NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-09-11 · 2026-09-13 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-09-13 02:23:00 EDT · Product id iem:CDUS41-KLWX-130623:IAD:2026-09-12:final · IEM archive
Product id iem:CDUS41-KLWX-130623:IAD:2026-09-12:final · iem-afos · IEM archive
SHA-256 ae9b51b165cb025fd1f407caf2b51361c918d26054c4c6b0c4d1013b47b01835
Product text
CDUS41 KLWX 130623
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
223 AM EDT SUN SEP 13 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 12 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 80 4:43 PM 95 1998 81 -1 84
2019
MINIMUM 66 12:23 AM 40 1967 60 6 56
AVERAGE 73 70 3 70
PRECIPITATION (IN)
YESTERDAY T 1.18 1965 0.13 -0.13 0.00
MONTH TO DATE 1.39 1.48 -0.09 0.18
SINCE SEP 1 1.39 1.48 -0.09 0.18
SINCE JAN 1 30.79 30.70 0.09 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 3 -3 6
SINCE SEP 1 0 3 -3 6
SINCE JUL 1 0 4 -4 8
COOLING
YESTERDAY 8 6 2 5
MONTH TO DATE 142 86 56 50
SINCE SEP 1 142 86 56 50
SINCE JAN 1 1422 1142 280 1198
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION SE (130)
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION SE (140)
AVERAGE WIND SPEED 5.8
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 94 11:00 PM
LOWEST 69 11:00 AM
AVERAGE 82
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 80 94 1974
MINIMUM TEMPERATURE (F) 59 43 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.
$$Product id iem:CDUS41-KLWX-122125:IAD:2026-09-12:interim · iem-afos · IEM archive
SHA-256 b2621f98355ae960ec28c5c506f779c279f22f16b3b9dac43269b21afe1d1d3f
Product text
CDUS41 KLWX 122125
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
525 PM EDT SAT SEP 12 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 12 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 80 3:44 PM 95 1998 81 -1 84
2019
MINIMUM 66 12:23 AM 40 1967 60 6 56
AVERAGE 73 70 3 70
PRECIPITATION (IN)
TODAY T 1.18 1965 0.13 -0.13 0.00
MONTH TO DATE 1.39 1.48 -0.09 0.18
SINCE SEP 1 1.39 1.48 -0.09 0.18
SINCE JAN 1 30.79 30.70 0.09 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 3 -3 6
SINCE SEP 1 0 3 -3 6
SINCE JUL 1 0 4 -4 8
COOLING
TODAY 8 6 2 5
MONTH TO DATE 142 86 56 50
SINCE SEP 1 142 86 56 50
SINCE JAN 1 1422 1142 280 1198
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION SE (130)
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION SE (140)
AVERAGE WIND SPEED 5.6
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 2:00 AM
LOWEST 69 11:00 AM
AVERAGE 81
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 80 94 1974
MINIMUM TEMPERATURE (F) 59 43 1985
SUNRISE AND SUNSET
SEPTEMBER 12 2026.....SUNRISE 6:49 AM EDT SUNSET 7:23 PM EDT
SEPTEMBER 13 2026.....SUNRISE 6:49 AM EDT SUNSET 7:21 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/2026-09-12 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.