NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-12 · 2026-09-14 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-14 02:24:00 EDT · Product id iem:CDUS41-KLWX-140624:IAD:2026-09-13:final · IEM archive
Product id iem:CDUS41-KLWX-140624:IAD:2026-09-13:final · iem-afos · IEM archive
SHA-256 436b23b122baa3908bf111a3d02c962b45af95b07ba9a276e53d2f3bbcc15f39
Product text
CDUS41 KLWX 140624
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
224 AM EDT MON SEP 14 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 13 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 90 3:19 PM 94 1974 80 10 87
MINIMUM 72 6:46 AM 43 1985 59 13 51
AVERAGE 81 70 11 69
PRECIPITATION (IN)
YESTERDAY 0.03 0.68 1983 0.13 -0.10 0.00
MONTH TO DATE 1.42 1.61 -0.19 0.18
SINCE SEP 1 1.42 1.61 -0.19 0.18
SINCE JAN 1 30.82 30.83 -0.01 24.82
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 0 1 -1 0
MONTH TO DATE 0 4 -4 6
SINCE SEP 1 0 4 -4 6
SINCE JUL 1 0 5 -5 8
COOLING
YESTERDAY 16 6 10 4
MONTH TO DATE 158 92 66 54
SINCE SEP 1 158 92 66 54
SINCE JAN 1 1438 1148 290 1202
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION NE (60)
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION W (260)
AVERAGE WIND SPEED 3.0
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 5:00 AM
LOWEST 55 3:00 PM
AVERAGE 78
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 80 95 1998
MINIMUM TEMPERATURE (F) 59 37 1985
SUNRISE AND SUNSET
SEPTEMBER 14 2026.....SUNRISE 6:50 AM EDT SUNSET 7:20 PM EDT
SEPTEMBER 15 2026.....SUNRISE 6:51 AM EDT SUNSET 7:18 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-132125:IAD:2026-09-13:interim · iem-afos · IEM archive
SHA-256 96b3300692ac1d43040f693493e697691caebe66862932e2f6fbfaebab5de63a
Product text
CDUS41 KLWX 132125
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
525 PM EDT SUN SEP 13 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 13 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 90 3:19 PM 94 1974 80 10 87
MINIMUM 72 6:46 AM 43 1985 59 13 51
AVERAGE 81 70 11 69
PRECIPITATION (IN)
TODAY 0.03 0.68 1983 0.13 -0.10 0.00
MONTH TO DATE 1.42 1.61 -0.19 0.18
SINCE SEP 1 1.42 1.61 -0.19 0.18
SINCE JAN 1 30.82 30.83 -0.01 24.82
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 0 1 -1 0
MONTH TO DATE 0 4 -4 6
SINCE SEP 1 0 4 -4 6
SINCE JUL 1 0 5 -5 8
COOLING
TODAY 16 6 10 4
MONTH TO DATE 158 92 66 54
SINCE SEP 1 158 92 66 54
SINCE JAN 1 1438 1148 290 1202
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION NE (60)
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION W (260)
AVERAGE WIND SPEED 3.4
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 5:00 AM
LOWEST 55 3:00 PM
AVERAGE 78
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 80 95 1998
MINIMUM TEMPERATURE (F) 59 37 1985
SUNRISE AND SUNSET
SEPTEMBER 13 2026.....SUNRISE 6:49 AM EDT SUNSET 7:21 PM EDT
SEPTEMBER 14 2026.....SUNRISE 6:50 AM EDT SUNSET 7:20 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/2026-09-13 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.