NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-08 · 2026-09-10 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-10 02:35:00 EDT · Product id iem:CDUS41-KLWX-100635:IAD:2026-09-09:final · IEM archive
Product id iem:CDUS41-KLWX-100635:IAD:2026-09-09:final · iem-afos · IEM archive
SHA-256 250129f294542c6217cae5b874e8d80e58b6b7e76d6c00102256aade48726dd4
Product text
CDUS41 KLWX 100635
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
235 AM EDT THU SEP 10 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 9 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 89 3:30 PM 98 2016 82 7 78
MINIMUM 66 6:04 AM 40 1986 61 5 46
AVERAGE 78 71 7 62
PRECIPITATION (IN)
YESTERDAY 0.00 1.40 2018 0.13 -0.13 0.00
MONTH TO DATE 0.83 1.10 -0.27 0.03
SINCE SEP 1 0.83 1.10 -0.27 0.03
SINCE JAN 1 30.23 30.32 -0.09 24.67
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 3
MONTH TO DATE 0 0 0 6
SINCE SEP 1 0 0 0 6
SINCE JUL 1 0 1 -1 8
COOLING
YESTERDAY 13 7 6 0
MONTH TO DATE 111 68 43 38
SINCE SEP 1 111 68 43 38
SINCE JAN 1 1391 1124 267 1186
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION S (200)
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION S (170)
AVERAGE WIND SPEED 9.8
SKY COVER
AVERAGE SKY COVER 0.3
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 84 3:00 AM
LOWEST 47 4:00 PM
AVERAGE 66
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 82 99 1983
MINIMUM TEMPERATURE (F) 60 43 1981
SUNRISE AND SUNSET
SEPTEMBER 10 2026.....SUNRISE 6:47 AM EDT SUNSET 7:26 PM EDT
SEPTEMBER 11 2026.....SUNRISE 6:48 AM EDT SUNSET 7:24 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-092124:IAD:2026-09-09:interim · iem-afos · IEM archive
SHA-256 5be09f85490a04852dd561920317f4dce8251bbd4b7b317a93497e217ff56350
Product text
CDUS41 KLWX 092124
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
524 PM EDT WED SEP 09 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 9 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 89 3:30 PM 98 2016 82 7 78
MINIMUM 66 6:04 AM 40 1986 61 5 46
AVERAGE 78 71 7 62
PRECIPITATION (IN)
TODAY 0.00 1.40 2018 0.13 -0.13 0.00
MONTH TO DATE 0.83 1.10 -0.27 0.03
SINCE SEP 1 0.83 1.10 -0.27 0.03
SINCE JAN 1 30.23 30.32 -0.09 24.67
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 3
MONTH TO DATE 0 0 0 6
SINCE SEP 1 0 0 0 6
SINCE JUL 1 0 1 -1 8
COOLING
TODAY 13 7 6 0
MONTH TO DATE 111 68 43 38
SINCE SEP 1 111 68 43 38
SINCE JAN 1 1391 1124 267 1186
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION S (200)
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION S (170)
AVERAGE WIND SPEED 9.0
SKY COVER
AVERAGE SKY COVER 0.3
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 84 3:00 AM
LOWEST 47 4:00 PM
AVERAGE 66
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 82 99 1983
MINIMUM TEMPERATURE (F) 60 43 1981
SUNRISE AND SUNSET
SEPTEMBER 9 2026.....SUNRISE 6:46 AM EDT SUNSET 7:28 PM EDT
SEPTEMBER 10 2026.....SUNRISE 6:47 AM EDT SUNSET 7:26 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/2026-09-09 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.