NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-04 · 2026-09-06 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-06 02:26:00 EDT · Product id iem:CDUS41-KLWX-060626:IAD:2026-09-05:final · IEM archive
Product id iem:CDUS41-KLWX-060626:IAD:2026-09-05:final · iem-afos · IEM archive
SHA-256 80bfd06dd24c36864a36e7b218c85e1cba12ba15189ae1276c3bf55a1de46acd
Product text
CDUS41 KLWX 060626
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
226 AM EDT SUN SEP 06 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 5 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 81 3:17 PM 99 2023 83 -2 90
MINIMUM 68 3:51 AM 42 1997 62 6 61
AVERAGE 75 72 3 76
PRECIPITATION (IN)
YESTERDAY T 3.78 1979 0.12 -0.12 0.00
MONTH TO DATE 0.83 0.61 0.22 T
SINCE SEP 1 0.83 0.61 0.22 T
SINCE JAN 1 30.23 29.83 0.40 24.64
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 MM
DEGREE DAYS
HEATING
YESTERDAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE SEP 1 0 0 0 0
SINCE JUL 1 0 1 -1 2
COOLING
YESTERDAY 10 8 2 11
MONTH TO DATE 79 40 39 24
SINCE SEP 1 79 40 39 24
SINCE JAN 1 1359 1096 263 1172
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION NE (30)
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 4.2
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 12:00 AM
LOWEST 66 9:00 PM
AVERAGE 82
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 83 100 2023
MINIMUM TEMPERATURE (F) 61 45 1972
1976
SUNRISE AND SUNSET
SEPTEMBER 6 2026.....SUNRISE 6:43 AM EDT SUNSET 7:32 PM EDT
SEPTEMBER 7 2026.....SUNRISE 6:44 AM EDT SUNSET 7:31 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-052123:IAD:2026-09-05:interim · iem-afos · IEM archive
SHA-256 038b7ecc34a8729db77bf60f32e150c08482a1ee55f3b2eb39d6cd199f4fad93
Product text
CDUS41 KLWX 052123
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
523 PM EDT SAT SEP 05 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 5 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 81 3:17 PM 99 2023 83 -2 90
MINIMUM 68 3:51 AM 42 1997 62 6 61
AVERAGE 75 72 3 76
PRECIPITATION (IN)
TODAY T 3.78 1979 0.12 -0.12 0.00
MONTH TO DATE 0.83 0.61 0.22 T
SINCE SEP 1 0.83 0.61 0.22 T
SINCE JAN 1 30.23 29.83 0.40 24.64
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 0
MONTH TO DATE 0 0 0 0
SINCE SEP 1 0 0 0 0
SINCE JUL 1 0 1 -1 2
COOLING
TODAY 10 8 2 11
MONTH TO DATE 79 40 39 24
SINCE SEP 1 79 40 39 24
SINCE JAN 1 1359 1096 263 1172
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION NE (30)
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 4.1
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 12:00 AM
LOWEST 67 4:00 PM
AVERAGE 82
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 83 100 2023
MINIMUM TEMPERATURE (F) 61 45 1972
1976
SUNRISE AND SUNSET
SEPTEMBER 5 2026.....SUNRISE 6:42 AM EDT SUNSET 7:34 PM EDT
SEPTEMBER 6 2026.....SUNRISE 6:43 AM EDT SUNSET 7:32 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/2026-09-05 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.