Thursday, January 28, 2021

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

THURSDAY, JANUARY 28, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0701E
SUNSET:  1653E

A NICE 2-DAY SNOWFALL STREAK, HOWEVER A BIT
LIGHTER TODAY….

Today we measured 0.3 inches of snow this morning, with
an additional half inch falling between 7 A.M. and 1 P.M.

We are behind on snow for the month, still being over 8
inches under the monthly average snow total. However, we
are 2 inches above the seasonal total thanks to abundant
snowfall in December.

Wind has been consistent at 10 mph from the northwest, with
a peak gust around 20 mph.

Visibility was a 1/2 mile on average, increasing to 5 miles
in the afternoon hours. It is currently still snowing lightly.

The high temperature so far today is 29F, this is 5 degrees
below the daily normal maximum of 34F. The low since midnight
is 26F, which is 9 degrees above the normal minimum of 17F.

Today’s Observations:

7 A.M.
Weather: Light snow
Temperature: 28F; Dew Point: 28F; Relative Humidity: 100%
Wind: NNW @ 8 kts
Sea-level pressure: 29.97 in Hg; falling, then rising
Visibility: 1/2 mile, fog
6-hr Max temp: 29F
6-hr Min temp: 28F
24-hr Precip: 0.04 ins.
24-hr Snow: 0.3 ins.
Snow Depth: 3 ins.
BHO SA 1155 X W3 1/2S-F 149/28/28/3308/997/ S-CTD NEW SNW
PST 24 HRS 0.3 INS/ 8//// 4/003 70004 55003 10029 20028

10 A.M.
Weather:  Light snow
Temperature: 27F; Dew Point: 27F; Relative Humidity: 100%
Wind: NNW @ 14G19 kts
Sea-level pressure: 29.97 in Hg; rising then steady
Visibility: 1/2 mile, fog
3-hr Precip: 0.04 ins.
3-hr Snow: 0.5 ins.
BHO SA 1455 X W3 1/2S-F 150/27/27/3314G19/997/ S-CTD NEW
SNW PST 3 HRS 0.5 INS/ 8//// 6004/ 53001

1 P.M.
Weather: Overcast stratus, light snow
Temperature: 27F, Dew point: 27F; Relative Humidity: 100%
Wind: NW @ 10G15 kts
Sea-level pressure: 29.93 inches Hg, falling steadily
Visibility: 5 miles, fog
6-hr Max temp: 29F
6-hr Min temp: 26F
6-hr Precip: 0.05 ins.
6-hr Snow: 0.5 ins.
Snow Depth: 3 ins.
BHO SA 1755 20 OVC 5S-F 136/27/27/3210G15/993/ S-CTD PCPN VRY
LGT NEW SNW PST 6 HRS 0.5 INS/ 8/6// 4/003 6005/ 58014 10029
20026

SUMMARY FOR WEDNESDAY, JANUARY 27, 2021

TEMPERATURE (DEGREES F)
MAX…….33   NORMAL…..34
MIN…….27   NORMAL…..17
MEAN……30   NORMAL…..25

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….. +5
TOTAL DEPARTURE FOR THE MONTH……………….+160 [+5.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………35  DEPARTURE……-5
TOTAL HEATING UNITS FOR THE MONTH…………..909  DEPARTURE…..-159
TOTAL HEATING UNITS FOR THE SEASON…………2839  DEPARTURE…..-534
TOTAL HEATING UNITS LAST SEASON TO DATE…….3093  DEPARTURE…..-254

PEAK WIND GUST (MPH):
420C/Official…………..16 NNW @ 11:26 P.M.
AEROVANE (south tower)…..17 NNW @ 11:52 P.M.
ASOS…………………..16 N   @ 11:54 P.M.
DAVIS #1……………….17 NNW @ 11:55 P.M.
DAVIS #2 (south tower)…..17 NNW @ 11:55 P.M.
RMY……………………17     @ 11:27 P.M
VECTOR…………………19     @ 11:26 P.M.
MERLIN…………………16

