Sunday, September 26, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, SEPTEMBER 26, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0536E
SUNSET: 1734E
PARTLY CLOUDY WITH GREAT VISIBILITY FROM THE SUMMIT….
Today started off foggy with only a 1/16th mile visibility at
the 7 A.M. observation. This was following overnight rainfall
that left 0.59 inches in the gauge. Weather cleared up rather
quickly, and we observed an excellent visibility of 80 miles at
1 P.M. Temps are hanging in the low 70’s with dew points dropping
to the mid 50’s. Some really good weather for a hike.
The high so far today is 72F, 4 degrees above the normal max of
69F. The low since midnight is 60F, 8 degrees above the
normal low of 52F.
Today’s Observations:
7 A.M.
Weather: Fog, vertical visibility 200 feet
Temperature: 60F; Dew Point: 60F; Relative Humidity: 86%
Wind: NNW @ 5 kts, wind light
Sea-level pressure: 1008.1 mb; 29.77 in. Hg; rising then falling
Visibility: 1/16 mile, fog
6-hr Max temp: 62F
6-hr Min temp: 60F
24-hr Precip: 0.59 ins.
BHO SA 1155 X W2 1/16F 081/60/60/3405/977/ WND LGT/ 8//// 55005
70059 10062 20060
10 A.M.
Weather: Scattered altocumulus and cirrus, few cumulus
Temperature: 65F; Dew Point: 61F; Relative Humidity: 86%
Wind: WNW @ 10G16 kts
Sea-level pressure: 1008.5 mb; 29.78 in Hg; rising then falling
Visibility: 65 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 70 SCT 250 SCT 65 085/65/61/3010G16/978/ FEW CU ALQDS/
8/181 50004
1 P.M.
Weather: Scattered cumulus
Temperature: 71F, Dew point: 56F; Relative Humidity: 58%
Wind: WNW @ 11G16 kts
Sea-level pressure: 1007.4 mb; 29.75 in Hg; falling, then more slowly
Visibility: 80 miles
6-hr Max temp: 72F
6-hr Min temp: 60F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT 80 074/71/56/3011G16/975/ 8/200 56011 10072 20060
SUMMARY FOR SATURDAY, SEPTEMBER 25, 2021
TEMPERATURE (DEGREES F)
MAX…….74 NORMAL…..69
MIN…….59 NORMAL…..52
MEAN……67 NORMAL…..61
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+6
TOTAL DEPARTURE FOR THE MONTH…………………….+43 [+1.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE MONTH……………15 DEPARTURE…….-53
TOTAL HEATING UNITS FOR THE SEASON…………..43 DEPARTURE…….-43
TOTAL HEATING UNITS LAST SEASON TO DATE………97 DEPARTURE…….-54
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….2 DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE MONTH……………62 DEPARTURE……..-8
TOTAL COOLING UNITS FOR THE SEASON………….712 DEPARTURE…….+46
TOTAL COOLING UNITS LAST SEASON TO DATE……..811 DEPARTURE…….-99
PEAK WIND GUST (MPH):
Official……………….15 N @ 6:36 A.M.
AEROVANE (south tower)…..14 NNW @ 2:33 A.M.
VECTOR #2 (south tower)….15 @ 6:36 A.M.
DAVIS #2 (south tower)…..13 N @ 2:17 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………………11 NNW @ 2:24 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..12 @ 2:32 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………11 NNE @ 3:32 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…….5.5 NE [132 total miles]
VECTOR #2……………..6.1
DAVIS #2………………6.5 NE
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…….0.59 DEPARTURE….+0.43
TOTAL PRECIPITATION FOR THE MONTH………….6.23 DEPARTURE….+2.92
TOTAL PRECIPITATION FOR THE YEAR………….46.57 DEPARTURE….+8.91
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/…/.. 24 WNW AERO 25 WNW RMY N/A
09/07 78/57/68/+1/0.00/…/.. 23 WSW AERO 22 WSW RMY N/A
09/08 81/61/71/+4/0.00/…/.. 43 S AERO 45 S RMY N/A
09/09 71/64/68/+1/0.90/…/.. 33 S AERO 36 S RMY N/A
09/10 74/55/65/-1/0.04/…/.. 31 NW AERO 32 WNW RMY N/A
09/11 75/51/63/-3/0.00/…/.. 24 SW AERO 24 SW RMY N/A
09/12 79/60/70/+4/0.00/…/.. 33 SW AERO 32 SW RMY N/A
09/13 77/62/70/+5/0.06/…/.. 22 NW AERO 23 NW RMY N/A
09/14 75/59/67/+2/0.00/…/.. 23 S AERO 25 S RMY N/A
09/15 82/65/74/+9/T/…/.. 32 SSW AERO 35 SSW RMY N/A
09/16 69/61/65/+1/0.27/…/.. 24 ENE AERO 24 ENE RMY N/A TSTM
09/17 66/60/63/-1/0.02/…/.. 22 NE AERO 23 NE RMY N/A
09/18 74/62/68/+5/0.04/…/.. 17 WNW AERO 18 WNW RMY N/A TSTM
09/19 71/57/64/+1/0.15/…/.. 23 NNE AERO 24 NNE RMY N/A
09/20 71/55/63/0/0.00/…/.. 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/…./…/.. 30 S AERO 30 S RMY N/A
09/23 78/65/72/+10/…./…/.. 36 SSE AERO 37 SSE RMY N/A
09/24 75/62/69/+8/…./…/.. 43 SSE AERO 45 SSE RMY N/A
09/25 74/59/67/+6/…./…/.. 14 N AERO 14 NNW RMY N/A
09/26 The low since midnight is 60F, the daily normal low is 52F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 26
HIGH 91F IN 2007
LOW 36F IN 1905,1922,1978
PRECIP 3.84 INCHES IN 1888
PEAK GUST 54e MPH S IN 1977
RECORDS FOR SEPTEMBER 27
HIGH 86F IN 2017
LOW 32F IN 1947
PRECIP 2.26 INCHES IN 1962
PEAK GUST 100 MPH SSE IN 1985 (HURRICANE GLORIA)
TODAY’S REPORT PREPARED BY: Benjamin Turner
