NWS CLI archive · settlement source
CLIIAD · 워싱턴 D.C. · America/New_York · ← 2026-10-14 · 2026-10-16 → · All dates for KIAD · JSON · METAR-derived record
Final issued 2026-10-16 02:29:00 EDT · Product id iem:CDUS41-KLWX-160629:IAD:2026-10-15:final · IEM archive
Product id iem:CDUS41-KLWX-160629:IAD:2026-10-15:final · iem-afos · IEM archive
SHA-256 1aa5f5adb237f0766f3f1ebe60d9e751e9bb3094951e5ffde90ba84870578ecf
Product text
CDUS41 KLWX 160629
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
229 AM EDT FRI OCT 16 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 15 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 77 12:34 AM 88 1989 68 9 73
MINIMUM 59 10:28 PM 28 1987 46 13 54
AVERAGE 68 57 11 64
PRECIPITATION (IN)
YESTERDAY 0.14 1.30 2014 0.12 0.02 0.00
MONTH TO DATE 3.41 1.81 1.60 0.43
SINCE SEP 1 7.21 5.75 1.46 1.65
SINCE JAN 1 36.61 34.97 1.64 26.29
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 9 -9 1
MONTH TO DATE 34 99 -65 58
SINCE SEP 1 55 144 -89 65
SINCE JUL 1 55 145 -90 67
COOLING
YESTERDAY 3 0 3 0
MONTH TO DATE 38 19 19 12
SINCE SEP 1 262 171 91 182
SINCE JAN 1 1542 1227 315 1330
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION N (360)
AVERAGE WIND SPEED 6.4
SKY COVER
AVERAGE SKY COVER 1.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 96 11:00 PM
LOWEST 65 1:00 PM
AVERAGE 81
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 68 85 1989
MINIMUM TEMPERATURE (F) 45 30 1986
SUNRISE AND SUNSET
OCTOBER 16 2026.......SUNRISE 7:20 AM EDT SUNSET 6:30 PM EDT
OCTOBER 17 2026.......SUNRISE 7:21 AM EDT SUNSET 6:28 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-152143:IAD:2026-10-15:interim · iem-afos · IEM archive
SHA-256 149afe5c7d939769ca8ac20877cb0bf3e31d682c74dffe88a88e03fd04269c35
Product text
CDUS41 KLWX 152143
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
543 PM EDT THU OCT 15 2026
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR OCTOBER 15 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 77 12:34 AM 88 1989 68 9 73
MINIMUM 59 3:41 PM 28 1987 46 13 54
AVERAGE 68 57 11 64
PRECIPITATION (IN)
TODAY 0.07 1.30 2014 0.12 -0.05 0.00
MONTH TO DATE 3.34 1.81 1.53 0.43
SINCE SEP 1 7.14 5.75 1.39 1.65
SINCE JAN 1 36.54 34.97 1.57 26.29
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 9 -9 1
MONTH TO DATE 34 99 -65 58
SINCE SEP 1 55 144 -89 65
SINCE JUL 1 55 145 -90 67
COOLING
TODAY 3 0 3 0
MONTH TO DATE 38 19 19 12
SINCE SEP 1 262 171 91 182
SINCE JAN 1 1542 1227 315 1330
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION N (360)
AVERAGE WIND SPEED 8.0
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 90 3:00 PM
LOWEST 65 1:00 PM
AVERAGE 78
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 68 85 1989
MINIMUM TEMPERATURE (F) 45 30 1986
SUNRISE AND SUNSET
OCTOBER 15 2026.......SUNRISE 7:19 AM EDT SUNSET 6:31 PM EDT
OCTOBER 16 2026.......SUNRISE 7:20 AM EDT SUNSET 6:30 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/2026-10-15 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.