NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-10-09 · 2026-10-11 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-11 02:21:00 EDT · Product id iem:CDUS41-KLWX-110621:IAD:2026-10-10:final · IEM archive
Product id iem:CDUS41-KLWX-110621:IAD:2026-10-10:final · iem-afos · IEM archive
SHA-256 b7b750c89502e33d982a5c82e047babc85662f3764be127a7e5e801d9d8a543b
Product text
CDUS41 KLWX 110621
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
221 AM EDT SUN OCT 11 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 10 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 70 2:17 PM 87 2017 70 0 67
MINIMUM 49 4:24 AM 31 1972 48 1 38
1978
AVERAGE 60 59 1 53
PRECIPITATION (IN)
YESTERDAY T 2.22 2013 0.11 -0.11 0.00
MONTH TO DATE 0.40 1.24 -0.84 0.16
SINCE SEP 1 4.20 5.18 -0.98 1.38
SINCE JAN 1 33.60 34.40 -0.80 26.02
SNOWFALL (IN)
YESTERDAY 0.0 1.3 1979 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 5 7 -2 12
MONTH TO DATE 31 58 -27 38
SINCE SEP 1 52 103 -51 45
SINCE JUL 1 52 104 -52 47
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 19 15 4 12
SINCE SEP 1 243 167 76 182
SINCE JAN 1 1523 1223 300 1330
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION E (80)
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION E (90)
AVERAGE WIND SPEED 5.4
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 3:00 AM
LOWEST 47 2:00 PM
AVERAGE 70
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 70 86 2010
MINIMUM TEMPERATURE (F) 47 28 1972
SUNRISE AND SUNSET
OCTOBER 11 2026.......SUNRISE 7:15 AM EDT SUNSET 6:37 PM EDT
OCTOBER 12 2026.......SUNRISE 7:16 AM EDT SUNSET 6:36 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-102129:IAD:2026-10-10:interim · iem-afos · IEM archive
SHA-256 762274f8b47e32760025a20277edfc1ae64c813975c9fade0482d69f9e5d9b72
Product text
CDUS41 KLWX 102129
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
529 PM EDT SAT OCT 10 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 10 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 70 2:17 PM 87 2017 70 0 67
MINIMUM 49 4:24 AM 31 1972 48 1 38
1978
AVERAGE 60 59 1 53
PRECIPITATION (IN)
TODAY 0.00 2.22 2013 0.11 -0.11 0.00
MONTH TO DATE 0.40 1.24 -0.84 0.16
SINCE SEP 1 4.20 5.18 -0.98 1.38
SINCE JAN 1 33.60 34.40 -0.80 26.02
SNOWFALL (IN)
TODAY 0.0 1.3 1979 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 5 7 -2 12
MONTH TO DATE 31 58 -27 38
SINCE SEP 1 52 103 -51 45
SINCE JUL 1 52 104 -52 47
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 19 15 4 12
SINCE SEP 1 243 167 76 182
SINCE JAN 1 1523 1223 300 1330
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION E (100)
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION E (110)
AVERAGE WIND SPEED 3.5
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 3:00 AM
LOWEST 47 2:00 PM
AVERAGE 70
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 70 86 2010
MINIMUM TEMPERATURE (F) 47 28 1972
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.
$$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/2026-10-10 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.