NWS CLI archive · settlement source
CLIBOS · 보스턴 · America/New_York · ← 2026-09-19 · 2026-09-21 → · All dates for KBOS · JSON · METAR-derived record
Final issued 2026-09-21 01:26:00 EDT · Product id iem:CDUS41-KBOX-210526:BOS:2026-09-20:final · IEM archive
Product id iem:CDUS41-KBOX-210526:BOS:2026-09-20:final · iem-afos · IEM archive
SHA-256 f4a746d0d952ab82bc5b366344dead75e19d2e109406932c395c6f2618e77fe8
Product text
CDUS41 KBOX 210526
CLIBOS
CLIMATE REPORT
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
126 AM EDT MON SEP 21 2026
...................................
...THE BOSTON MA CLIMATE SUMMARY FOR SEPTEMBER 20 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 63 348 PM 97 1983 72 -9 65
MINIMUM 55 217 AM 42 1929 57 -2 54
1964
1979
AVERAGE 59 64 -5 60
PRECIPITATION (IN)
YESTERDAY 0.10 2.82 1899 0.13 -0.03 0.00
MONTH TO DATE 1.80 2.28 -0.48 1.55
SINCE SEP 1 1.80 2.28 -0.48 1.55
SINCE JAN 1 19.36 30.32 -10.96 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 6 3 3 5
MONTH TO DATE 20 28 -8 23
SINCE SEP 1 20 28 -8 23
SINCE JUL 1 20 37 -17 30
COOLING
YESTERDAY 0 2 -2 0
MONTH TO DATE 77 76 1 45
SINCE SEP 1 77 76 1 45
SINCE JAN 1 994 776 218 802
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 7 RESULTANT WIND DIRECTION SE (140)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION SE (140)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION SE (140)
AVERAGE WIND SPEED 7.7
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 1.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 1100 PM
LOWEST 64 200 AM
AVERAGE 82
..........................................................
THE BOSTON MA CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 71 94 1895
MINIMUM TEMPERATURE (F) 56 40 1904
1929
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.
$$Product id iem:CDUS41-KBOX-202122:BOS:2026-09-20:interim · iem-afos · IEM archive
SHA-256 a105a6946df9f49fe9c5857988ebe2e861608002b2801a353061e5f99eb2d3c7
Product text
CDUS41 KBOX 202122
CLIBOS
CLIMATE REPORT
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
522 PM EDT SUN SEP 20 2026
...................................
...THE BOSTON MA CLIMATE SUMMARY FOR SEPTEMBER 20 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 63 348 PM 97 1983 72 -9 65
MINIMUM 55 217 AM 42 1929 57 -2 54
1964
1979
AVERAGE 59 64 -5 60
PRECIPITATION (IN)
TODAY T 2.82 1899 0.13 -0.13 0.00
MONTH TO DATE 1.70 2.28 -0.58 1.55
SINCE SEP 1 1.70 2.28 -0.58 1.55
SINCE JAN 1 19.26 30.32 -11.06 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 6 3 3 5
MONTH TO DATE 20 28 -8 23
SINCE SEP 1 20 28 -8 23
SINCE JUL 1 20 37 -17 30
COOLING
TODAY 0 2 -2 0
MONTH TO DATE 77 76 1 45
SINCE SEP 1 77 76 1 45
SINCE JAN 1 994 776 218 802
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION SE (150)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION SE (140)
AVERAGE WIND SPEED 8.1
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 78 300 PM
LOWEST 64 200 AM
AVERAGE 71
..........................................................
THE BOSTON MA CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 71 94 1895
MINIMUM TEMPERATURE (F) 56 40 1904
1929
SUNRISE AND SUNSET
SEPTEMBER 20 2026.....SUNRISE 629 AM EDT SUNSET 645 PM EDT
SEPTEMBER 21 2026.....SUNRISE 630 AM EDT SUNSET 643 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/2026-09-20 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.