NWS CLI archive · settlement source
CLIBOS · 보스턴 · America/New_York · ← 2026-09-17 · 2026-09-19 → · All dates for KBOS · JSON · METAR-derived record
Final issued 2026-09-19 01:39:00 EDT · Product id iem:CDUS41-KBOX-190539:BOS:2026-09-18:final · IEM archive
Product id iem:CDUS41-KBOX-190539:BOS:2026-09-18:final · iem-afos · IEM archive
SHA-256 ecdd5a5ef660232f7b8f3587439ba2010ab040c4cb9cdc2d8e512ac801941289
Product text
CDUS41 KBOX 190539
CLIBOS
CLIMATE REPORT
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
139 AM EDT SAT SEP 19 2026
...................................
...THE BOSTON MA CLIMATE SUMMARY FOR SEPTEMBER 18 2026...
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1872 TO 2026
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...................................................................
TEMPERATURE (F)
YESTERDAY
MAXIMUM 80 158 PM 90 1891 72 8 74
1906
1955
MINIMUM 62 1159 PM 43 1875 58 4 62
AVERAGE 71 65 6 68
PRECIPITATION (IN)
YESTERDAY T 2.87 2004 0.13 -0.13 0.11
MONTH TO DATE 1.70 2.03 -0.33 1.55
SINCE SEP 1 1.70 2.03 -0.33 1.55
SINCE JAN 1 19.26 30.07 -10.81 26.50
SNOWFALL (IN)
YESTERDAY 0.0 0.0 2000 0.0 0.0 0.0
2001
2002
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
DEGREE DAYS
HEATING
YESTERDAY 0 2 -2 0
MONTH TO DATE 7 22 -15 18
SINCE SEP 1 7 22 -15 18
SINCE JUL 1 7 31 -24 25
COOLING
YESTERDAY 6 2 4 3
MONTH TO DATE 77 72 5 38
SINCE SEP 1 77 72 5 38
SINCE JAN 1 994 772 222 795
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 9 RESULTANT WIND DIRECTION NW (320)
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION N (340)
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION N (340)
AVERAGE WIND SPEED 10.9
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 200 AM
LOWEST 37 500 PM
AVERAGE 65
..........................................................
THE BOSTON MA CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 72 92 1983
MINIMUM TEMPERATURE (F) 57 42 1929
SUNRISE AND SUNSET
SEPTEMBER 19 2026.....SUNRISE 628 AM EDT SUNSET 647 PM EDT
SEPTEMBER 20 2026.....SUNRISE 629 AM EDT SUNSET 645 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-KBOX-182128:BOS:2026-09-18:interim · iem-afos · IEM archive
SHA-256 ccd716be927992de553928ff8ab52471218beb61e29850efbc2c249926a815dd
Product text
CDUS41 KBOX 182128
CLIBOS
CLIMATE REPORT
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
528 PM EDT FRI SEP 18 2026
...................................
...THE BOSTON MA CLIMATE SUMMARY FOR SEPTEMBER 18 2026...
VALID TODAY AS OF 0500 PM LOCAL TIME.
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1872 TO 2026
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...................................................................
TEMPERATURE (F)
TODAY
MAXIMUM 80 158 PM 90 1891 72 8 74
1906
1955
MINIMUM 66 546 AM 43 1875 58 8 62
AVERAGE 73 65 8 68
PRECIPITATION (IN)
TODAY T 2.87 2004 0.13 -0.13 0.11
MONTH TO DATE 1.70 2.03 -0.33 1.55
SINCE SEP 1 1.70 2.03 -0.33 1.55
SINCE JAN 1 19.26 30.07 -10.81 26.50
SNOWFALL (IN)
TODAY 0.0 0.0 2000 0.0 0.0 0.0
2001
2002
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
DEGREE DAYS
HEATING
TODAY 0 2 -2 0
MONTH TO DATE 7 22 -15 18
SINCE SEP 1 7 22 -15 18
SINCE JUL 1 7 31 -24 25
COOLING
TODAY 8 2 6 3
MONTH TO DATE 79 72 7 38
SINCE SEP 1 79 72 7 38
SINCE JAN 1 996 772 224 795
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION NW (310)
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION N (340)
AVERAGE WIND SPEED 10.0
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 200 AM
LOWEST 40 100 PM
AVERAGE 67
..........................................................
THE BOSTON MA CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 72 92 1983
MINIMUM TEMPERATURE (F) 57 42 1929
SUNRISE AND SUNSET
SEPTEMBER 18 2026.....SUNRISE 627 AM EDT SUNSET 648 PM EDT
SEPTEMBER 19 2026.....SUNRISE 628 AM EDT SUNSET 647 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 KBOS for the contract date, as archived verbatim at https://weathermarket.io/nws-cli/KBOS/2026-09-18 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.