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………12 NNW @ 11:26 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….13 NNW @ 11:26 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………13 N   @ 11:26 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………13 N   @ 11:26 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..12 N   @ 11:23 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..12     @ 11:26 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL….7.5 NNW [179 total miles] ASOS……………….8.3     [191 total miles] DAVIS #1……………7.6 N   [181 total miles] DAVIS #2……………7.6 N   [181 total miles] RMY………………..7.7 N   [185 total miles] VECTOR……………..8.0     [184 total miles]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.04  DEPARTURE….-0.09
ASOS………….0.04
TOTAL PRECIPITATION FOR THE MONTH………….2.26  DEPARTURE….-1.55
ASOS………….2.30
TOTAL PRECIPITATION FOR THE YEAR…………..2.26  DEPARTURE….-1.55
ASOS…………2.30

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.3  DEPARTURE…..-0.3
TOTAL SNOWFALL FOR THE MONTH……………… 6.2  DEPARTURE…..-8.5
TOTAL SNOWFALL FOR THE SEASON……………..32.4  DEPARTURE…..+1.7

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/+4/0.06/0.3/330/60       23 E    AERO 23 NNW  RMY 23
01/02   43/30/37/+10/0.30/T/116/21        37 WNW  AERO 39 WNW  RMY 44
01/03   33/27/30/+4/0.07/0.8/000/00       23 NNE  AERO 22 NNE  RMY 25
01/04   37/28/33/+7/0.01/0.1/110/20       25 NNE  AERO 23 NNE  RMY 27
01/05   31/28/30/+4/0.05/0.7/000/00       21 NNW  AERO 21 NNW  RMY 22
01/06   38/28/33/+7/T/T/244/44            30 NW   AERO 29 NW   RMY 32
01/07   42/26/34/+8/0.00/0.0/516/93       28 NNW  AERO 26 NNW  RMY 31
01/08   40/21/31/+5/0.00/0.0/517/93       25 NNW  AERO 22 NNW  RMY 25
01/09   34/30/27/+1/0.00/0.0/395/71       25 N    AERO 23 N    RMY 24
01/10   39/24/32/+7/0.00/0.0/493/88       25 NNW  AERO 23 NNW  RMY 24
01/11   34/25/30/+5/0.00/0.0/000/00       17 SW   AERO 16 SSW  RMY 16
01/12   40/24/32/+7/0.00/0.0/438/78       23 WNW  AERO 23 WNW  RMY 24
01/13   40/26/33/+8/0.00/0.0/389/69       15 SW   AERO 14 SW   RMY 19
01/14   38/31/35/+10/0.09/T/000/00        16 SSW  AERO 16 SSW  RMY 19
01/15   40/32/36/+11/0.00/0.0/266/47      25 ESE  AERO 23 ESE  RMY 27 TSTM
01/16   52/33/43/+18/1.00/0.0/000/00      48 ESE  AERO 53 SE   RMY 54
01/17   41/32/37/+12/0.00/0.0/314/55      47 W    AERO 46 W    RMY 54
01/18   42/27/35/+10/T/0.0/…/..         35 W    AERO 37 WNW  RMY 36
01/19   39/23/31/+6/T/T/…/..            25 WNW  AERO 25 WNW  RMY 27
01/20   37/22/30/+5/T/T/…/..            32 WNW  AERO 33 WNW  RMY 34
01/21   31/17/24/-1/T/0.1/…/..          23 WNW  AERO 24 SSW  RMY 24
01/22   42/29/36/+11/0.00/0.0/…/..      28 WNW  AERO 24 WNW  RMY 29
01/23   29/14/22/-3/0.00/0.0/…/..       41 WNW  AERO 41 WNW  RMY 46
01/24   29/13/21/-4/0.00/0.0/…/..       43 WNW  AERO 48 WNW  RMY 44
01/25   35/15/25/0/0.00/0.0/…/..        28 NW   AERO 29 NW   RMY 30
01/26   36/20/28/+3/…./2.4/…/..       18 E    AERO 18 E    RMY 20
01/27   33/27/30/+5/…./1.9/…/..       16 NNW  AERO 17 NNW  RMY 17

01/28  The low since midnight is 26F, the daily normal low is 17F

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

RECORDS FOR JANUARY 28
HIGH 59F IN 1916
LOW -9F IN 1888, 1924
PRECIP 2.18 INS. IN 1897
SNOWFALL 15.0 INS. IN 1897
PEAK GUST 78e MPH SSE IN 1977

RECORDS FOR JANUARY 29
HIGH 66F IN 2002
LOW -11F IN 1888
PRECIP 1.48 INS. IN 1973
SNOWFALL 8.0 INS. IN 1943
PEAK GUST 72 MPH NW IN 1973

TODAY’S REPORT PREPARED BY: Benjamin Turner