Wednesday, September 29, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, SEPTEMBER 29, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0539E
SUNSET: 1729E
PARTLY CLOUDY AND COOL WITH GREAT VISIBILITY….
Today consisted of cool, fall-like weather with an average visibility
of 80 miles. Wind was northerly and light with an average speed of
less than 10 mph. Cloud cover increased around noontime, covering up
more than half of the sky.
Rainfall yesterday afternoon totaled 0.40 inches, increasing the
monthly total to 6.63 inches. This is an almost 3 inch surplus to
end off the month. The annual total is 46.97 inches, almost 9 inches
above normal.
Today was dry with dew points in the mid 40’s. This makes for a
nice fall day.
The high so far today is 61F, 7 degrees below the normal max of 68F.
The low since midnight is 45F, 6 degrees below the normal low of 51F.
Today’s Observations:
7 A.M.
Weather: Scattered cirrostratus, few cumulus
Temperature: 46F; Dew Point: 45F; Relative Humidity: 95%
Wind: N @ 8 kts
Sea-level pressure: 1013.1 mb; 29.92 in. Hg; rising unsteadily
Visibility: 75 miles
6-hr Max temp: 51F
6-hr Min temp: 45F
24-hr Precip: 0.40 ins.
BHO SA 1155 250 SCT 75 131/46/45/0108/992/ FEW CU ALQDS/ 8/105 52013
70040 10051 20045
10 A.M.
Weather: Scattered stratocumulus and cirrostratus
Temperature: 58F; Dew Point: 46F; Relative Humidity: 65%
Wind: NNE @ 8G14 kts
Sea-level pressure: 1013.5 mb; 29.93 in Hg; rising then falling
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 55 SCT 250 SCT 80 135/58/46/0208G14/993/ 8/105 50004
1 P.M.
Weather: Broken cumulus
Temperature: 58F, Dew point: 46F; Relative Humidity: 65%
Wind: N @ 6 kts, Wind Light
Sea-level pressure: 1012.9 mb; 29.91 in Hg; falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 61F
6-hr Min temp: 46F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 BKN 80 129/58/46/3506/991/ WND LGT/ 8/200 58006
10061 20046
SUMMARY FOR TUESDAY, SEPTEMBER 28, 2021
TEMPERATURE (DEGREES F)
MAX…….67 NORMAL…..68
MIN…….52 NORMAL…..51
MEAN……60 NORMAL…..59
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………. +1
TOTAL DEPARTURE FOR THE MONTH…………………….+51 [+1.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….5 DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH……………23 DEPARTURE…….-63
TOTAL HEATING UNITS FOR THE SEASON…………..51 DEPARTURE…….-53
TOTAL HEATING UNITS LAST SEASON TO DATE………97 DEPARTURE…….-46
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…….-11
TOTAL COOLING UNITS FOR THE SEASON………….712 DEPARTURE…….+43
TOTAL COOLING UNITS LAST SEASON TO DATE……..826 DEPARTURE……-114
PEAK WIND GUST (MPH):
Official……………….27 SSW @ 12:08 A.M.
AEROVANE (south tower)…..25 SSW @ 12:09 A.M.
VECTOR #2 (south tower)….28 @ 12:08 A.M.
DAVIS #2 (south tower)…..26 SW @ 12:05 A.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………………20 SSW @ 12:11 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 @ 12:08 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 SW @ 12:09 A.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……..9.1 SSW [219 total miles]
VECTOR #2……………..10.0
DAVIS #2……………….9.7 WSW
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…….0.40 DEPARTURE….+0.25
TOTAL PRECIPITATION FOR THE MONTH………….6.63 DEPARTURE….+2.88
TOTAL PRECIPITATION FOR THE YEAR………….46.97 DEPARTURE….+8.87
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 The low since midnight is 45F, the daily normal low is 51F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 28
HIGH 86F IN 2014
LOW 33F IN 1897,1947
PRECIP 2.46 INCHES IN 2004
PEAK GUST 69 MPH NE IN 1962
RECORDS FOR SEPTEMBER 29
HIGH 85F IN 1952
LOW 28F IN 1914 (SEPTEMBER MINIMUM RECORD)
PRECIP 2.61 INCHES IN 1907
PEAK GUST 62 MPH S IN 2005
TODAY’S REPORT PREPARED BY: Benjamin Turner
