NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-24 · 2026-09-26 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-26 02:32:00 EDT · Product id iem:CDUS41-KLWX-260632:IAD:2026-09-25:final · IEM archive
Product id iem:CDUS41-KLWX-260632:IAD:2026-09-25:final · iem-afos · IEM archive
SHA-256 d747838fd748374db0223da0c88ace400d6ea08d43d49bc10216ab1c031bef66
Product text
CDUS41 KLWX 260632
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
232 AM EDT SAT SEP 26 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 25 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 74 2:55 PM 93 2010 76 -2 82
MINIMUM 52 12:34 AM 33 1983 54 -2 70
AVERAGE 63 65 -2 76
PRECIPITATION (IN)
YESTERDAY 0.00 2.67 1975 0.13 -0.13 0.16
MONTH TO DATE 3.61 3.24 0.37 1.22
SINCE SEP 1 3.61 3.24 0.37 1.22
SINCE JAN 1 33.01 32.46 0.55 25.86
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 2 3 -1 0
MONTH TO DATE 19 25 -6 7
SINCE SEP 1 19 25 -6 7
SINCE JUL 1 19 26 -7 9
COOLING
YESTERDAY 0 3 -3 11
MONTH TO DATE 191 140 51 135
SINCE SEP 1 191 140 51 135
SINCE JAN 1 1471 1196 275 1283
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 21 HIGHEST WIND DIRECTION N (350)
HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION N (350)
AVERAGE WIND SPEED 12.4
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 77 12:00 AM
LOWEST 27 2:00 PM
AVERAGE 52
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 75 93 2007
MINIMUM TEMPERATURE (F) 54 38 1964
1983
SUNRISE AND SUNSET
SEPTEMBER 26 2026.....SUNRISE 7:01 AM EDT SUNSET 7:00 PM EDT
SEPTEMBER 27 2026.....SUNRISE 7:02 AM EDT SUNSET 6:59 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-252124:IAD:2026-09-25:interim · iem-afos · IEM archive
SHA-256 108f17dcca968040073735184c300de197deebfc2d6fbd06acada68cdce36fcd
Product text
CDUS41 KLWX 252124
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
524 PM EDT FRI SEP 25 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 25 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 74 2:55 PM 93 2010 76 -2 82
MINIMUM 52 12:34 AM 33 1983 54 -2 70
AVERAGE 63 65 -2 76
PRECIPITATION (IN)
TODAY 0.00 2.67 1975 0.13 -0.13 0.16
MONTH TO DATE 3.61 3.24 0.37 1.22
SINCE SEP 1 3.61 3.24 0.37 1.22
SINCE JAN 1 33.01 32.46 0.55 25.86
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 2 3 -1 0
MONTH TO DATE 19 25 -6 7
SINCE SEP 1 19 25 -6 7
SINCE JUL 1 19 26 -7 9
COOLING
TODAY 0 3 -3 11
MONTH TO DATE 191 140 51 135
SINCE SEP 1 191 140 51 135
SINCE JAN 1 1471 1196 275 1283
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 21 HIGHEST WIND DIRECTION N (350)
HIGHEST GUST SPEED 30 HIGHEST GUST DIRECTION N (350)
AVERAGE WIND SPEED 12.8
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 77 12:00 AM
LOWEST 27 2:00 PM
AVERAGE 52
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 75 93 2007
MINIMUM TEMPERATURE (F) 54 38 1964
1983
SUNRISE AND SUNSET
SEPTEMBER 25 2026.....SUNRISE 7:00 AM EDT SUNSET 7:02 PM EDT
SEPTEMBER 26 2026.....SUNRISE 7:01 AM EDT SUNSET 7:00 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/2026-09-25 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.