Saturday, January 2, 2021

| January 2, 2021 | Reply

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

SATURDAY, JANUARY 2, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME

WARMER TEMPERATURES AND INCREASED WINDS WITH MORNING RAIN AND FOG…

This morning, temperatures rose to 41F at the 7:00 A.M. EST observation, which was 15F above what it was at the same time yesterday morning (26F). However, the temperature did not go much higher by 1:00 P.M.. A maximum of 42F was reached so far for today, which is 7F above the normal temperature for this time of year of 35F. This warmer air was brought in with a low pressure system, which also gave us increased winds today. The peak gust so far was 35 MPH out of the east at 6:29 A.M. this morning.

Last night and into early this morning, temperatures were still cold enough to bring some frozen precipitation to the region in the form of snow and sleet. An estimated 0.3 ins. of frozen precipitation fell at Great Blue Hill, but it melted soon after. Rain continued to fall overnight until shortly after the 10:00 A.M. observation. This storm gave us a total of 0.36 ins. of liquid precipitation.

Visibility was poor to start the day with the rain, drizzle, and fog. At 10:00 A.M., a few minutes before the rain stopped, visibility was only 1/8 of a mile and the sky was obscured by fog. However, over the next few hours, the fog lifted and the sun began to shine through breaks in the clouds. By 1:00 P.M., the visibility dramatically increased to 60 miles.

Today’s Observations:

7 A.M.
Weather: Drizzle, overcast stratus
Temperature: 41F; Dew Point: 41F; Relative Humidity: 100%
Wind: E at 18G32 kts,
Peak wind: 35 MPH E at 6:29 A.M.
Sea-level pressure: 29.70 in Hg; pressure falling rapidly
Visibility: 1 1/2 miles, fog
6-hr Max temp: 41F
6-hr Min temp: 35F
24-hr Precip: 0.32 ins.
24-hr Snow: 0.3 ins.
Snow Depth: 0 ins.
BHO SA 1155 E2 OVC 1 1/2LF 058/41/41/0918G32/970/ PRESFR PK WND 0935/29/ TOTAL NEW SNW PST 24 HRS 0.3 INS/ 8/6// 56076 70032 10041 20035

10 A.M.
Weather: Very light rain, fog
Temperature: 41F; Dew Point: 41F; Relative Humidity: 100%
Wind: NW at 10 kts
Sea-level pressure: 29.61 in Hg; falling, then falling more slowly
Visibility: 1/8 mile
3-hr Precip: 0.04 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 X W3 1/8R-F 028/41/41/3210/961/ PCPN VRY LGT/ 8//// 56030 6004/

1 P.M.
Weather: Broken stratocumulus
Temperature: 40F, Dew point: 39F; Relative Humidity: 94%
Wind: WNW at 10G23 kts
Sea-level pressure: 29.74 inches Hg, steady, then increasing
Visibility: 60 miles
6-hr Max temp: 42F
6-hr Min temp: 37F
6-hr Precip: 0.04 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 10 BKN 60 071/40/39/3010G23/974/ 8/500 53013 6004/ 10042 20037

SUMMARY FOR FRIDAY, JANUARY 1, 2021

TEMPERATURE (DEGREES F)
MAX…….36   NORMAL…..35
MIN…….25   NORMAL…..19
MEAN……31   NORMAL…..27

DEPARTURE FROM 30-YEAR NORMAL………………… +4
TOTAL DEPARTURE FOR THE MONTH………………….+4 [+3.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………34  DEPARTURE…… -4
TOTAL HEATING UNITS FOR THE MONTH……………34  DEPARTURE…….-4
TOTAL HEATING UNITS FOR THE SEASON…………1934  DEPARTURE…..-379
TOTAL HEATING UNITS LAST SEASON TO DATE…….2282  DEPARTURE…..-318

PEAK WIND GUST FOR YESTERDAY (MPH):
420C/Official…………..23 E   @ 11:53 P.M.
AEROVANE (south tower)…..23 NNW @  2:46 A.M.
ASOS…………………..21 E   @ 11:55 P.M.
DAVIS #1……………….22 ESE @ 11:53 P.M.
DAVIS #2 (south tower)…..23 N   @  2:48 A.M.
RMY……………………23     @ 11:54 P.M.
VECTOR…………………23     @ 11:52 P.M.
MERLIN………………..N/A

FASTEST MILE FOR YESTERDAY:
CONTACTING/OFFICIAL………………………..19 E   @ 11:54 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 E   @ 11:55 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 ESE @ 11:55 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 E   @ 11:54 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..19 SE  @ 11:52 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..19     @ 11:50 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL….6.4 NNW [154 total miles]
ASOS……………….7.0     [168 total miles]
DAVIS #1……………7.4 N   [178 total miles]
DAVIS #2……………7.4 N   [178 total miles]
RMY………………..7.1 W   [170 total miles]
VECTOR……………..7.6     [182 total miles]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.32  DEPARTURE….+0.18
ASOS………….0.32
TOTAL PRECIPITATION FOR THE MONTH………….0.32  DEPARTURE….+0.17
ASOS………….0.32
TOTAL PRECIPITATION FOR THE YEAR…………..0.32  DEPARTURE….+0.17
ASOS…………0.32

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.3  DEPARTURE…..-0.2
TOTAL SNOWFALL FOR THE MONTH……………… 0.3  DEPARTURE…..-0.3
TOTAL SNOWFALL FOR THE SEASON……………..26.5  DEPARTURE…..+9.9

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 The low since midnight is 33F, the daily normal low is 19F

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 2
HIGH 62F IN 1890
LOW -7F IN 1899,1918
PRECIP 2.10 INS. IN 1987
SNOWFALL 9.0 INS. IN 1904
PEAK GUST 85e MPH S IN 1942

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

TODAY’S REPORT PREPARED BY: Lizzy Suzedell

Category: Daily Discussions

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