NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-10-19 · 2026-10-21 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-21 02:26:00 EDT · Product id iem:CDUS41-KLWX-210626:IAD:2026-10-20:final · IEM archive
Product id iem:CDUS41-KLWX-210626:IAD:2026-10-20:final · iem-afos · IEM archive
SHA-256 c651b517e9bccad5706c65d8828d3b9f9d51b5fb1cb35359717f3e253f3337fe
Product text
CDUS41 KLWX 210626
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
226 AM EDT WED OCT 21 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 20 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 3:05 PM 83 1969 66 5 68
2016
MINIMUM 42 2:33 AM 20 1972 44 -2 42
AVERAGE 57 55 2 55
PRECIPITATION (IN)
YESTERDAY 0.00 1.44 2019 0.12 -0.12 0.01
MONTH TO DATE 3.61 2.40 1.21 0.85
SINCE SEP 1 7.41 6.34 1.07 2.07
SINCE JAN 1 36.81 35.56 1.25 26.71
SNOWFALL (IN)
YESTERDAY 0.0 T 1974 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 8 10 -2 10
MONTH TO DATE 82 147 -65 102
SINCE SEP 1 103 192 -89 109
SINCE JUL 1 103 193 -90 111
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 15 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION N (350)
AVERAGE WIND SPEED 7.3
SKY COVER
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 85 2:00 AM
LOWEST 32 3:00 PM
AVERAGE 59
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 66 86 1979
MINIMUM TEMPERATURE (F) 43 22 1972
SUNRISE AND SUNSET
OCTOBER 21 2026.......SUNRISE 7:25 AM EDT SUNSET 6:23 PM EDT
OCTOBER 22 2026.......SUNRISE 7:26 AM EDT SUNSET 6:21 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-202129:IAD:2026-10-20:interim · iem-afos · IEM archive
SHA-256 7d3e09be6ba763d98820364ded130ac609be1e13af57680417ca9cf975f80878
Product text
CDUS41 KLWX 202129
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
529 PM EDT TUE OCT 20 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 20 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 3:05 PM 83 1969 66 5 68
2016
MINIMUM 42 2:33 AM 20 1972 44 -2 42
AVERAGE 57 55 2 55
PRECIPITATION (IN)
TODAY 0.00 1.44 2019 0.12 -0.12 0.01
MONTH TO DATE 3.61 2.40 1.21 0.85
SINCE SEP 1 7.41 6.34 1.07 2.07
SINCE JAN 1 36.81 35.56 1.25 26.71
SNOWFALL (IN)
TODAY 0.0 T 1974 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 8 10 -2 10
MONTH TO DATE 82 147 -65 102
SINCE SEP 1 103 192 -89 109
SINCE JUL 1 103 193 -90 111
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 15 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION N (350)
AVERAGE WIND SPEED 7.7
SKY COVER
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 85 2:00 AM
LOWEST 32 3:00 PM
AVERAGE 59
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 66 86 1979
MINIMUM TEMPERATURE (F) 43 22 1972
SUNRISE AND SUNSET
OCTOBER 20 2026.......SUNRISE 7:24 AM EDT SUNSET 6:24 PM EDT
OCTOBER 21 2026.......SUNRISE 7:25 AM EDT SUNSET 6:23 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/2026-10-20 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.