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

TUESDAY, JANUARY 19, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0708E
SUNSET:  1642E

A BIT COOLER, BUT CONTINUED DRY WITH A MIX OF SUN AND CLOUDS....

A mix of sun and clouds have been the theme today with a bit
less wind than the past 3 days. It's also a bit cooler today 
than yesterday with temperatures so far holding in the upper
30s compared to low 40s yesterday.

Visibility has become very good today with values increasing
from 50 miles early this morning to 70 miles mid morning into
early this afternoon.

The stretch of above normal temperatures continues as well.
Today will likely mark the 30th consecutive day of above
normal temperatures, stretching back to December 21st!

The high temperature so far today is 39F, this is 6 degrees
above the daily normal maximum of 33F. The low since midnight
is 23F, 6 degrees above the normal minimum of 17F. 


Today's Observations:

7 A.M.
Weather: Scattered altocumulus/altostratus, broken cirrus,
few stratocumulus offshore distant NE-ESE and distant SSE-S
Temperature: 24F; Dew Point: 15F; Relative Humidity: 68%
Wind: W @ 9 kts 
Sea-level pressure: 29.96 in Hg; rising, then more rapidly
Visibility: 50 miles
6-hr Max temp: 27F
6-hr Min temp: 23F
24-hr Precip: Trace
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 100 SCT E220 BKN 50 146/24/15/2809/996/ FEW SC OFFSHR
DSNT NE-ESE AND DSNT SSE-S/ 8/574 53019 70000 10027 20023

10 A.M.
Weather: Scattered altocumulus/altostratus, thin scattered cirrus,
few stratocumulus distant S-W
Temperature: 32F; Dew Point: 17F; Relative Humidity: 54%
Wind: WNW @ 8G18 kts 
Sea-level pressure: 30.01 in Hg; rising, then more rapidly
Visibility: 70 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 100 SCT 250 -SCT 70 161/32/17/2908G18/001/ FEW SC DSNT S-W/
8/571 53015

1 P.M.
Weather: Broken altocumulus/altostratus, thin broken cirrus,
few stratocumulus E-S-W-NW
Temperature: 37F, Dew point: 21F; Relative Humidity: 52%
Wind: WNW @ 10G19 kts 
Sea-level pressure: 29.94 inches Hg, falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 39F
6-hr Min temp: 24F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 E100 BKN 250 -BKN 70 140/37/21/2910G19/994/ FEW SC E-S-W-NW/
8/571 58021 10039 20024


SUMMARY FOR MONDAY, JANUARY 18, 2021

TEMPERATURE (DEGREES F)
MAX.......42   NORMAL.....33
MIN.......27   NORMAL.....17
MEAN......35   NORMAL.....25

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL.......+10
TOTAL DEPARTURE FOR THE MONTH...................+138 [+7.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............30  DEPARTURE......-10
TOTAL HEATING UNITS FOR THE MONTH..............571  DEPARTURE.....-137
TOTAL HEATING UNITS FOR THE SEASON............2501  DEPARTURE.....-511
TOTAL HEATING UNITS LAST SEASON TO DATE.......2796  DEPARTURE.....-295

PEAK WIND GUST (MPH):
                     420C/Official..............35 W   @  3:56 P.M.
                     AEROVANE (south tower).....37 WNW @  7:37 P.M. 
                     ASOS.......................34 W   @  3:56 P.M.
                     DAVIS #1...................35 W   @  3:56 P.M.
                     DAVIS #2 (south tower).....34 W   @  3:47 P.M.
                     RMY........................36     @  3:55 P.M.
                     VECTOR.....................37     @  3:55 P.M.
                     MERLIN.....................33

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL..................25 W   @  3:54 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................23 W   @  4:00 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............27 W   @  3:55 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............28 W   @  3:49 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE....................23 W   @  3:55 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE.................24     @  3:45 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL...14.2 W   [341 total miles]
                     ASOS..................13.3     [319 total miles]
                     DAVIS #1..............14.7 W   [353 total miles]
                     DAVIS #2..............15.0 W   [360 total miles]
                     RMY...................13.2 W   [317 total miles]
                     VECTOR................14.1     [338 total miles]


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M......TRACE  DEPARTURE....-0.13
                             ASOS.............1.06
TOTAL PRECIPITATION FOR THE MONTH.............1.94  DEPARTURE....-0.61
                             ASOS.............2.00
TOTAL PRECIPITATION FOR THE YEAR..............1.94  DEPARTURE....-0.61
                              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.................. 1.9  DEPARTURE.....-8.2
TOTAL SNOWFALL FOR THE SEASON.................28.1  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/.../..       23 WNW  AERO 23 WNW  RMY 24
01/13   40/26/33/+8/0.00/0.0/.../..       15 SW   AERO 14 SW   RMY 19
01/14   38/31/35/+10/0.09/T/.../..        16 SSW  AERO 16 SSW  RMY 19
01/15   40/32/36/+11/0.00/0.0/.../..      25 ESE  AERO 23 ESE  RMY 27 TSTM
01/16   52/33/43/+18/1.00/0.0/.../..      48 ESE  AERO 53 SE   RMY 54
01/17   41/32/37/+12/0.00/0.0/.../..      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 The low since midnight is 23F, 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 19
HIGH 59F IN 1973
LOW -11F IN 1887
PRECIP 2.34 INS. IN 1936
SNOWFALL 10.5 INS. IN 1936
PEAK GUST 93e MPH WNW IN 1943

RECORDS FOR JANUARY 20
HIGH 59F IN 1951
LOW -9F IN 1901
PRECIP 1.95 INS. IN 1978
SNOWFALL 19.0 INS. IN 1978 
PEAK GUST 76e MPH NE IN 1978

TODAY'S REPORT PREPARED BY: Matt Douglas