Friday, October 1, 2021

| October 1, 2021 | Reply

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

FRIDAY, OCTOBER 1ST, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0542E
SUNSET:  1725E

A SPECTACULAR AUTUMN DAY ATOP GREAT BLUE HILL….

Morning low of 44F was good for the lowest since May 29th,
2021 – marking our 2nd “step-down” as we cool off towards
the winter solstice. Since bottoming out there in the mid-40s,
we are experiencing a spectacular autumn day consisting of mostly
sunny skies, temps rebounding into the low-60s, dew points in
the mid-40s, and benign winds. If it can’t be any more spectacular,
visibility has been a stunning 80 miles since our first morning
observation!

The high so far today is 64F, 3 degrees below the normal
max of 67F. The low since midnight is 44F, 6 degrees below
the normal low of 50F.


Today’s Observations:

7 A.M.
Weather: Clear
Temperature: 46F; Dew Point: 43F; Relative Humidity: 88%
Wind: NW @ 9G11 kts
Sea-level pressure: 1021.9 mb; 30.18 in. Hg: rising, then rising more rapidly
Visibility: 80 miles  
6-hr Max temp: 46F
6-hr Min temp: 44F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 80 219/46/43/3109G11/018/ 8/000 53012 10046 20044

10 A.M.
Weather: Clear (few cumulus all quads)
Temperature: 59F; Dew Point: 46F; Relative Humidity: 62%
Wind: NNW @ 10G16 kts
Sea-level pressure: 1021.8 mb; 30.17 in Hg; rising then falling
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 80 218/59/46/3310G16/017/ FEW CU ALQDS/ 8/100 58001

1 P.M.
Weather: Scattered Cumulus
Temperature: 62F, Dew point: 44F; Relative Humidity: 51%
Wind: WNW @ 10G17 kts
Sea-level pressure: 1020.9 mb; 30.15 in Hg; rising then falling
Visibility: 80 miles
6-hr Max temp: 60F
6-hr Min temp: 49F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 80 209/62/44/2910G17/015/ 8/100 58009 10064 20046

SUMMARY FOR THURSDAY, SEPTEMBER 30, 2021

TEMPERATURE (DEGREES F)
MAX…….60     NORMAL…..67
MIN…….46     NORMAL…..50
MEAN……53     NORMAL…..59

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………. -6
TOTAL DEPARTURE FOR THE MONTH…………………….+40 [+1.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………12  DEPARTURE……..+5
TOTAL HEATING UNITS FOR THE MONTH……………46  DEPARTURE…….-54
TOTAL HEATING UNITS FOR THE SEASON…………..74  DEPARTURE…….-44
TOTAL HEATING UNITS LAST SEASON TO DATE………98  DEPARTURE…….-24

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………62  DEPARTURE…….-12
TOTAL COOLING UNITS FOR THE SEASON………….712  DEPARTURE…….+42
TOTAL COOLING UNITS LAST SEASON TO DATE……..830  DEPARTURE……-118

PEAK WIND GUST (MPH):
                     Official……………….22 NNW @ 12:36 P.M.
                     AEROVANE (south tower)…..21 NNW @ 12:36 P.M.
                     VECTOR #2 (south tower)….23     @ 12:36 P.M.
                     DAVIS #2 (south tower)…..20 NNW @ 12:36 P.M.
                     ASOS………..OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
                     RMY…………OUT OF SERVICE D/T RENOVATIONS  
                     MERLIN………OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 NW   @  2:19 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15      @  2:19 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 NW   @  2:19 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY AVERAGE……..OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……..8.8 NW [210 total miles]
                     VECTOR #2………………9.4
                     DAVIS #2……………….9.1 NNW
                     RMY……………..OUT OF SERVICE D/T RENOVATIONS
                     ASOS…………….OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS   

