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

SATURDAY, MARCH 20, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0547E
SUNSET:  1757E

PLENTY OF SUNSHINE AND MILD TEMPERATURES AS WE WELCOME
ASTRONOMICAL SPRING...

Can't really ask for a better day today. Clear skies,
excellent visibility, and mild temperatures. All in all today
is what many might consider a top 10 day!

Dry conditions continue to be an issue however. Higher than
normal fire risks exist as a result. The monthly precipitation
departure stands at -2.40" and the yearly departure -2.82".

The high so far today is 56F, which is 11 degrees above the
normal high of 45F. The low since midnight is 24F, which
is 4 degrees below the daily normal low of 28F.


Today's Observations:

7 A.M.
Weather: Clear, few cirrus distant N
Temperature: 30F; Dew Point: 8F; Relative Humidity: 39%
Wind: W @ 8 kts
Sea-level pressure: 30.49 in Hg; rising steadily
Visibility: 80 miles
6-hr Max temp: 30F
6-hr Min temp: 24F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 80 326/30/8/2708/049/ FEW CI DSNT N/
8/001 52011 10030 20024

10 A.M.
Weather: Clear
Temperature: 43F; Dew Point: 17F; Relative Humidity: 34%
Wind: SW @ 6 kts
Sea-level pressure: 30.50 in Hg; rising, then steady
Visibility: 80 miles
3-hr Precip: 0.00 ins
3-hr Snow: 0.0 ins.
BHO SA 1455 CLR 80 328/43/17/2306/050/ 8/000 51002

1 P.M.
Weather: Clear, few cirrus all quadrants
Temperature: 55F, Dew point: 18F; Relative Humidity: 23%
Wind: WSW @ 8G18 kts
Sea-level pressure: 30.45 in Hg; falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 56F
6-hr Min temp: 30F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 80 312/55/18/2508G18/045/ FEW CI ALQDS/
8/001 58016 10056 20030


SUMMARY FOR FRIDAY, MARCH 19, 2021

TEMPERATURE (DEGREES F)
MAX.......39     NORMAL.....45
MIN.......26     NORMAL.....27
MEAN......33     NORMAL.....36

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL....... -3
TOTAL DEPARTURE FOR THE MONTH................... -2 [-0.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............32  DEPARTURE...... +3
TOTAL HEATING UNITS FOR THE MONTH..............600  DEPARTURE...... +2
TOTAL HEATING UNITS FOR THE SEASON............4645  DEPARTURE.....-521
TOTAL HEATING UNITS LAST SEASON TO DATE.......4579  DEPARTURE......+66

PEAK WIND GUST (MPH):
                     420C/Official..............37 N   @ 12:26 A.M.
                     AEROVANE (south tower).....38 N   @  3:12 A.M.
                     ASOS.......................37 N   @  3:31 A.M.
                     DAVIS #1...................36 NNE @ 12:24 A.M.
                     DAVIS #2 (south tower).....37 N   @ 12:24 A.M.
                     RMY........................41     @  1:08 A.M.
                     VECTOR.....................44     @ 12:56 A.M.
                     MERLIN.....................40

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL..................26 N   @  3:15 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................25 N   @  3:16 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............26 NNE @  3:16 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............25 NNE @ 12:26 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE....................25 NE  @  3:13 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE.................26     @  3:13 A.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL......14.3 NNW [343 total miles]
                     ASOS.....................14.1  
                     DAVIS #1.................14.3 N  
                     DAVIS #2.................14.3 N
                     RMY......................13.4 N
                     VECTOR...................14.0

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.00  DEPARTURE....-0.19
                             ASOS.............0.00
TOTAL PRECIPITATION FOR THE MONTH.............0.94  DEPARTURE....-2.40
                             ASOS.............0.98
TOTAL PRECIPITATION FOR THE YEAR..............8.94  DEPARTURE....-2.82
                              ASOS............9.24

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M.......... 0.0  DEPARTURE.... -0.4
TOTAL SNOWFALL FOR THE MONTH.................. 0.2  DEPARTURE.... -8.7
TOTAL SNOWFALL FOR THE SEASON.................72.6  DEPARTURE....+17.2


PRELIMINARY CLIMATE SUMMARY FOR MARCH 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

03/01   42/24/33/+2/0.13/T/020/03        69 WNW  AERO 78 WNW  RMY 78
03/02   27/10/19/-12/T/0.1/679/100       63 WNW  AERO 71 WNW  RMY 69
03/03   45/19/32/0/0.00/0.0/375/55       30 W    AERO 30 W    RMY 34
03/04   38/22/30/-2/0.00/0.0/520/76      46 NW   AERO 51 NW   RMY 53
03/05   31/18/25/-7/0.00/0.0/549/80      39 WNW  AERO 44 NW   RMY 45
03/06   33/15/24/-8/0.00/0.0/675/98      28 WNW  AERO 29 WNW  RMY 30
03/07   35/15/25/-8/0.00/0.0/686/99      21 NW   AERO 22 NW   RMY 23
03/08   38/19/29/-4/T/T/389/56           20 NW   AERO 20 NW   RMY 21
03/09   56/30/43/+10/T/T/.../..          32 WNW  AERO 35 WNW  RMY 37
03/10   54/32/43/+10/0.00/0.0/.../..     29 SSW  AERO 29 SSW  RMY 31
03/11   71/35/53/+19/0.00/0.0/.../..     41 SSW  AERO 43 SSW  RMY 46
03/12   62/42/52/+18/0.00/0.0/.../..     52 WNW  AERO 59 WNW  RMY 57
03/13   46/27/37/+3/0.00/0.0/.../..      53 WNW  AERO 59 WNW  RMY 57
03/14   45/19/32/-3/0.01/0.1/.../..      51 WNW  AERO 58 NW   RMY 58
03/15   27/12/20/-15/0.00/0.0/.../..     48 NW   AERO 47 NW   RMY 54
03/16   37/13/25/-10/0.00/0.0/.../..     22 NNW  AERO 22 NNW  RMY 23
03/17   52/27/40/+4/0.00/0.0/.../..      28 S    AERO 25 S    RMY 29
03/18   46/34/40/+4/0.80/T/.../..        38 NE   AERO 40 NE   RMY 42
03/19   39/26/33/-3/T/T/.../..           37 N    AERO 38 N    RMY 41

03/20 The low since midnight is 24F, the daily normal low is 28F


DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR MARCH 20
HIGH 79 IN 1945
LOW 4 IN 1885
PRECIP 1.39 INS. IN 1957
SNOWFALL 11.4 INS. IN 1957
PEAK GUST 63 MPH SE IN 1975

RECORDS FOR MARCH 21
HIGH 81 IN 1921
LOW 2 IN 1885
PRECIP 2.67 INS. IN 1974
SNOWFALL 10.6 INS. IN 1958
PEAK GUST 72 MPH NE IN 1958


TODAY'S REPORT PREPARED BY: Matt Douglas