Saturday, March 20, 2021
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