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00  DEPARTURE….-0.16
TOTAL PRECIPITATION FOR THE MONTH………….6.64  DEPARTURE….+2.58
TOTAL PRECIPITATION FOR THE YEAR………….46.98  DEPARTURE….+8.57

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

09/01   68/56/62/-7/1.47/000/00          34 NNE AERO 37 NNE RMY N/A    
09/02   71/55/63/-6/2.53/322/41          49 ENE AERO 52 ENE RMY N/A
09/03   72/52/62/-6/0.00/735/94          23 NW  AERO 23 NW  RMY N/A
09/04   76/55/66/-2/0.00/757/97          22 WNW AERO 21 WNW RMY N/A
09/05   72/60/66/-2/0.04/008/01          27 S   AERO 29 S   RMY N/A
09/06   80/61/71/+3/0.00/557/72          24 WNW AERO 25 WNW RMY N/A
09/07   78/57/68/+1/0.00/732/95          23 WSW AERO 22 WSW RMY N/A
09/08   81/61/71/+4/0.00/646/84          43 S   AERO 45 S   RMY N/A
09/09   71/64/68/+1/0.90/000/00          33 S   AERO 36 S   RMY N/A
09/10   74/55/65/-1/0.04/595/78          31 NW  AERO 32 WNW RMY N/A
09/11   75/51/63/-3/0.00/730/96          24 SW  AERO 24 SW  RMY N/A
09/12   79/60/70/+4/0.00/591/78          33 SW  AERO 32 SW  RMY N/A
09/13   77/62/70/+5/0.06/559/74          22 NW  AERO 23 NW  RMY N/A
09/14   75/59/67/+2/0.00/444/59          23 S   AERO 25 S   RMY N/A
09/15   82/65/74/+9/T/539/72             32 SSW AERO 35 SSW RMY N/A
09/16   69/61/65/+1/0.27/037/05          24 ENE AERO 24 ENE RMY N/A TSTM      
09/17   66/60/63/-1/0.02/000/00          22 NE  AERO 23 NE  RMY N/A
09/18   74/62/68/+5/0.04/207/28          17 WNW AERO 18 WNW RMY N/A TSTM
09/19   71/57/64/+1/0.15/619/84          23 NNE AERO 24 NNE RMY N/A
09/20   71/55/63/0/0.00/588/80           20 SE  AERO 20 SE  RMY N/A
09/21   75/55/65/+3/0.00/…/..          19 SSE AERO 20 SSE RMY N/A
09/22   75/65/70/+8/0.02/…/..          30 S   AERO 30 S   RMY N/A
09/23   78/65/72/+10/0.08/…/..         36 SSE AERO 37 SSE RMY N/A
09/24   75/62/69/+8/0.02/…/..          43 SSE AERO 45 SSE RMY N/A
09/25   74/59/67/+6/0.02/…/..          14 N   AERO 14 NNW RMY N/A
09/26   73/54/64/+4/0.57/…/..          33 WNW AERO 32 WNW RMY N/A
09/27   73/52/63/+3/T/…/..             30 SW  AERO 30 SW  RMY N/A
09/28   67/52/60/+1/0.40/…/..          27 SSW AERO 25 SSW RMY N/A TSTM
09/29   63/45/54/-5/0.00/…/..          25 NNW AERO 25 NNW RMY N/A
09/30   60/46/53/-6/…/…/..           22 NNW AERO 21 NNW RMY N/A

10/01   The low since midnight is 44F, the daily normal low is 50F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR OCTOBER 1
HIGH 85F IN 1927
LOW 30F IN 1992
PRECIP 1.63 INCHES IN 2014
PEAK GUST 68e MPH SSE IN 1977

RECORDS FOR OCTOBER 2
HIGH 85F IN 1968
LOW 29F IN 1899
PRECIP 1.75 INCHES IN 1984
PEAK GUST 52e MPH S IN 1952, 52 NNW IN 1984

TODAY’S REPORT PREPARED BY: Andrew Swanson

Category: Daily Discussions

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