NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-21 · 2026-09-23 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-23 02:24:00 EDT · Product id iem:CDUS41-KLWX-230624:IAD:2026-09-22:final · IEM archive
Product id iem:CDUS41-KLWX-230624:IAD:2026-09-22:final · iem-afos · IEM archive
SHA-256 11c5153a4645736b649cfdcfb23e85b4126e9a1499a9d3d5e4a26fd7afcb946b
Product text
CDUS41 KLWX 230624
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
224 AM EDT WED SEP 23 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 22 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 64 2:38 AM 94 1970 77 -13 79
1980
2010
MINIMUM 58 11:59 PM 35 1962 56 2 64
AVERAGE 61 66 -5 72
PRECIPITATION (IN)
YESTERDAY 1.15 1.57 1982 0.12 1.03 0.00
MONTH TO DATE 3.35 2.86 0.49 1.05
SINCE SEP 1 3.35 2.86 0.49 1.05
SINCE JAN 1 32.75 32.08 0.67 25.69
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 4 2 2 0
MONTH TO DATE 4 18 -14 7
SINCE SEP 1 4 18 -14 7
SINCE JUL 1 4 19 -15 9
COOLING
YESTERDAY 0 3 -3 7
MONTH TO DATE 191 131 60 108
SINCE SEP 1 191 131 60 108
SINCE JAN 1 1471 1187 284 1256
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION NE (40)
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION NE (60)
AVERAGE WIND SPEED 9.5
SKY COVER
AVERAGE SKY COVER 1.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
THUNDERSTORM
HEAVY RAIN
RAIN
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 3:00 AM
LOWEST 90 9:00 AM
AVERAGE 94
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 77 94 2019
MINIMUM TEMPERATURE (F) 55 33 1983
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.
$$Product id iem:CDUS41-KLWX-222123:IAD:2026-09-22:interim · iem-afos · IEM archive
SHA-256 1edad7a051737f24a91b417c1d138d5906276e59a5c13fc7314ce37f7cee5cf0
Product text
CDUS41 KLWX 222123
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
523 PM EDT TUE SEP 22 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 22 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 64 2:38 AM 94 1970 77 -13 79
1980
2010
MINIMUM 59 1:45 PM 35 1962 56 3 64
AVERAGE 62 66 -4 72
PRECIPITATION (IN)
TODAY 0.86 1.57 1982 0.12 0.74 0.00
MONTH TO DATE 3.06 2.86 0.20 1.05
SINCE SEP 1 3.06 2.86 0.20 1.05
SINCE JAN 1 32.46 32.08 0.38 25.69
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 3 2 1 0
MONTH TO DATE 3 18 -15 7
SINCE SEP 1 3 18 -15 7
SINCE JUL 1 3 19 -16 9
COOLING
TODAY 0 3 -3 7
MONTH TO DATE 191 131 60 108
SINCE SEP 1 191 131 60 108
SINCE JAN 1 1471 1187 284 1256
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION NE (40)
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION NE (60)
AVERAGE WIND SPEED 9.1
SKY COVER
AVERAGE SKY COVER 1.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
THUNDERSTORM
HEAVY RAIN
RAIN
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 3:00 AM
LOWEST 90 9:00 AM
AVERAGE 94
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 77 94 2019
MINIMUM TEMPERATURE (F) 55 33 1983
SUNRISE AND SUNSET
SEPTEMBER 22 2026.....SUNRISE 6:58 AM EDT SUNSET 7:07 PM EDT
SEPTEMBER 23 2026.....SUNRISE 6:58 AM EDT SUNSET 7:05 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/2026-09-22 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.