NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-30 · 2026-10-02 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-02 02:27:00 EDT · Product id iem:CDUS41-KLWX-020627:IAD:2026-10-01:final · IEM archive
Product id iem:CDUS41-KLWX-020627:IAD:2026-10-01:final · iem-afos · IEM archive
SHA-256 24e7c2fa4e0c333f4e049ad19cbe3b770de056b7a63abd646d1fd4d02a385400
Product text
CDUS41 KLWX 020627
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
227 AM EDT FRI OCT 02 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 1 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 86 2:28 PM 90 1986 73 13 76
MINIMUM 61 5:46 AM 31 1993 52 9 48
AVERAGE 74 62 12 62
PRECIPITATION (IN)
YESTERDAY 0.00 4.06 1979 0.13 -0.13 0.00
MONTH TO DATE 0.00 0.13 -0.13 0.00
SINCE SEP 1 3.80 4.07 -0.27 1.22
SINCE JAN 1 33.20 33.29 -0.09 25.86
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 4 -4 3
MONTH TO DATE 0 4 -4 3
SINCE SEP 1 21 49 -28 10
SINCE JUL 1 21 50 -29 12
COOLING
YESTERDAY 9 2 7 0
MONTH TO DATE 9 2 7 0
SINCE SEP 1 207 154 53 170
SINCE JAN 1 1487 1210 277 1318
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION S (200)
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION S (190)
AVERAGE WIND SPEED 4.7
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 5:00 AM
LOWEST 42 2:00 PM
AVERAGE 70
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 96 2019
MINIMUM TEMPERATURE (F) 51 32 1997
1998
SUNRISE AND SUNSET
OCTOBER 2 2026.......SUNRISE 7:07 AM EDT SUNSET 6:51 PM EDT
OCTOBER 3 2026.......SUNRISE 7:08 AM EDT SUNSET 6:49 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-012122:IAD:2026-10-01:interim · iem-afos · IEM archive
SHA-256 531f47cdd90563266f232a6cd0c9ee57f633848bdbb387b49e17c37e490fb06f
Product text
CDUS41 KLWX 012122
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
522 PM EDT THU OCT 01 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 1 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 86 2:28 PM 90 1986 73 13 76
MINIMUM 61 5:46 AM 31 1993 52 9 48
AVERAGE 74 62 12 62
PRECIPITATION (IN)
TODAY 0.00 4.06 1979 0.13 -0.13 0.00
MONTH TO DATE 0.00 0.13 -0.13 0.00
SINCE SEP 1 3.80 4.07 -0.27 1.22
SINCE JAN 1 33.20 33.29 -0.09 25.86
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 4 -4 3
MONTH TO DATE 0 4 -4 3
SINCE SEP 1 21 49 -28 10
SINCE JUL 1 21 50 -29 12
COOLING
TODAY 9 2 7 0
MONTH TO DATE 9 2 7 0
SINCE SEP 1 207 154 53 170
SINCE JAN 1 1487 1210 277 1318
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION S (200)
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION SW (220)
AVERAGE WIND SPEED 3.9
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 5:00 AM
LOWEST 42 2:00 PM
AVERAGE 70
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 96 2019
MINIMUM TEMPERATURE (F) 51 32 1997
1998
SUNRISE AND SUNSET
OCTOBER 1 2026.......SUNRISE 7:06 AM EDT SUNSET 6:52 PM EDT
OCTOBER 2 2026.......SUNRISE 7:07 AM EDT SUNSET 6:51 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/2026-10-01 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.