Saturday, September 25, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, SEPTEMBER 25, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0535E
SUNSET: 1736E
PARTLY CLOUDY WITH GREAT VISIBILITY FROM THE SUMMIT….
Wind is much lower in comparison to yesterday, with an average
speed of 5 mph from the east. It was a very nice weather day,
with an average visibility of 80 miles! Skies are partly cloudy,
and dew points are in the mid 50’s. This makes for some good
hiking weather.
The high so far today is 73F, 4 degrees above the normal max of
69F. The low since midnight is 59F, 7 degrees above the
normal low of 52F.
Today’s Observations:
7 A.M.
Weather: Scattered stratocumlus, broken altocumulus
Temperature: 60F; Dew Point: 56F; Relative Humidity: 86%
Wind: N @ 8 kts
Sea-level pressure: 1017.7 mb; 30.05 in. Hg; steady, then rising
Visibility: 85 miles
6-hr Max temp: 61F
6-hr Min temp: 59F
24-hr Precip: 0.01 ins.
BHO SA 1155 50 SCT 65 BKN 85 177/60/56/0108/005/ 8/550 51002 70001
10061 20059
10 A.M.
Weather: Scattered stratocumulus, broken altocumulus
Temperature: 68F; Dew Point: 55F; Relative Humidity: 63%
Wind: N @ 3 kts, light and variable
Sea-level pressure: 1017.2 mb; 30.04 in Hg; steady then falling
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 50 SCT 70 BKN 80 172/68/55/0203/004/ WND L/V/ 8/550
58005
1 P.M.
Weather: Scattered stratocumulus, altocumulus
Temperature: 73F, Dew point: 55F; Relative Humidity: 53%
Wind: E @ 6 kts, wind light
Sea-level pressure: 1015.4 mb; 29.98 in Hg; falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 73F
6-hr Min temp: 60F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT 70 SCT 80 154/73/55/0906/998/ WND LGT/ 8/550 58018
10073 20060
SUMMARY FOR FRIDAY, SEPTEMBER 24, 2021
TEMPERATURE (DEGREES F)
MAX…….75 NORMAL…..70
MIN…….62 NORMAL…..53
MEAN……69 NORMAL…..61
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+8
TOTAL DEPARTURE FOR THE MONTH…………………….+37 [+1.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH……………15 DEPARTURE…….-47
TOTAL HEATING UNITS FOR THE SEASON…………..43 DEPARTURE…….-37
TOTAL HEATING UNITS LAST SEASON TO DATE………97 DEPARTURE…….-54
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….4 DEPARTURE……..+3
TOTAL COOLING UNITS FOR THE MONTH……………60 DEPARTURE……..-9
TOTAL COOLING UNITS FOR THE SEASON………….710 DEPARTURE…….+45
TOTAL COOLING UNITS LAST SEASON TO DATE……..809 DEPARTURE…….-99
PEAK WIND GUST (MPH):
Official……………….43 SSE @ 8:30 A.M.
AEROVANE (south tower)…..45 SSE @ 8:30 A.M.
VECTOR #2 (south tower)….48 @ 8:31 A.M.
DAVIS #2 (south tower)…..57 S @ 8:31 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………………29 SSE @ 9:01 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..26 @ 9:01 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………30 S @ 9:01 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…….15.2 SSE [365 total miles]
VECTOR #2……………..15.4
DAVIS #2………………15.4 S
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…….0.01 DEPARTURE….-0.13
TOTAL PRECIPITATION FOR THE MONTH………….5.64 DEPARTURE….+2.49
TOTAL PRECIPITATION FOR THE YEAR………….45.98 DEPARTURE….+8.48
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 The low since midnight is 59F, 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 25
HIGH 87F IN 1970
LOW 31F IN 1950
PRECIP 2.68 INCHES IN 1961
PEAK GUST 63 MPH SSW IN 1991
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
TODAY’S REPORT PREPARED BY: Benjamin Turner
