Sunday, January 3, 2021

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

SUNDAY, JANUARY 3, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST WITH SOME OCEAN-EFFECT SNOW LATER ON
THIS MORNING….

Today we observed overcast skies with some light
between 11 A.M. and noontime. Only a trace of snow
was left, as the snow was very light at times.
Wind has been northeasterly and light, at an average
speed of a little under 10 mph. Visibility was the
highest at the 10 A.M. observation, reaching 75 miles
before the snow moved into the surrounding area. This
dropped the visibility to barely 30 miles by 1 P.M.

The highest temperature so far today is 32F, 3 degrees
lower than the normal high of 35F. The low since midnight
is 27F, 9 degrees above the normal minimum of 18F.

Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 28F; Dew Point: 23F; Relative Humidity: 82%
Wind: N at 4 kts, light and variable
Sea-level pressure: 30.14 in Hg; falling then rising
Visibility: 60 miles
6-hr Max temp: 28F
6-hr Min temp: 27F
24-hr Precip: 0.04 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 20 OVC 60 207/28/23/3604/014/ WND L/V/ 8/6//
70004 50003 10028 20027

10 A.M.
Weather: Overcast stratus
Temperature: 30F; Dew Point: 25F; Relative Humidity: 82%
Wind: NW at 5 kts, light
Sea-level pressure: 30.19 in Hg; steady, then rising
Visibility: 75 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 20 OVC 75 223/30/25/3305/019/ WND LGT/ 8/6// 53016

1 P.M.
Weather: Overcast stratus
Temperature: 32F, Dew point: 28F; Relative Humidity: 83%
Wind: NE at 7 kts
Sea-level pressure: 30.07 inches Hg, falling, then more
rapidly
Visibility: 30 miles, distant virga
6-hr Max temp: 32F
6-hr Min temp: 28F
6-hr Precip: Trace
6-hr Snow: Trace
Snow Depth: 0 ins.
BHO SA 1755 20 OVC 30 179/32/28/0507/007/ VIRGA ALQDS NEW SNW
PST 6 HRS TRACE/ 8/6// 58044 10032 20028

SUMMARY FOR SATURDAY, JANUARY 2, 2021

TEMPERATURE (DEGREES F)
MAX…….43   NORMAL…..35
MIN…….30   NORMAL…..19
MEAN……37   NORMAL…..27

DEPARTURE FROM 30-YEAR NORMAL…………………+10
TOTAL DEPARTURE FOR THE MONTH…………………+14 [+6.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………28  DEPARTURE……-10
TOTAL HEATING UNITS FOR THE MONTH……………62  DEPARTURE……-15
TOTAL HEATING UNITS FOR THE SEASON…………1992  DEPARTURE…..-389
TOTAL HEATING UNITS LAST SEASON TO DATE…….2309  DEPARTURE…..-317

PEAK WIND GUST FOR YESTERDAY (MPH):
420C/Official…………..37 WNW @  3:57 P.M.
AEROVANE (south tower)…..39 E   @  2:22 P.M.
ASOS…………………..37 NW  @  3:58 P.M.
DAVIS #1……………….39 N   @  3:57 P.M.
DAVIS #2 (south tower)…..38 NW  @  2:29 P.M.
RMY……………………44
VECTOR…………………47
MERLIN…………………43

FASTEST MILE FOR YESTERDAY:
CONTACTING/OFFICIAL………………………..28 NW  @  2:50 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….26 NW  @  2:50 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………29 NW  @  2:49 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………27 NW  @  2:29 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..26 NNW @  2:46 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..28     @  2:47 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…14.8 NW  [355 total miles] ASOS………………13.5     [325 total miles] DAVIS #1…………..14.6 N   [350 total miles] DAVIS #2…………..14.7 N   [353 total miles] RMY……………….14.1 N   [339 total miles] VECTOR…………….14.8     [347 total miles]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.04  DEPARTURE….-0.14
ASOS………….0.05
TOTAL PRECIPITATION FOR THE MONTH………….0.36  DEPARTURE….+0.07
ASOS………….0.37
TOTAL PRECIPITATION FOR THE YEAR…………..0.36  DEPARTURE….+0.07
ASOS…………0.37

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0  DEPARTURE…..-0.5
TOTAL SNOWFALL FOR THE MONTH……………… 0.3  DEPARTURE…..-0.8
TOTAL SNOWFALL FOR THE SEASON……………..26.5  DEPARTURE…..+9.4

