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

FRIDAY, JANUARY 22, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0706E
SUNSET:  1646E

MOSTLY CLOUDY, POKES OF SUN, MILDER....

We recorded another day yesterday of light snow. This marks the
10th day this month with falling snow. However, only 5 of these 
days were measurable with at least 0.1 inches on the ground.
We currently have only collected 2.0 inches of snow so far this month,
which is on pace for the 9th least snowiest January on record here.
Speaking of deficits, we are approximately 1 inch below average for
precipitation. 

Yesterday also marked the conclusion of our above average streak.
Wednesday the 20th marked the 31st consecutive day of above normal
temperatures, which commenced on December 21st! Yesterday was also
the first below normal day since December 19th!

Today, we began under most cloudy skies thanks to a blanket of
mid-level Altocumulus.  Altocumulus dissipated and gave way to 
broken cumulus. Visibility has not been too great - 50 miles at best
despite good dew point depressions.

Today is also noticeably warmer with the high so far reaching 42F.
Winds are averaging 9 MPH with a peak gust so far of 25 MPH.

The high temperature so far today is 42F, this is 8 degrees
above the daily normal maximum of 34F. The low since midnight
is 29F, which is 12 degrees above the normal minimum of 17F. 


Today's Observations:

7 A.M.
Weather: Broken Altocumulus
Temperature: 29F; Dew Point: 22F; Relative Humidity: 75%
Wind: W @ 8 kts
Sea-level pressure: 29.57 in Hg; falling, then rising
Visibility: 20 miles, hazy
6-hr Max temp: 33F
6-hr Min temp: 29F
24-hr Precip: Trace.
24-hr Snow: Trace.
Snow Depth: 0 ins.
BHO SA 1155 E110 BKN 20 014/29/22/2608/957/ HAZY/ 8/050 53004 70000 10033 20029 

10 A.M.
Weather: Broken Altocumulus & Altostratus, (thin) Broken Cirrus
Temperature: 35F; Dew Point: 25F; Relative Humidity: 66%
Wind: W @ 9 kts 
Sea-level pressure: 29.62 in Hg; rising, then rising more rapidly
Visibility: 25 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 E12O BKN E200 -BKN 25 029/35/25/2809/962/ HAZY/ 8/051 53015

1 P.M.
Weather: Broken Cumulus
Temperature: 39F, Dew point: 25F; Relative Humidity: 56%
Wind: WNW @ 14G19 kts 
Sea-level pressure: 29.59 inches Hg, steady, then falling
Visibility: 50 miles, hazy
6-hr Max temp: 42F
6-hr Min temp: 29F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 E50 BKN 50 019/39/25/2914G19/959/ HAZY/ 8/100 58010 10042 20029


SUMMARY FOR THURSDAY, JANUARY 21, 2021

TEMPERATURE (DEGREES F)
MAX.......31   NORMAL.....34
MIN.......17   NORMAL.....17
MEAN......24   NORMAL.....25

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL.........-1
TOTAL DEPARTURE FOR THE MONTH...................+148 [+6.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............41  DEPARTURE.......+1
TOTAL HEATING UNITS FOR THE MONTH..............681  DEPARTURE.....-147
TOTAL HEATING UNITS FOR THE SEASON............2611  DEPARTURE.....-522
TOTAL HEATING UNITS LAST SEASON TO DATE.......2924  DEPARTURE.....-313

PEAK WIND GUST (MPH):
                     420C/Official..............23 WNW @  1:18 A.M.
                     AEROVANE (south tower).....24 SSW @ 12:45 P.M. 
                     ASOS.......................22 SSW @ 11:59 A.M.
                     DAVIS #1...................24   W @  1:17 A.M.
                     DAVIS #2 (south tower).....25  SW @ 12:43 P.M.
                     RMY........................24     @ 11:58 A.M
                     VECTOR.....................24     @  1:18 A.M.
                     MERLIN.....................22

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL..................16 SSW @ 11:57 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................16   S @ 12:31 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............16 WNW @  1:19 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............18 WNW @  1:18 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE....................17  SW @ 11:55 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE.................17     @ 11:54 A.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL... 8.7 SSW [208 total miles]
                     ASOS.................. 8.8     [211 total miles]
                     DAVIS #1...............9.1 WSW [218 total miles]
                     DAVIS #2...............9.7 WSW [234 total miles]
                     RMY................... 8.9 SW  [214 total miles]
                     VECTOR.................9.4     [226 total miles]


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M......TRACE  DEPARTURE....-0.14
                             ASOS.............0.00
TOTAL PRECIPITATION FOR THE MONTH.............1.94  DEPARTURE....-1.04
                             ASOS.............2.00
TOTAL PRECIPITATION FOR THE YEAR..............1.94  DEPARTURE....-1.04
                              ASOS............2.00

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M...........0.1  DEPARTURE.....-0.5
TOTAL SNOWFALL FOR THE MONTH.................. 2.0  DEPARTURE.....-9.7
TOTAL SNOWFALL FOR THE SEASON.................28.2  DEPARTURE.....+0.5


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/T/.../..            23 WNW  AERO 24 SSW  RMY 24

01/22  The low since midnight is 29F, 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 22
HIGH 59F IN 1916
LOW -8F IN 1888,1976
PRECIP 1.24 INS. IN 1891,1987
SNOWFALL 10.0 INS. IN 2005
PEAK GUST 67 MPH W IN 1976

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

TODAY'S REPORT PREPARED BY: Andrew Swanson