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

WEDNESDAY, JANUARY 27, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0702E
SUNSET:  1652E

SOME SNOWFALL TO END OFF A DRY MONTH....

Today we measured 4.2 inches of snow this morning, with 
an additional 1/10th inch falling between 7 A.M. and 10 A.M.
Liquid precipitation total was 0.29 inches for the whole 
event, yielding a 15:1 snow to liquid ratio. 

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 light and northwesterly, with a peak gust around
12 mph. 

Visibility was 2 miles on average during the snowfall, opening 
up to almost 20 miles after it ended. 

The high temperature so far today is 33F, this is a degree
below the daily normal maximum of 34F. The low since midnight
is 27F, which is 10 degrees above the normal minimum of 17F. 


Today's Observations:

7 A.M.
Weather: Overcast stratus, light snow
Temperature: 27F; Dew Point: 27F; Relative Humidity: 100%
Wind: N @ 9 kts
Sea-level pressure: 29.93 in Hg; falling, then rising
Visibility: 2 miles, except 1/2 mile NW-E
6-hr Max temp: 29F
6-hr Min temp: 27F
24-hr Precip: 0.28 ins.
24-hr Snow: 4.2 ins.
Snow Depth: 3 ins.
BHO SA 1155 10 OVC 2S-F 135/27/27/3509/993/ S-CTD VSBY NW-NE 
1/2 MI NEW SNW PST 24 HRS 4.2 INS/ 8/6// 4/003 70028 53014 
10029 20027

10 A.M.
Weather: Overcast stratus, very light snow
Temperature: 29F; Dew Point: 29F; Relative Humidity: 100%
Wind: N @ 8 kts  
Sea-level pressure: 29.99 in Hg; rising then steady
Visibility: 2 miles, except 1/2 mile NW-E
3-hr Precip: 0.01 ins.
3-hr Snow: 0.1 ins.
BHO SA 1455 10 OVC 2S-F 153/29/29/3508/999/ S-CTD VSBY NW-NE 
1/2 MI NEW SNW PST 3 HRS 0.1 INS/ 8/6// 6001/ 53018

1 P.M.
Weather: Overcast stratus
Temperature: 32F, Dew point: 31F; Relative Humidity: 96%
Wind: NNW @ 7 kts 
Sea-level pressure: 29.99 inches Hg, rising, then falling
Visibility: 15 miles, thin fog
6-hr Max temp: 33F
6-hr Min temp: 27F
6-hr Precip: 0.01 ins.
6-hr Snow: 0.1 ins.
Snow Depth: 3 ins.
BHO SA 1755 10 OVC 15 154/32/31/3307/999/ THN F ALQDS NEW SNW 
6 HRS 0.1 INS/ 8/6// 4/003 6001/ 50001 10033 20027


SUMMARY FOR TUESDAY, JANUARY 26, 2021

TEMPERATURE (DEGREES F)
MAX.......36   NORMAL.....34
MIN.......20   NORMAL.....17
MEAN......28   NORMAL.....25

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL........ +3
TOTAL DEPARTURE FOR THE MONTH...................+155 [+5.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............37  DEPARTURE......-3
TOTAL HEATING UNITS FOR THE MONTH..............874  DEPARTURE.....-154
TOTAL HEATING UNITS FOR THE SEASON............2804  DEPARTURE.....-529
TOTAL HEATING UNITS LAST SEASON TO DATE.......3066  DEPARTURE.....-262

PEAK WIND GUST (MPH):
                     420C/Official..............18 E   @ 11:37 A.M.
                     AEROVANE (south tower).....18 E   @ 11:37 A.M. 
                     ASOS.......................20 E   @ 11:37 A.M.
                     DAVIS #1...................20 E   @ 11:36 A.M.
                     DAVIS #2 (south tower).....20 ENE @ 11:37 A.M.
                     RMY........................20     @ 11:26 A.M
                     VECTOR.....................21     @ 11:35 A.M.
                     MERLIN.....................20

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL..................15 E   @ 11:38 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................15 E   @ 11:38 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............15 E   @ 11:36 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............15 E   @ 11:53 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE....................14 ESE @ 11:26 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE.................15     @ 11:35 A.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL....8.2 ENE [196 total miles]
                     ASOS...................9.2     [209 total miles]
                     DAVIS #1...............8.8 NE  [202 total miles]
                     DAVIS #2...............8.7 NE  [201 total miles]
                     RMY....................8.4 ENE [201 total miles]
                     VECTOR.................8.7     [201 total miles]


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.22  DEPARTURE....+0.14
                             ASOS.............0.26
TOTAL PRECIPITATION FOR THE MONTH.............2.22  DEPARTURE....-1.46
                             ASOS.............2.26
TOTAL PRECIPITATION FOR THE YEAR..............2.22  DEPARTURE....-1.46
                              ASOS............2.26

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M...........4.2  DEPARTURE.....+3.7
TOTAL SNOWFALL FOR THE MONTH.................. 6.2  DEPARTURE.....-8.2
TOTAL SNOWFALL FOR THE SEASON.................32.4  DEPARTURE.....+2.0


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  The low since midnight is 27F, 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 27
HIGH 63F IN 1974
LOW -12F IN 1924
PRECIP 1.59 INS. IN 1996
SNOWFALL 25.2 INS. IN 2015 [RECORD FOR MONTH]
PEAK GUST 91 MPH SSE IN 1996

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

TODAY'S REPORT PREPARED BY: Benjamin Turner