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

12/01   62/40/51/+14/0.61/0.0/112/20      60 S    AERO 67 W    RMY 64
12/02   42/32/37/+1/0.00/0.0/301/54       32 SW   AERO 32 SW   RMY 35
12/03   49/30/40/+4/0.00/0.0/512/92       25 SSW  AERO 25 SSW  RMY 28
12/04   58/40/49/+14/0.06/0.0/332/60      35 SSW  AERO 35 SSW  RMY 37
12/05   42/32/37/+2/2.13/2.8/000/00       58 NNW  AERO 58 NNW  RMY 67
12/06   34/26/30/-5/0.01/T/403/73        E44 WNW  AERO 44 WNW  RMY 49
12/07   33/22/28/-6/T/T/…/..            24 NW   AERO 26 NW   RMY 26
12/08   29/22/26/-8/T/T/…/..            24 NW   AERO 25 NW   RMY 28
12/09   34/19/27/-7/T/T/…/..            16 W    AERO 17 W    RMY 19
12/10   42/30/36/+3/0.00/0.0/…/..       30 WNW  AERO 31 WNW  RMY 29
12/11   50/31/41/+8/0.00/0.0/…/..       32 SW   AERO 35 SW   RMY 34
12/12   48/40/44/+11/0.38/0.0/…/..      25 E    AERO 21 E    RMY 25
12/13   58/35/47/+15/0.00/0.0…/..       28 W    AERO 31 WSW  RMY 31
12/14   35/30/33/+1/0.10/0.4/…/..       25 N    AERO 25 N    RMY 29
12/15   34/21/28/-4/0.00/0.0/…/..       32 WNW  AERO 33 WNW  RMY 38
12/16   27/13/20/-11/0.14/1.4/…/..      38 E    AERO 37 E    RMY 39
12/17   31/19/25/-6/1.58/15.1/…/..      55 ENE  AERO 56 ENE  RMY 59
12/18   27/18/23/-8/0.00/0.0/…/..       28 N    AERO 26 N    RMY 27
12/19   29/13/21/-9/0.00/0.0/…/..       16 SW   AERO 16 S    RMY 16
12/20   36/24/30/0/0.02/T/…/..          14 S    AERO 16 SW   RMY 14
12/21   34/29/32/+2/0.00/0.0/…/..       22 WNW  AERO 24 WNW  RMY 23
12/22   42/30/36/+7/0.00/0.0/…/…      34 WNW  AERO 35 WNW  RMY 38
12/23   37/26/32/+3/0.00/0.0/…/..       30 WNW  AERO 28 WNW  RMY 31
12/24   53/30/42/+13/T/0.0/…/..         46 SSE  AERO 50 SSE  RMY 55
12/25   61/37/49/+21/2.15/0.0/…/..      68 SSE  AERO 77 SSE  RMY 84
12/26   37/25/31/+3/0.00/0.0/…/..       38 SW   AERO 44 SW   RMY 43
12/27   38/22/30/+2/0.00/0.0/…/..       18 W    AERO 18 W    RMY 20
12/28   49/27/38/+10/T/0.0/…/..         35 SSW  AERO 36 –    RMY 37
12/29   38/20/29/+2/0.00/0.0/…/..       48 WNW  AERO 50 WNW  RMY 56
12/30   40/19/30/+3/0.00/0.0/…/..       39 SW   AERO 41 SW   RMY 45
12/31   44/28/36/+9/0.14/0.0/…/..       38 SW   AERO 43 SW   RMY 43

PRELIMINARY CLIMATE SUMMARY FOR JANUARY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

01/01   36/25/31/+4/…./…/…/..       23 E    AERO 23 NNW  RMY 23
01/02   43/30/37/+10/…./…/…/..      37 WNW  AERO 39 WNW  RMY 44

01/03 The low since midnight is 27F, the daily normal low is 18F

DAILY RECORDS FOR DECEMBER 2020
12/17/20: DAILY RECORD SNOWFALL OF 15.1 INCHES,
BREAKS PREVIOUS RECORD OF 7.5 INCHES SET IN 1988

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

RECORDS FOR JANUARY 3
HIGH 64F IN 2000
LOW -4F IN 1904
PRECIP 1.93 INS. IN 1999
SNOW 11.3 INS. 1996
PEAK GUST 92 MPH S IN 1960

RECORDS FOR JANUARY 4
HIGH 60F IN 2000
LOW -8F IN 1904, 1981
PRECIP 1.79 INS. IN 1982
SNOW 16.5 INS. IN 2018
PEAK GUST 84 MPH S IN 1982

TODAY’S REPORT PREPARED BY: Benjamin Turner