NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-10-18 · 2026-10-20 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-20 02:21:00 EDT · Product id iem:CDUS41-KLWX-200621:IAD:2026-10-19:final · IEM archive
Product id iem:CDUS41-KLWX-200621:IAD:2026-10-19:final · iem-afos · IEM archive
SHA-256 15a0338e16bdfd230feb00c2f38ed3551ac406117e9fccaca0a8a2b44a77dd59
Product text
CDUS41 KLWX 200621
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
221 AM EDT TUE OCT 20 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 19 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 68 3:35 PM 87 2016 67 1 78
MINIMUM 36 4:47 AM 25 1976 44 -8 50
AVERAGE 52 55 -3 64
PRECIPITATION (IN)
YESTERDAY 0.00 1.36 1966 0.12 -0.12 0.41
MONTH TO DATE 3.61 2.28 1.33 0.84
SINCE SEP 1 7.41 6.22 1.19 2.06
SINCE JAN 1 36.81 35.44 1.37 26.70
SNOWFALL (IN)
YESTERDAY 0.0 0.1 1972 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 13 10 3 1
MONTH TO DATE 74 137 -63 92
SINCE SEP 1 95 182 -87 99
SINCE JUL 1 95 183 -88 101
COOLING
YESTERDAY 0 0 0 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 14 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION N (360)
AVERAGE WIND SPEED 5.9
SKY COVER
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 12:00 AM
LOWEST 28 4:00 PM
AVERAGE 61
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 66 83 1969
2016
MINIMUM TEMPERATURE (F) 44 20 1972
SUNRISE AND SUNSET
OCTOBER 20 2026.......SUNRISE 7:24 AM EDT SUNSET 6:24 PM EDT
OCTOBER 21 2026.......SUNRISE 7:25 AM EDT SUNSET 6:23 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-192133:IAD:2026-10-19:interim · iem-afos · IEM archive
SHA-256 497775973a8481941b8fdb3f7d9523003aec00e878e4c027970f6f76eaa492ee
Product text
CDUS41 KLWX 192133
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
533 PM EDT MON OCT 19 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 19 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 68 3:35 PM 87 2016 67 1 78
MINIMUM 36 4:47 AM 25 1976 44 -8 50
AVERAGE 52 55 -3 64
PRECIPITATION (IN)
TODAY 0.00 1.36 1966 0.12 -0.12 0.41
MONTH TO DATE 3.61 2.28 1.33 0.84
SINCE SEP 1 7.41 6.22 1.19 2.06
SINCE JAN 1 36.81 35.44 1.37 26.70
SNOWFALL (IN)
TODAY 0.0 0.1 1972 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 13 10 3 1
MONTH TO DATE 74 137 -63 92
SINCE SEP 1 95 182 -87 99
SINCE JUL 1 95 183 -88 101
COOLING
TODAY 0 0 0 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 14 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION N (360)
AVERAGE WIND SPEED 6.1
SKY COVER
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 12:00 AM
LOWEST 28 4:00 PM
AVERAGE 61
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 66 83 1969
2016
MINIMUM TEMPERATURE (F) 44 20 1972
SUNRISE AND SUNSET
OCTOBER 19 2026.......SUNRISE 7:23 AM EDT SUNSET 6:25 PM EDT
OCTOBER 20 2026.......SUNRISE 7:24 AM EDT SUNSET 6:24 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/2026-10-19 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.