NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-10-26 · 2026-10-28 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-28 02:22:00 EDT · Product id iem:CDUS41-KLWX-280622:IAD:2026-10-27:final · IEM archive
Product id iem:CDUS41-KLWX-280622:IAD:2026-10-27:final · iem-afos · IEM archive
SHA-256 0e0ada7cd4ae7905f58acc28593a7e318e6676dbb2128d5c24515656f24cc2e3
Product text
CDUS41 KLWX 280622
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
222 AM EDT WED OCT 28 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 27 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 72 3:52 PM 84 1963 64 8 62
MINIMUM 44 5:48 AM 21 1988 41 3 35
AVERAGE 58 52 6 49
PRECIPITATION (IN)
YESTERDAY 0.00 1.89 2003 0.10 -0.10 0.00
MONTH TO DATE 3.61 3.20 0.41 0.97
SINCE SEP 1 7.41 7.14 0.27 2.19
SINCE JAN 1 36.81 36.36 0.45 26.83
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 7 13 -6 16
MONTH TO DATE 161 229 -68 205
SINCE SEP 1 182 274 -92 212
SINCE JUL 1 182 275 -93 214
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 44 19 25 12
SINCE SEP 1 268 171 97 182
SINCE JAN 1 1548 1227 321 1330
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 6 HIGHEST WIND DIRECTION E (110)
HIGHEST GUST SPEED 10 HIGHEST GUST DIRECTION E (90)
AVERAGE WIND SPEED 2.4
SKY COVER
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 3:00 AM
LOWEST 46 4:00 PM
AVERAGE 72
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 64 86 2023
MINIMUM TEMPERATURE (F) 41 22 1976
SUNRISE AND SUNSET
OCTOBER 28 2026.......SUNRISE 7:33 AM EDT SUNSET 6:14 PM EDT
OCTOBER 29 2026.......SUNRISE 7:34 AM EDT SUNSET 6:13 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-272128:IAD:2026-10-27:interim · iem-afos · IEM archive
SHA-256 ea95b2d53730ea5038c5c5c922f10111933db8f6e4029db3f288596850a806ed
Product text
CDUS41 KLWX 272128
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
528 PM EDT TUE OCT 27 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 27 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 72 3:52 PM 84 1963 64 8 62
MINIMUM 44 5:48 AM 21 1988 41 3 35
AVERAGE 58 52 6 49
PRECIPITATION (IN)
TODAY 0.00 1.89 2003 0.10 -0.10 0.00
MONTH TO DATE 3.61 3.20 0.41 0.97
SINCE SEP 1 7.41 7.14 0.27 2.19
SINCE JAN 1 36.81 36.36 0.45 26.83
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 7 13 -6 16
MONTH TO DATE 161 229 -68 205
SINCE SEP 1 182 274 -92 212
SINCE JUL 1 182 275 -93 214
COOLING
TODAY 0 0 0 0
MONTH TO DATE 44 19 25 12
SINCE SEP 1 268 171 97 182
SINCE JAN 1 1548 1227 321 1330
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 6 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 10 HIGHEST GUST DIRECTION E (90)
AVERAGE WIND SPEED 2.4
SKY COVER
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 3:00 AM
LOWEST 46 4:00 PM
AVERAGE 72
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 64 86 2023
MINIMUM TEMPERATURE (F) 41 22 1976
SUNRISE AND SUNSET
OCTOBER 27 2026.......SUNRISE 7:32 AM EDT SUNSET 6:15 PM EDT
OCTOBER 28 2026.......SUNRISE 7:33 AM EDT SUNSET 6:14 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/2026-10-27 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.