Monday, September 27, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, SEPTEMBER 27, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0537E
SUNSET: 1732E
CLOUDS INCREASING, BUT PLEASANTLY DRY AND MILD AIR….
Plenty of sunshine this morning has given way to increasing clouds
as a weak disturbance moves through the region today. A few showers
are showing up on radar, but the trend has been for it to dry up
as it moves toward coastal Massachusetts, nonetheless, a few
sprinkles have managed to fall here on the summit between 12-1 P.M.
Wind has been generally on the light side today averaging around
10 mph. A few gusts have reached upwards to 20 mph.
Visibility has been decreasing as would be expected with a band of
showers moving in from the west. We started the day being able to
see around 70 miles, but has decreased to around 50 miles early
this afternoon.
The high so far today is 72F, 4 degrees above the normal max of
68F. The low since midnight is 52F, 1 degree above the
normal low of 51F.
Today’s Observations:
7 A.M.
Weather: Scattered altocumulus, thin scattered cirrus
Temperature: 56F; Dew Point: 46F; Relative Humidity: 69%
Wind: WSW @ 9 kts
Sea-level pressure: 1014.1 mb; 29.95 in. Hg; rising, then more rapidly
Visibility: 70 miles
6-hr Max temp: 56F
6-hr Min temp: 52F
24-hr Precip: 0.00 ins.
BHO SA 1155 120 SCT 250 -SCT 70 141/56/46/2409/995/ 8/071 53007 10056 20052
10 A.M.
Weather: Thin scattered cirrus, few altocumulus all quadrants
Temperature: 68F; Dew Point: 52F; Relative Humidity: 56%
Wind: SW @ 9 kts
Sea-level pressure: 1013.4 mb; 29.93 in Hg; steady then falling
Visibility: 50 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 -SCT 300 -SCT 50 134/68/56/2309/993/ FEW AC ALQDS/
8/071 58007
1 P.M.
Weather: Scattered altocumulus, scattered cirrostratus, thin broken cirrus
Temperature: 70F, Dew point: 56F; Relative Humidity: 61%
Wind: SW @ 9G15 kts
Sea-level pressure: 1011.3 mb; 29.86 in Hg; falling, then more rapidly
Visibility: 50 miles
6-hr Max temp: 72F
6-hr Min temp: 56F
6-hr Precip: Trace
BHO SA 1755 100 SCT 220 SCT 250 -BKN 50 113/70/56/2209G15/986/
RW-B37E48/ 8/078 58021 6000/ 10072 20056
SUMMARY FOR SUNDAY, SEPTEMBER 26, 2021
TEMPERATURE (DEGREES F)
MAX…….73 NORMAL…..69
MIN…….54 NORMAL…..52
MEAN……64 NORMAL…..60
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………. +4
TOTAL DEPARTURE FOR THE MONTH…………………….+47 [+1.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….1 DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH……………16 DEPARTURE…….-57
TOTAL HEATING UNITS FOR THE SEASON…………..44 DEPARTURE…….-47
TOTAL HEATING UNITS LAST SEASON TO DATE………97 DEPARTURE…….-53
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……..-9
TOTAL COOLING UNITS FOR THE SEASON………….712 DEPARTURE…….+45
TOTAL COOLING UNITS LAST SEASON TO DATE……..813 DEPARTURE……-101
PEAK WIND GUST (MPH):
Official……………….33 WNW @ 4:01 P.M.
AEROVANE (south tower)…..32 WNW @ 4:02 P.M.
VECTOR #2 (south tower)….36 @ 4:01 P.M.
DAVIS #2 (south tower)…..30 WNW @ 4:02 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………………23 WNW @ 2:56 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 @ 4:02 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 WNW @ 4:02 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…….10.8 WNW [259 total miles]
VECTOR #2…………….. N/A
DAVIS #2………………11.4 NW
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….-0.14
TOTAL PRECIPITATION FOR THE MONTH………….6.23 DEPARTURE….+2.78
TOTAL PRECIPITATION FOR THE YEAR………….46.57 DEPARTURE….+8.77
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 The low since midnight is 52F, 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 27
HIGH 86F IN 2017
LOW 32F IN 1947
PRECIP 2.26 INCHES IN 1962
PEAK GUST 100 MPH SSE IN 1985 (HURRICANE GLORIA)
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
TODAY’S REPORT PREPARED BY: Matt Douglas
