NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-23 · 2026-09-25 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-25 02:27:00 EDT · Product id iem:CDUS41-KLWX-250627:IAD:2026-09-24:final · IEM archive
Product id iem:CDUS41-KLWX-250627:IAD:2026-09-24:final · iem-afos · IEM archive
SHA-256 2176ccc1d3a27a805ac8cf60a238bd675181f07a765bcafe5cc3eb8af5751407
Product text
CDUS41 KLWX 250627
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
227 AM EDT FRI SEP 25 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 24 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 66 4:11 PM 97 2010 76 -10 79
MINIMUM 50 11:31 PM 30 1974 55 -5 63
AVERAGE 58 65 -7 71
PRECIPITATION (IN)
YESTERDAY 0.00 2.17 2001 0.13 -0.13 T
MONTH TO DATE 3.61 3.11 0.50 1.06
SINCE SEP 1 3.61 3.11 0.50 1.06
SINCE JAN 1 33.01 32.33 0.68 25.70
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 7 2 5 0
MONTH TO DATE 17 22 -5 7
SINCE SEP 1 17 22 -5 7
SINCE JUL 1 17 23 -6 9
COOLING
YESTERDAY 0 3 -3 6
MONTH TO DATE 191 137 54 124
SINCE SEP 1 191 137 54 124
SINCE JAN 1 1471 1193 278 1272
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION N (20)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION NE (30)
AVERAGE WIND SPEED 8.8
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 83 1:00 AM
LOWEST 52 5:00 PM
AVERAGE 68
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 76 93 2010
MINIMUM TEMPERATURE (F) 54 33 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.
$$Product id iem:CDUS41-KLWX-242121:IAD:2026-09-24:interim · iem-afos · IEM archive
SHA-256 52c11854d2aaa4404f3d5d5b344a3a48e8ad7237931846aaed67ccaf15e86577
Product text
CDUS41 KLWX 242121
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
521 PM EDT THU SEP 24 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 24 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 66 3:51 PM 97 2010 76 -10 79
MINIMUM 51 6:52 AM 30 1974 55 -4 63
AVERAGE 59 65 -6 71
PRECIPITATION (IN)
TODAY 0.00 2.17 2001 0.13 -0.13 T
MONTH TO DATE 3.61 3.11 0.50 1.06
SINCE SEP 1 3.61 3.11 0.50 1.06
SINCE JAN 1 33.01 32.33 0.68 25.70
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 6 2 4 0
MONTH TO DATE 16 22 -6 7
SINCE SEP 1 16 22 -6 7
SINCE JUL 1 16 23 -7 9
COOLING
TODAY 0 3 -3 6
MONTH TO DATE 191 137 54 124
SINCE SEP 1 191 137 54 124
SINCE JAN 1 1471 1193 278 1272
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION N (20)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION NE (30)
AVERAGE WIND SPEED 9.7
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 83 1:00 AM
LOWEST 56 3:00 PM
AVERAGE 70
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 76 93 2010
MINIMUM TEMPERATURE (F) 54 33 1983
SUNRISE AND SUNSET
SEPTEMBER 24 2026.....SUNRISE 6:59 AM EDT SUNSET 7:03 PM EDT
SEPTEMBER 25 2026.....SUNRISE 7:00 AM EDT SUNSET 7:02 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/2026-09-24 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.