Sunday, October 17, 2021

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

SUNDAY, OCTOBER 17, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0600E
SUNSET:  1659E

COOL AND BREEZY WITH FAIR WEATHER FOLLOWING SOME
OVERNIGHT RAINFALL….

Today was partly cloudy with an average visibility of 75 miles.
This was after overnight rain left 0.31 inches in the gauge
after a dry streak. Areas in southeastern Massachusetts received
much more in the way of rainfall.

Conditions are breezy with an average wind speed of around 15 mph
and a max gust of 26 mph. Wind has been northwesterly and cool
all day.

The high so far today is 62F, a degree above the normal max of
61F. The low since midnight is 50F, 6 degrees above the normal
low of 44F.


Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus
Temperature: 50F; Dew Point: 48F; Relative Humidity: 93%
Wind: WNW @ 11G17 kts
Sea-level pressure: 1004.8 mb; 29.67 in. Hg: rising then steady
Visibility: 80 miles
6-hr Max temp: 57F
6-hr Min temp: 50F
24-hr Precip: 0.31 ins.
BHO SA 1155 CLR 80 048/50/48/3011G17/967/ FEW SC ALQDS/ 8/800
53007 70031 10057 20050

10 A.M.
Weather: Clear, few cumulus, altocumulus, and cirrostratus
Temperature: 57F; Dew Point: 48F; Relative Humidity: 71%
Wind: WNW @ 14G24 kts
Sea-level pressure: 1005.1 mb; 29.68 in Hg; rising, then more
slowly
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 75 051/57/48/2914G24/968/ FEW CU/AC/CS ALQDS/
8/188 51003

1 P.M.
Weather: Scattered cumulus and cirrostratus
Temperature: 60F, Dew point: 44F; Relative Humidity: 55%
Wind: NW @ 10G19 kts  
Sea-level pressure: 1004.1 mb; 29.65 in Hg; falling unsteadily
Visibility: 80 miles
6-hr Max temp: 62F
6-hr Min temp: 50F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT 250 SCT 80 041/60/44/3110G19/965/ 8/105 57010 10062
20050

SUMMARY FOR SATURDAY, OCTOBER 16, 2021

TEMPERATURE (DEGREES F)
MAX…….73     NORMAL…..61
MIN…….59     NORMAL…..44
MEAN……66     NORMAL…..52

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+14
TOTAL DEPARTURE FOR THE MONTH……………………..+89 [+5.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE…….-13
TOTAL HEATING UNITS FOR THE MONTH……………70  DEPARTURE…….-92
TOTAL HEATING UNITS FOR THE SEASON………….144  DEPARTURE……-136
TOTAL HEATING UNITS LAST SEASON TO DATE……..217  DEPARTURE…….-84

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….1  DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE MONTH…………….3  DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE SEASON………….717  DEPARTURE…….+41
TOTAL COOLING UNITS LAST SEASON TO DATE……..831  DEPARTURE……-114

PEAK WIND GUST (MPH):
                     Official……………….43 S   @  7:33 P.M.
                     AEROVANE (south tower)…..50 S   @  3:20 P.M.
                     VECTOR #2 (south tower)….53     @  1:29 P.M.
                     DAVIS #2 (south tower)…..46 S   @  1:29 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………………34 S   @  2:34 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..32     @  2:39 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………32 S   @  7:35 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……..19.1 S [459 total miles]
                     VECTOR #2………………19.3
                     DAVIS #2……………….19.3 SSW
                     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…….0.31  DEPARTURE….+0.13
TOTAL PRECIPITATION FOR THE MONTH………….2.41  DEPARTURE….-0.32
TOTAL PRECIPITATION FOR THE YEAR………….49.39  DEPARTURE….+8.25

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/01   64/44/54/-4/0.00/…/..          20 WNW AERO 20 WNW RMY N/A
10/02   73/47/60/+2/0.00/…/..          24 WSW AERO 23 WSW RMY N/A
10/03   65/55/60/+3/0.09/…/..          19 E   AERO 19 E   RMY N/A
10/04   59/51/55/-2/1.69/…/..          30 E   AERO 30 E   RMY N/A
10/05   58/50/54/-3/0.30/…/..          22 NNE AERO 23 NE  RMY N/A
10/06   69/50/60/+4/0.00/…/..          15 N   AERO 16 N   RMY N/A
10/07   73/55/64/+8/0.00/…/..          15 WSW AERO 15 W   RMY N/A
10/08   69/55/62/+7/T/…/..             24 ENE AERO 23 ENE RMY N/A
10/09   62/54/58/+3/0.01/…/..          23 E   AERO 23 E   RMY N/A
10/10   62/54/58/+3/T/…/..             22 E   AERO 21 E   RMY N/A
10/11   67/56/62/+8/0.01/…/..          20 NE  AERO 21 NE  RMY N/A
10/12   72/54/63/+9/0.00/…/..          15 SW  AERO 15 SW  RMY N/A
10/13   75/55/65/+11/0.00/…/..         18 SW  AERO 18 SW  RMY N/A
10/14   73/56/65/+12/0.00/…/..         19 N   AERO 20 N   RMY N/A
10/15   74/55/67/+14/0.00/…/..         24 S   AERO 24 SSW RMY N/A
10/16   73/59/66/+14/…./…/..         43 S   AERO 50 S   RMY 44

10/17   The low since midnight is 50F, the daily normal low is 44F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR OCTOBER 17
HIGH 86F IN 1947
LOW 25F IN 1886
PRECIP 1.87 INCHES IN 1989
SNOWFALL TRACE IN 1970
PEAK GUST 61 MPH E IN 2019

RECORDS FOR OCTOBER 18
HIGH 82F IN 1908
LOW 26F IN 1939
PRECIP 2.79 INCHES IN 1975
SNOWFALL 3.0 INCHES IN 2009
PEAK GUST 66 MPH S IN 1967

TODAY’S REPORT PREPARED BY: Benjamin Turner