Friday, October 1, 2021
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
