NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-10-17 · 2026-10-19 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-19 02:22:00 EDT · Product id iem:CDUS41-KLWX-190622:IAD:2026-10-18:final · IEM archive
Product id iem:CDUS41-KLWX-190622:IAD:2026-10-18:final · iem-afos · IEM archive
SHA-256 5eb7fe768d0aed66474315946557991d6c9687f16b5be715c5bd7029108417eb
Product text
CDUS41 KLWX 190622
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
222 AM EDT MON OCT 19 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 18 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 62 4:11 PM 85 2016 67 -5 76
MINIMUM 37 6:08 AM 27 1976 44 -7 44
1982
AVERAGE 50 56 -6 60
PRECIPITATION (IN)
YESTERDAY 0.00 2.09 1996 0.12 -0.12 0.00
MONTH TO DATE 3.61 2.16 1.45 0.43
SINCE SEP 1 7.41 6.10 1.31 1.65
SINCE JAN 1 36.81 35.32 1.49 26.29
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 15 10 5 5
MONTH TO DATE 61 127 -66 91
SINCE SEP 1 82 172 -90 98
SINCE JUL 1 82 173 -91 100
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 13 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 3.9
SKY COVER
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 82 9:00 PM
LOWEST 23 3:00 PM
AVERAGE 53
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 67 87 2016
MINIMUM TEMPERATURE (F) 44 25 1976
SUNRISE AND SUNSET
OCTOBER 19 2026.......SUNRISE 7:23 AM EDT SUNSET 6:25 PM EDT
OCTOBER 20 2026.......SUNRISE 7:24 AM EDT SUNSET 6:24 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-182130:IAD:2026-10-18:interim · iem-afos · IEM archive
SHA-256 ed1f5ecb38575434318032d2821c5bc39b8f625c49f20d08964e21d5c11a415e
Product text
CDUS41 KLWX 182130
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
530 PM EDT SUN OCT 18 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 18 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 62 3:55 PM 85 2016 67 -5 76
MINIMUM 37 6:08 AM 27 1976 44 -7 44
1982
AVERAGE 50 56 -6 60
PRECIPITATION (IN)
TODAY 0.00 2.09 1996 0.12 -0.12 0.00
MONTH TO DATE 3.61 2.16 1.45 0.43
SINCE SEP 1 7.41 6.10 1.31 1.65
SINCE JAN 1 36.81 35.32 1.49 26.29
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 15 10 5 5
MONTH TO DATE 61 127 -66 91
SINCE SEP 1 82 172 -90 98
SINCE JUL 1 82 173 -91 100
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 13 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 6.0
SKY COVER
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 78 6:00 AM
LOWEST 23 3:00 PM
AVERAGE 51
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 67 87 2016
MINIMUM TEMPERATURE (F) 44 25 1976
SUNRISE AND SUNSET
OCTOBER 18 2026.......SUNRISE 7:22 AM EDT SUNSET 6:27 PM EDT
OCTOBER 19 2026.......SUNRISE 7:23 AM EDT SUNSET 6:25 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/2026-10-18 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.