NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-10-16 · 2026-10-18 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-18 02:24:00 EDT · Product id iem:CDUS41-KLWX-180624:IAD:2026-10-17:final · IEM archive
Product id iem:CDUS41-KLWX-180624:IAD:2026-10-17:final · iem-afos · IEM archive
SHA-256 1aaf7cdabe83f59b4bbf120c374b84c82e5131c29dc488c2d29562093bf43edf
Product text
CDUS41 KLWX 180624
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
224 AM EDT SUN OCT 18 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 17 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 61 1:17 AM 84 2016 67 -6 66
MINIMUM 44 11:59 PM 31 1981 45 -1 34
1982
AVERAGE 53 56 -3 50
PRECIPITATION (IN)
YESTERDAY 0.03 1.11 1975 0.11 -0.08 0.00
MONTH TO DATE 3.61 2.04 1.57 0.43
SINCE SEP 1 7.41 5.98 1.43 1.65
SINCE JAN 1 36.81 35.20 1.61 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 12 9 3 15
MONTH TO DATE 46 117 -71 86
SINCE SEP 1 67 162 -95 93
SINCE JUL 1 67 163 -96 95
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 23 HIGHEST WIND DIRECTION N (340)
HIGHEST GUST SPEED 38 HIGHEST GUST DIRECTION N (350)
AVERAGE WIND SPEED 12.3
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 83 5:00 AM
LOWEST 36 2:00 PM
AVERAGE 60
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 67 85 2016
MINIMUM TEMPERATURE (F) 44 27 1976
1982
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.
$$Product id iem:CDUS41-KLWX-172129:IAD:2026-10-17:interim · iem-afos · IEM archive
SHA-256 c85b31dc858b7daf3acab18c06466980bfa975906204acf3b8257ca8122ebce0
Product text
CDUS41 KLWX 172129
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
529 PM EDT SAT OCT 17 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 17 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 61 1:17 AM 84 2016 67 -6 66
MINIMUM 52 10:58 AM 31 1981 45 7 34
1982
AVERAGE 57 56 1 50
PRECIPITATION (IN)
TODAY 0.03 1.11 1975 0.11 -0.08 0.00
MONTH TO DATE 3.61 2.04 1.57 0.43
SINCE SEP 1 7.41 5.98 1.43 1.65
SINCE JAN 1 36.81 35.20 1.61 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 8 9 -1 15
MONTH TO DATE 42 117 -75 86
SINCE SEP 1 63 162 -99 93
SINCE JUL 1 63 163 -100 95
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 23 HIGHEST WIND DIRECTION N (340)
HIGHEST GUST SPEED 38 HIGHEST GUST DIRECTION N (350)
AVERAGE WIND SPEED 13.0
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 83 5:00 AM
LOWEST 36 2:00 PM
AVERAGE 60
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 67 85 2016
MINIMUM TEMPERATURE (F) 44 27 1976
1982
SUNRISE AND SUNSET
OCTOBER 17 2026.......SUNRISE 7:21 AM EDT SUNSET 6:28 PM EDT
OCTOBER 18 2026.......SUNRISE 7:22 AM EDT SUNSET 6:27 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/2026-10-17 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.