NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-10-25 · 2026-10-27 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-27 02:25:00 EDT · Product id iem:CDUS41-KLWX-270625:IAD:2026-10-26:final · IEM archive
Product id iem:CDUS41-KLWX-270625:IAD:2026-10-26:final · iem-afos · IEM archive
SHA-256 b54d51e26fdff0a300c63f7cb4a83dbe9ebbc36c422a03ee825761da7ae33b26
Product text
CDUS41 KLWX 270625
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
225 AM EDT TUE OCT 27 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 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 71 3:46 PM 84 2023 64 7 62
MINIMUM 38 6:32 AM 26 1972 41 -3 35
1987
1988
AVERAGE 55 53 2 49
PRECIPITATION (IN)
YESTERDAY 0.00 1.76 1977 0.11 -0.11 0.00
MONTH TO DATE 3.61 3.10 0.51 0.97
SINCE SEP 1 7.41 7.04 0.37 2.19
SINCE JAN 1 36.81 36.26 0.55 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 10 12 -2 16
MONTH TO DATE 154 216 -62 189
SINCE SEP 1 175 261 -86 196
SINCE JUL 1 175 262 -87 198
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 9 HIGHEST WIND DIRECTION W (290)
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION W (280)
AVERAGE WIND SPEED 1.6
SKY COVER
AVERAGE SKY COVER 0.1
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 1:00 AM
LOWEST 36 3:00 PM
AVERAGE 68
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 64 84 1963
MINIMUM TEMPERATURE (F) 41 21 1988
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.
$$Product id iem:CDUS41-KLWX-262125:IAD:2026-10-26:interim · iem-afos · IEM archive
SHA-256 71cb541409871a7b17ea2ddc137c7bdc242458931a8d6bdf85bb3c1bc485e01c
Product text
CDUS41 KLWX 262125
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
525 PM EDT MON OCT 26 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 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 71 3:46 PM 84 2023 64 7 62
MINIMUM 38 6:32 AM 26 1972 41 -3 35
1987
1988
AVERAGE 55 53 2 49
PRECIPITATION (IN)
TODAY 0.00 1.76 1977 0.11 -0.11 0.00
MONTH TO DATE 3.61 3.10 0.51 0.97
SINCE SEP 1 7.41 7.04 0.37 2.19
SINCE JAN 1 36.81 36.26 0.55 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 10 12 -2 16
MONTH TO DATE 154 216 -62 189
SINCE SEP 1 175 261 -86 196
SINCE JUL 1 175 262 -87 198
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 9 HIGHEST WIND DIRECTION W (290)
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION W (280)
AVERAGE WIND SPEED 2.3
SKY COVER
AVERAGE SKY COVER 0.1
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 1:00 AM
LOWEST 36 3:00 PM
AVERAGE 68
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 64 84 1963
MINIMUM TEMPERATURE (F) 41 21 1988
SUNRISE AND SUNSET
OCTOBER 26 2026.......SUNRISE 7:31 AM EDT SUNSET 6:16 PM EDT
OCTOBER 27 2026.......SUNRISE 7:32 AM EDT SUNSET 6:15 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/2026-10-26 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.