NWS CLI archive · settlement source
CLIBOS · 보스턴 · America/New_York · ← 2026-09-20 · 2026-09-22 → · All dates for KBOS · JSON · METAR-derived record
Final issued 2026-09-22 01:29:00 EDT · Product id iem:CDUS41-KBOX-220529:BOS:2026-09-21:final · IEM archive
Product id iem:CDUS41-KBOX-220529:BOS:2026-09-21:final · iem-afos · IEM archive
SHA-256 9f4fd7c55bea4c00afdff920b2f06716ebb23afb155719f3a0c25748dccf8e3f
Product text
CDUS41 KBOX 220529
CLIBOS
CLIMATE REPORT
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
129 AM EDT TUE SEP 22 2026
...................................
...THE BOSTON MA CLIMATE SUMMARY FOR SEPTEMBER 21 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 65 114 PM 94 1895 71 -6 66
MINIMUM 55 708 AM 40 1904 56 -1 51
1929
AVERAGE 60 64 -4 59
PRECIPITATION (IN)
YESTERDAY 0.01 2.77 1961 0.13 -0.12 0.00
MONTH TO DATE 1.81 2.41 -0.60 1.55
SINCE SEP 1 1.81 2.41 -0.60 1.55
SINCE JAN 1 19.37 30.45 -11.08 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 5 3 2 6
MONTH TO DATE 25 31 -6 29
SINCE SEP 1 25 31 -6 29
SINCE JUL 1 25 40 -15 36
COOLING
YESTERDAY 0 2 -2 0
MONTH TO DATE 77 78 -1 45
SINCE SEP 1 77 78 -1 45
SINCE JAN 1 994 778 216 802
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 9 RESULTANT WIND DIRECTION NE (30)
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION NE (30)
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 10.9
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 200 AM
LOWEST 60 1100 AM
AVERAGE 79
..........................................................
THE BOSTON MA CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 71 94 1895
MINIMUM TEMPERATURE (F) 56 35 1904
SUNRISE AND SUNSET
SEPTEMBER 22 2026.....SUNRISE 631 AM EDT SUNSET 641 PM EDT
SEPTEMBER 23 2026.....SUNRISE 633 AM EDT SUNSET 640 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-212132:BOS:2026-09-21:interim · iem-afos · IEM archive
SHA-256 09dfa061c4bbcd5b0b6c8352214afeebd07df0be4a65b70edc3dbe1534d99edf
Product text
CDUS41 KBOX 212132
CLIBOS
CLIMATE REPORT
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
532 PM EDT MON SEP 21 2026
...................................
...THE BOSTON MA CLIMATE SUMMARY FOR SEPTEMBER 21 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 65 114 PM 94 1895 71 -6 66
MINIMUM 55 708 AM 40 1904 56 -1 51
1929
AVERAGE 60 64 -4 59
PRECIPITATION (IN)
TODAY 0.01 2.77 1961 0.13 -0.12 0.00
MONTH TO DATE 1.81 2.41 -0.60 1.55
SINCE SEP 1 1.81 2.41 -0.60 1.55
SINCE JAN 1 19.37 30.45 -11.08 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 5 3 2 6
MONTH TO DATE 25 31 -6 29
SINCE SEP 1 25 31 -6 29
SINCE JUL 1 25 40 -15 36
COOLING
TODAY 0 2 -2 0
MONTH TO DATE 77 78 -1 45
SINCE SEP 1 77 78 -1 45
SINCE JAN 1 994 778 216 802
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION NE (30)
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 12.5
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 200 AM
LOWEST 60 1100 AM
AVERAGE 79
..........................................................
THE BOSTON MA CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 71 94 1895
MINIMUM TEMPERATURE (F) 56 35 1904
SUNRISE AND SUNSET
SEPTEMBER 21 2026.....SUNRISE 630 AM EDT SUNSET 643 PM EDT
SEPTEMBER 22 2026.....SUNRISE 631 AM EDT SUNSET 641 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/2026-09-21 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.