NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-10-08 · 2026-10-10 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-10 02:20:00 EDT · Product id iem:CDUS41-KLWX-100620:IAD:2026-10-09:final · IEM archive
Product id iem:CDUS41-KLWX-100620:IAD:2026-10-09:final · iem-afos · IEM archive
SHA-256 2af7f0beec6c326b39ea100915151ea9a5c068f628c449170fe01eb373c9041b
Product text
CDUS41 KLWX 100620
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
220 AM EDT SAT OCT 10 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 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 76 1:16 PM 94 2007 70 6 65
MINIMUM 45 6:40 AM 26 2001 48 -3 46
AVERAGE 61 59 2 56
PRECIPITATION (IN)
YESTERDAY 0.00 2.53 1976 0.12 -0.12 0.00
MONTH TO DATE 0.40 1.13 -0.73 0.16
SINCE SEP 1 4.20 5.07 -0.87 1.38
SINCE JAN 1 33.60 34.29 -0.69 26.02
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 7 -3 9
MONTH TO DATE 26 51 -25 26
SINCE SEP 1 47 96 -49 33
SINCE JUL 1 47 97 -50 35
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 19 14 5 12
SINCE SEP 1 243 166 77 182
SINCE JAN 1 1523 1222 301 1330
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NW (330)
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION W (290)
AVERAGE WIND SPEED 2.3
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 6:00 AM
LOWEST 26 1:00 PM
AVERAGE 60
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 70 87 2017
MINIMUM TEMPERATURE (F) 48 31 1972
1978
SUNRISE AND SUNSET
OCTOBER 10 2026.......SUNRISE 7:14 AM EDT SUNSET 6:38 PM EDT
OCTOBER 11 2026.......SUNRISE 7:15 AM EDT SUNSET 6:37 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-092130:IAD:2026-10-09:interim · iem-afos · IEM archive
SHA-256 f41514bcdf47ceafac3ec320caf5b82ee722b602c4df50ca076ea2f044cfbefd
Product text
CDUS41 KLWX 092130
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
530 PM EDT FRI OCT 09 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 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 76 1:16 PM 94 2007 70 6 65
MINIMUM 45 6:40 AM 26 2001 48 -3 46
AVERAGE 61 59 2 56
PRECIPITATION (IN)
TODAY 0.00 2.53 1976 0.12 -0.12 0.00
MONTH TO DATE 0.40 1.13 -0.73 0.16
SINCE SEP 1 4.20 5.07 -0.87 1.38
SINCE JAN 1 33.60 34.29 -0.69 26.02
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 4 7 -3 9
MONTH TO DATE 26 51 -25 26
SINCE SEP 1 47 96 -49 33
SINCE JUL 1 47 97 -50 35
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 19 14 5 12
SINCE SEP 1 243 166 77 182
SINCE JAN 1 1523 1222 301 1330
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NW (330)
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION W (290)
AVERAGE WIND SPEED 2.7
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 6:00 AM
LOWEST 26 1:00 PM
AVERAGE 60
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 70 87 2017
MINIMUM TEMPERATURE (F) 48 31 1972
1978
SUNRISE AND SUNSET
OCTOBER 9 2026.......SUNRISE 7:13 AM EDT SUNSET 6:40 PM EDT
OCTOBER 10 2026.......SUNRISE 7:14 AM EDT SUNSET 6:38 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/2026-10-09 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.