
MONTH TO DATE 3.61 2.98 0.63 1.06
SINCE SEP 1 3.61 2.98 0.63 1.06
SINCE JAN 1 33.01 32.20 0.81 25.70
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 6 2 4 0
MONTH TO DATE 10 20 -10 7
SINCE SEP 1 10 20 -10 7
SINCE JUL 1 10 21 -11 9
COOLING
TODAY 0 3 -3 10
MONTH TO DATE 191 134 57 118
SINCE SEP 1 191 134 57 118
SINCE JAN 1 1471 1190 281 1266
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NE (50)
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION NE (40)
AVERAGE WIND SPEED 10.1
SKY COVER
AVERAGE SKY COVER 1.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
FOG
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 12:00 AM
LOWEST 72 3:00 PM
AVERAGE 83
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 76 97 2010
MINIMUM TEMPERATURE (F) 55 30 1974
SUNRISE AND SUNSET
SEPTEMBER 23 2026.....SUNRISE 6:58 AM EDT SUNSET 7:05 PM EDT
SEPTEMBER 24 2026.....SUNRISE 6:59 AM EDT SUNSET 7:03 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/2026-09-23 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.