NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-29 · 2026-10-01 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-01 02:33:00 EDT · Product id iem:CDUS41-KLWX-010633:IAD:2026-09-30:final · IEM archive
Product id iem:CDUS41-KLWX-010633:IAD:2026-09-30:final · iem-afos · IEM archive
SHA-256 b274d9fe2ea3dbf8a5f1f78f6f7dc788cea4f5b84fb7e113a1d2e72c4ed46e99
Product text
CDUS41 KLWX 010633
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
233 AM EDT THU OCT 01 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 30 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 2:26 PM 92 1986 74 7 75
MINIMUM 56 6:37 AM 35 1993 52 4 66
AVERAGE 69 63 6 71
PRECIPITATION (IN)
YESTERDAY 0.00 4.74 2010 0.15 -0.15 T
MONTH TO DATE 3.80 3.94 -0.14 1.22
SINCE SEP 1 3.80 3.94 -0.14 1.22
SINCE JAN 1 33.20 33.16 0.04 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 0
MONTH TO DATE 21 43 -22 7
SINCE SEP 1 21 43 -22 7
SINCE JUL 1 21 44 -23 9
COOLING
YESTERDAY 4 2 2 6
MONTH TO DATE 198 152 46 170
SINCE SEP 1 198 152 46 170
SINCE JAN 1 1478 1208 270 1318
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION S (190)
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION SW (210)
AVERAGE WIND SPEED 3.6
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 3:00 AM
LOWEST 52 2:00 PM
AVERAGE 76
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 90 1986
MINIMUM TEMPERATURE (F) 52 31 1993
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.
$$Product id iem:CDUS41-KLWX-302126:IAD:2026-09-30:interim · iem-afos · IEM archive
SHA-256 0b5b6b1636ca06bdcb594f4eb2d83296ce1b1926253e65946b1e311878a95928
Product text
CDUS41 KLWX 302126
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
526 PM EDT WED SEP 30 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 30 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 2:26 PM 92 1986 74 7 75
MINIMUM 56 6:37 AM 35 1993 52 4 66
AVERAGE 69 63 6 71
PRECIPITATION (IN)
TODAY 0.00 4.74 2010 0.15 -0.15 T
MONTH TO DATE 3.80 3.94 -0.14 1.22
SINCE SEP 1 3.80 3.94 -0.14 1.22
SINCE JAN 1 33.20 33.16 0.04 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 0
MONTH TO DATE 21 43 -22 7
SINCE SEP 1 21 43 -22 7
SINCE JUL 1 21 44 -23 9
COOLING
TODAY 4 2 2 6
MONTH TO DATE 198 152 46 170
SINCE SEP 1 198 152 46 170
SINCE JAN 1 1478 1208 270 1318
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION S (190)
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION SW (210)
AVERAGE WIND SPEED 2.8
SKY COVER
AVERAGE SKY COVER 0.4
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 3:00 AM
LOWEST 52 2:00 PM
AVERAGE 76
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 90 1986
MINIMUM TEMPERATURE (F) 52 31 1993
SUNRISE AND SUNSET
SEPTEMBER 30 2026.....SUNRISE 7:05 AM EDT SUNSET 6:54 PM EDT
OCTOBER 1 2026.......SUNRISE 7:06 AM EDT SUNSET 6:52 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/2026-09-30 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.