NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-25 · 2026-09-27 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-27 02:33:00 EDT · Product id iem:CDUS41-KLWX-270633:IAD:2026-09-26:final · IEM archive
Product id iem:CDUS41-KLWX-270633:IAD:2026-09-26:final · iem-afos · IEM archive
SHA-256 016c98e28af7d36b8c7b0e138228f41a8e4bd9e758faf82f909a67b4af8b182e
Product text
CDUS41 KLWX 270633
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
233 AM EDT SUN SEP 27 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 26 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 11:55 AM 93 2007 75 -5 84
MINIMUM 57 7:02 PM 38 1964 54 3 64
1983
AVERAGE 64 65 -1 74
PRECIPITATION (IN)
YESTERDAY 0.16 2.15 1975 0.13 0.03 0.00
MONTH TO DATE 3.77 3.37 0.40 1.22
SINCE SEP 1 3.77 3.37 0.40 1.22
SINCE JAN 1 33.17 32.59 0.58 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 1 3 -2 0
MONTH TO DATE 20 28 -8 7
SINCE SEP 1 20 28 -8 7
SINCE JUL 1 20 29 -9 9
COOLING
YESTERDAY 0 3 -3 9
MONTH TO DATE 191 143 48 144
SINCE SEP 1 191 143 48 144
SINCE JAN 1 1471 1199 272 1292
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION N (350)
HIGHEST GUST SPEED 37 HIGHEST GUST DIRECTION N (350)
AVERAGE WIND SPEED 12.5
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
RAIN
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 7:00 PM
LOWEST 42 12:00 PM
AVERAGE 68
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 75 96 1998
MINIMUM TEMPERATURE (F) 53 35 1984
SUNRISE AND SUNSET
SEPTEMBER 27 2026.....SUNRISE 7:02 AM EDT SUNSET 6:59 PM EDT
SEPTEMBER 28 2026.....SUNRISE 7:03 AM EDT SUNSET 6:57 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-262125:IAD:2026-09-26:interim · iem-afos · IEM archive
SHA-256 95d62bdf685302aeff75346761772cad9a39f3ab89b7cb4f6d7cbc62f903a2ba
Product text
CDUS41 KLWX 262125
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
525 PM EDT SAT SEP 26 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 26 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 11:55 AM 93 2007 75 -5 84
MINIMUM 57 6:35 AM 38 1964 54 3 64
1983
AVERAGE 64 65 -1 74
PRECIPITATION (IN)
TODAY 0.03 2.15 1975 0.13 -0.10 0.00
MONTH TO DATE 3.64 3.37 0.27 1.22
SINCE SEP 1 3.64 3.37 0.27 1.22
SINCE JAN 1 33.04 32.59 0.45 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 1 3 -2 0
MONTH TO DATE 20 28 -8 7
SINCE SEP 1 20 28 -8 7
SINCE JUL 1 20 29 -9 9
COOLING
TODAY 0 3 -3 9
MONTH TO DATE 191 143 48 144
SINCE SEP 1 191 143 48 144
SINCE JAN 1 1471 1199 272 1292
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION N (350)
HIGHEST GUST SPEED 37 HIGHEST GUST DIRECTION N (350)
AVERAGE WIND SPEED 13.6
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
RAIN
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 83 4:00 PM
LOWEST 42 12:00 PM
AVERAGE 63
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 75 96 1998
MINIMUM TEMPERATURE (F) 53 35 1984
SUNRISE AND SUNSET
SEPTEMBER 26 2026.....SUNRISE 7:01 AM EDT SUNSET 7:00 PM EDT
SEPTEMBER 27 2026.....SUNRISE 7:02 AM EDT SUNSET 6:59 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/2026-09-26 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.