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

SATURDAY, JANUARY 23, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0706E
SUNSET:  1647E

CHILLY WITH A CONSISTENT WESTERLY WIND 
FOLLOWING THE COLD FRONT....

Today we observed 75 miles of visibility, and daytime temperatures
were actually colder than normal despite abundant afternoon sunshine.
The weather was also dry, as the dew point is currently in the 
single digits. The biggest weather feature today has to be the wind.
We are seeing a consistent 20 mph from the west, with frequent gusts
above 30 mph this afternoon. The max gust as of yet is 40 mph. With 
that being said, a cool and dry air mass is dominating the region
after a cold front passed through yesterday.  

The high temperature so far today is 29F, this is 5 degrees
below the daily normal maximum of 34F. The low since midnight
is 25F, which is 8 degrees above the normal minimum of 17F. 


Today's Observations:

7 A.M.
Weather: Broken stratocumulus and altocumulus
Temperature: 25F; Dew Point: 14F; Relative Humidity: 63%
Wind: WNW @ 11G16 kts, peak of 29 mph at 6:46 A.M.
Sea-level pressure: 29.84 in Hg; falling, then rising
Visibility: 50 miles
6-hr Max temp: 28F
6-hr Min temp: 25F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 40 BKN 80 BKN 50 105/25/14/2911G16/984/ PK WND 
2725/46/ 8/550 53009 10028 20025  

10 A.M.
Weather: Broken stratocumulus and altocumulus
Temperature: 25F; Dew Point: 12F; Relative Humidity: 57%
Wind: NW @ 16G24 kts 
Sea-level pressure: 29.87 in Hg; rising steadily
Visibility: 70 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 40 SCT 90 BKN 70 114/25/12/3116G24/987/ 8/850 51009

1 P.M.
Weather: Scattered cumulus
Temperature: 28F, Dew point: 9F; Relative Humidity: 44%
Wind: WNW @ 18G33 kts, peak of 38 mph at 12:47 P.M. 
Sea-level pressure: 29.83 inches Hg, falling steadily
Visibility: 75 miles
6-hr Max temp: 29F
6-hr Min temp: 24F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 40 SCT 75 102/28/9/2918G33/983/ PK WND 3133/47/ 
8/100 58012 10029 20024


SUMMARY FOR FRIDAY, JANUARY 22, 2021

TEMPERATURE (DEGREES F)
MAX.......42   NORMAL.....34
MIN.......29   NORMAL.....17
MEAN......36   NORMAL.....25

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL........+11
TOTAL DEPARTURE FOR THE MONTH...................+159 [+7.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............29  DEPARTURE......-11
TOTAL HEATING UNITS FOR THE MONTH..............710  DEPARTURE.....-159
TOTAL HEATING UNITS FOR THE SEASON............2640  DEPARTURE.....-533
TOTAL HEATING UNITS LAST SEASON TO DATE.......2965  DEPARTURE.....-325

PEAK WIND GUST (MPH):
                     420C/Official..............28 WNW @  2:21 P.M.
                     AEROVANE (south tower).....24 WNW @  2:19 P.M. 
                     ASOS.......................28 WNW @  2:21 P.M.
                     DAVIS #1...................28 WNW @  2:20 P.M.
                     DAVIS #2 (south tower).....25 WNW @  2:20 P.M.
                     RMY........................29     @  3:01 P.M
                     VECTOR.....................30     @  2:20 P.M.
                     MERLIN.....................28

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL..................19 WNW @  1:36 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................18 WNW @  2:22 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............21 W   @  1:15 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............21 WNW @  1:15 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE....................18 WNW @  1:12 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE.................19     @  1:13 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL...10.5 WNW [253 total miles]
                     ASOS..................10.7     [260 total miles]
                     DAVIS #1..............11.3 WNW [271 total miles]
                     DAVIS #2..............11.9 WNW [286 total miles]
                     RMY...................10.2 WNW [245 total miles]
                     VECTOR................11.0     [256 total miles]


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.00  DEPARTURE....-0.14
                             ASOS.............0.00
TOTAL PRECIPITATION FOR THE MONTH.............1.94  DEPARTURE....-1.18
                             ASOS.............2.00
TOTAL PRECIPITATION FOR THE YEAR..............1.94  DEPARTURE....-1.18
                              ASOS............2.00

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M...........0.0  DEPARTURE.....-0.6
TOTAL SNOWFALL FOR THE MONTH.................. 2.0  DEPARTURE....-10.3
TOTAL SNOWFALL FOR THE SEASON.................28.2  DEPARTURE.....-0.1


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/..../.../.../..      28 WNW  AERO 24 WNW  RMY 29

01/23  The low since midnight is 24F, 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 23
HIGH 62F IN 1906
LOW -10F IN 1976
PRECIP 2.40 INS. IN 1935
SNOWFALL 14.6 INS. IN 1966
PEAK GUST 85 MPH S IN 1992

RECORDS FOR JANUARY 24
HIGH 60F IN 1967
LOW -12F IN 1907
PRECIP 2.04 INS. IN 1998
SNOWFALL 11.3 INS. IN 1935
PEAK GUST 82 MPH S IN 1996

TODAY'S REPORT PREPARED BY: Benjamin Turner