NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-20 · 2026-09-22 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-22 02:24:00 EDT · Product id iem:CDUS41-KLWX-220624:IAD:2026-09-21:final · IEM archive
Product id iem:CDUS41-KLWX-220624:IAD:2026-09-21:final · iem-afos · IEM archive
SHA-256 8bdc18a68250cb63506dae24019df14bf397dd16606f5e9601e6241b54c97b0d
Product text
CDUS41 KLWX 220624
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
224 AM EDT TUE SEP 22 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 21 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 73 10:49 AM 92 1965 77 -4 74
1998
MINIMUM 64 11:59 PM 33 1962 56 8 66
AVERAGE 69 67 2 70
PRECIPITATION (IN)
YESTERDAY 0.57 2.59 1979 0.13 0.44 0.00
MONTH TO DATE 2.20 2.74 -0.54 1.05
SINCE SEP 1 2.20 2.74 -0.54 1.05
SINCE JAN 1 31.60 31.96 -0.36 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 0 2 -2 0
MONTH TO DATE 0 16 -16 7
SINCE SEP 1 0 16 -16 7
SINCE JUL 1 0 17 -17 9
COOLING
YESTERDAY 4 4 0 5
MONTH TO DATE 191 128 63 101
SINCE SEP 1 191 128 63 101
SINCE JAN 1 1471 1184 287 1249
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NE (30)
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION NE (30)
AVERAGE WIND SPEED 7.5
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
THUNDERSTORM
RAIN
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 10:00 PM
LOWEST 68 11:00 AM
AVERAGE 83
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 77 94 1970
1980
2010
MINIMUM TEMPERATURE (F) 56 35 1962
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.
$$Product id iem:CDUS41-KLWX-212132:IAD:2026-09-21:interim · iem-afos · IEM archive
SHA-256 b50a98388a743fdf5955ce11f05f3829b76d3dd7b1dbf34e0c02ec525b5d88ee
Product text
CDUS41 KLWX 212132
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
532 PM EDT MON SEP 21 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 21 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 73 10:49 AM 92 1965 77 -4 74
1998
MINIMUM 64 3:59 PM 33 1962 56 8 66
AVERAGE 69 67 2 70
PRECIPITATION (IN)
TODAY 0.49 2.59 1979 0.13 0.36 0.00
MONTH TO DATE 2.12 2.74 -0.62 1.05
SINCE SEP 1 2.12 2.74 -0.62 1.05
SINCE JAN 1 31.52 31.96 -0.44 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 0 2 -2 0
MONTH TO DATE 0 16 -16 7
SINCE SEP 1 0 16 -16 7
SINCE JUL 1 0 17 -17 9
COOLING
TODAY 4 4 0 5
MONTH TO DATE 191 128 63 101
SINCE SEP 1 191 128 63 101
SINCE JAN 1 1471 1184 287 1249
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NE (30)
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION NE (30)
AVERAGE WIND SPEED 8.2
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
THUNDERSTORM
RAIN
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 96 4:00 PM
LOWEST 68 11:00 AM
AVERAGE 82
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 77 94 1970
1980
2010
MINIMUM TEMPERATURE (F) 56 35 1962
SUNRISE AND SUNSET
SEPTEMBER 21 2026.....SUNRISE 6:57 AM EDT SUNSET 7:08 PM EDT
SEPTEMBER 22 2026.....SUNRISE 6:58 AM EDT SUNSET 7:07 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/2026-09-21 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.