NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-10-15 · 2026-10-17 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-17 02:23:00 EDT · Product id iem:CDUS41-KLWX-170623:IAD:2026-10-16:final · IEM archive
Product id iem:CDUS41-KLWX-170623:IAD:2026-10-16:final · iem-afos · IEM archive
SHA-256 f573a2a8d3852be52f5929a628b8e1fe64de86b9336f66f734dfbc273e4a49c2
Product text
CDUS41 KLWX 170623
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
223 AM EDT SAT OCT 17 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 16 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 82 3:39 PM 85 1989 68 14 65
MINIMUM 60 2:15 AM 30 1986 45 15 39
AVERAGE 71 56 15 52
PRECIPITATION (IN)
YESTERDAY 0.17 1.10 2002 0.12 0.05 0.00
MONTH TO DATE 3.58 1.93 1.65 0.43
SINCE SEP 1 7.38 5.87 1.51 1.65
SINCE JAN 1 36.78 35.09 1.69 26.29
SNOWFALL (IN)
YESTERDAY 0.0 T 1977 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 0 9 -9 13
MONTH TO DATE 34 108 -74 71
SINCE SEP 1 55 153 -98 78
SINCE JUL 1 55 154 -99 80
COOLING
YESTERDAY 6 0 6 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 29 HIGHEST WIND DIRECTION NW (320)
HIGHEST GUST SPEED 41 HIGHEST GUST DIRECTION NW (320)
AVERAGE WIND SPEED 9.3
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
THUNDERSTORM
RAIN
LIGHT RAIN
FOG
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 7:00 AM
LOWEST 63 10:00 PM
AVERAGE 80
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 67 84 2016
MINIMUM TEMPERATURE (F) 45 31 1981
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.
$$Product id iem:CDUS41-KLWX-162132:IAD:2026-10-16:interim · iem-afos · IEM archive
SHA-256 a95cba4e104503b4acf2dd02c68dadcac8612ce608dd4e98f97e056a2d28f3e0
Product text
CDUS41 KLWX 162132
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
532 PM EDT FRI OCT 16 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 16 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 82 3:39 PM 85 1989 68 14 65
MINIMUM 60 2:15 AM 30 1986 45 15 39
AVERAGE 71 56 15 52
PRECIPITATION (IN)
TODAY T 1.10 2002 0.12 -0.12 0.00
MONTH TO DATE 3.41 1.93 1.48 0.43
SINCE SEP 1 7.21 5.87 1.34 1.65
SINCE JAN 1 36.61 35.09 1.52 26.29
SNOWFALL (IN)
TODAY 0.0 T 1977 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 0 9 -9 13
MONTH TO DATE 34 108 -74 71
SINCE SEP 1 55 153 -98 78
SINCE JUL 1 55 154 -99 80
COOLING
TODAY 6 0 6 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 S (200)
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION SW (210)
AVERAGE WIND SPEED 8.8
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 7:00 AM
LOWEST 65 2:00 PM
AVERAGE 81
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 67 84 2016
MINIMUM TEMPERATURE (F) 45 31 1981
1982
SUNRISE AND SUNSET
OCTOBER 16 2026.......SUNRISE 7:20 AM EDT SUNSET 6:30 PM EDT
OCTOBER 17 2026.......SUNRISE 7:21 AM EDT SUNSET 6:28 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/2026-10-16 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.