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

MONDAY, JANUARY 25, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0704E
SUNSET:  1650E

CHILLY AIR MASS CONTINUES WITH GRADUALLY DIMINISHING WIND....

After a couple of days of gusty winds, they are finally 
diminishing. Today winds have been gusting between 20-25 mph 
compared to 40+ mph over the weekend.

Despite the temperature getting a bit higher today than
yesterday, the air mass is still of an arctic nature with
dew points holding in the mid single digits. This does tend
to add a bit of a bite to the air, especially with the
breeze blowing.

Visibility has been excellent today rising from 60 miles
early this morning to 80 miles into this afternoon.

The high temperature so far today is 34F, this is equal to the
daily normal maximum of 34F. The low since midnight is 15F, 
which is 2 degrees below the normal minimum of 17F. 


Today's Observations:

7 A.M.
Weather: Clear, few stratocumulus offshore distant ENE-SE,
few cirrus distant SW-W
Temperature: 16F; Dew Point: 8F; Relative Humidity: 70%
Wind: NW @ 14G19 kts
Sea-level pressure: 30.03 in Hg; steady, then rising
Visibility: 60 miles
6-hr Max temp: 18F
6-hr Min temp: 15F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 60 169/16/8/3114G19/003/ FEW SC OFFSHR DSNT ENE-SE
FEW CI DSNT SW-W/ 8/501 53010 10018 20015

10 A.M.
Weather: Clear, few stratocumulus offshore distant ENE-ESE, 
few altocumulus standing lenticular distant NNW-N, few cirrus 
distant SE-SW-W
Temperature: 25F; Dew Point: 7F; Relative Humidity: 46%
Wind: NW @ 14G20 kts  
Sea-level pressure: 30.06 in Hg; rising, then more slowly
Visibility: 80 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 CLR 80 178/25/7/3114G20/006/ FEW SC OFFSHR DSNT ENE-ESE
FEW ACSL DSNT NNW-N FEW CI DSNT SE-SW-W/ 8/541 51009

1 P.M.
Weather: Clear, few stratocumulus offshore distant ENE-SE, 
few altocumulus distant N, few cirrus distant ESE-SW-W
Temperature: 34F, Dew point: 6F; Relative Humidity: 31%
Wind: NW @ 12G20 kts 
Sea-level pressure: 30.00 inches Hg, falling, then more slowly
Visibility: 80 miles
6-hr Max temp: 34F
6-hr Min temp: 16F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 80 159/34/6/3212G20/000/ FEW SC OFFSHR DSNT ENE-SE
FEW AC DSNT N FEW CI DSNT ESE-SW-W/ 8/571 56019 10034 20016


SUMMARY FOR SUNDAY, JANUARY 24, 2021

TEMPERATURE (DEGREES F)
MAX.......29   NORMAL.....34
MIN.......13   NORMAL.....17
MEAN......21   NORMAL.....25

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL........ -4
TOTAL DEPARTURE FOR THE MONTH...................+152 [+6.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............44  DEPARTURE...... +4
TOTAL HEATING UNITS FOR THE MONTH..............797  DEPARTURE.....-152
TOTAL HEATING UNITS FOR THE SEASON............2727  DEPARTURE.....-526
TOTAL HEATING UNITS LAST SEASON TO DATE.......3021  DEPARTURE.....-294

PEAK WIND GUST (MPH):
                     420C/Official..............43 WNW @  1:46 P.M.
                     AEROVANE (south tower).....48 WNW @  5:13 A.M. 
                     ASOS.......................43 W   @  1:45 P.M.
                     DAVIS #1...................45 W   @  1:45 P.M.
                     DAVIS #2 (south tower).....42 WNW @  5:13 A.M.
                     RMY........................44     @  2:18 P.M
                     VECTOR.....................48     @  4:09 A.M.
                     MERLIN.....................N/A

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL..................29 WNW @  1:46 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................28 WNW @  2:22 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............29 WNW @  1:48 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............32 WNW @  1:45 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE....................26 NW  @  1:45 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE.................28     @  2:20 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL...19.7 WNW [473 total miles]
                     ASOS..................18.7     [449 total miles]
                     DAVIS #1..............19.7 NW  [473 total miles]
                     DAVIS #2..............20.7 NW  [497 total miles]
                     RMY...................18.0 NW  [432 total miles]
                     VECTOR................19.1     [458 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....-1.46
                             ASOS.............2.00
TOTAL PRECIPITATION FOR THE YEAR..............1.94  DEPARTURE....-1.46
                              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....-11.4
TOTAL SNOWFALL FOR THE SEASON.................28.2  DEPARTURE.....-1.2


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  The low since midnight is 15F, 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 25
HIGH 56F IN 2010
LOW -10F IN 1935
PRECIP 2.24 INS. IN 1979
SNOWFALL 12.5 INS. IN 1941
PEAK GUST 81 MPH WNW IN 1972

RECORDS FOR JANUARY 26
HIGH 68F IN 1950 [RECORD FOR MONTH]
LOW -5F IN 1920
PRECIP 1.60 INS. IN 1958
SNOW 9.0 INS. IN 1898
WIND 90e MPH SE IN 1978

TODAY'S REPORT PREPARED BY: Matt Douglas