Wednesday, March 31, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, MARCH 31, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0528E
SUNSET: 1809E
WINDY AND WARM WITH INCREASING CLOUDS….
Clouds have been steadily increasing during the day as our
next weather system approaches the region. However, despite
the cloudiness, a gusty south-southwest wind has been
advecting warmer and somewhat more humid air into the
region.
Winds have been gusting frequently over 30 mph with a peak
gust of 41 mph thus far.
Temperatures have risen nicely into the mid 60s through
early this afternoon. The high so far today is 66F, 17 degrees
above the normal high of 49F. The low since midnight is 43F,
which is 11 degrees above the daily normal low of 32F.
Today’s Observations:
7 A.M.
Weather: Scattered stratus fractus, broken altocumulus/castellanus,
thin broken cirrus
Temperature: 49F; Dew Point: 47F; Relative Humidity: 92%
Wind: SSW @ 15G22 kts
Sea-level pressure: 30.22 in Hg, falling, then steady
Visibility: 15 miles, thin fog
6-hr Max temp: 49F
6-hr Min temp: 43F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 3 SCT E40 BKN 250 -BKN 15 235/49/47/2015G22/022/
THN F ALQDS/ 8/681 56001 10049 20043
10 A.M.
Weather: Scattered stratocumulus/cumulus, broken altocumulus/
altostratus, thin broken cirrus
Temperature: 60F; Dew Point: 48F; Relative Humidity: 64%
Wind: S @ 19G28 kts, peak wind S 36 mph at 9:00 A.M.
Sea-level pressure: 30.16 in Hg; falling, then more slowly
Visibility: 25 miles, hazy
3-hr Precip: 0.00 ins
3-hr Snow: 0.0 ins.
BHO SA 1455 30 SCT E55 BKN 250 -BKN 25 214/60/48/1919G28/016/
HAZY PK WND 1931/00/ 8/471 56021
1 P.M.
Weather: Scattered stratocumulus, broken altocumulus, thin broken
cirrus, altocumulus standing lenticularis all quadrants
Temperature: 63F, Dew point: 47F; Relative Humidity: 55%
Wind: SSW @ 19G31 kts, peak wind S 37 mph at 12:41 P.M.
Sea-level pressure: 30.08 in Hg; falling, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 66F
6-hr Min temp: 43F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 35 SCT E55 BKN 250 -OVC 30 185/63/47/2019G31/008/
ACSL ALQDS HAZY PK WND 1932/41/ 8/445 56029 10066 20049
SUMMARY FOR TUESDAY, MARCH 30, 2021
TEMPERATURE (DEGREES F)
MAX…….58 NORMAL…..49
MIN…….31 NORMAL…..31
MEAN……45 NORMAL…..40
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….. +5
TOTAL DEPARTURE FOR THE MONTH………………..+124 [+3.9 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………20 DEPARTURE…… -5
TOTAL HEATING UNITS FOR THE MONTH…………..767 DEPARTURE…..-125
TOTAL HEATING UNITS FOR THE SEASON…………4812 DEPARTURE…..-647
TOTAL HEATING UNITS LAST SEASON TO DATE…….4843 DEPARTURE……-31
PEAK WIND GUST (MPH):
420C/Official…………..36 S @ 4:58 P.M.
AEROVANE (south tower)…..36 S @ 4:58 P.M.
ASOS…………………..35 S @ 5:00 P.M.
DAVIS #1……………….36 S @ 4:41 P.M.
DAVIS #2 (south tower)…..37 SSE @ 4:18 P.M.
RMY……………………37 @ 4:59 P.M.
VECTOR…………………38 @ 5:19 P.M.
MERLIN…………………34
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………28 SSW @ 4:42 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….28 SSW @ 4:42 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………28 SSW @ 4:42 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 SSW @ 4:43 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..28 SSW @ 4:40 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..28 @ 4:40 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……13.1 S [314 total miles] ASOS…………………13.1
DAVIS #1……………..12.7 N/A
DAVIS #2……………..13.8 SSW
RMY………………….13.0 SSW
VECTOR……………….13.3
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.18
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….1.86 DEPARTURE….-3.54
ASOS………….1.94
TOTAL PRECIPITATION FOR THE YEAR…………..9.86 DEPARTURE….-3.96
ASOS………..10.20
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………. 0.0 DEPARTURE…. -0.3
TOTAL SNOWFALL FOR THE MONTH……………… 0.2 DEPARTURE….-12.5
TOTAL SNOWFALL FOR THE SEASON……………..72.6 DEPARTURE….+13.4
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 58/24/41/+4/0.00/0.0/…/.. 23 W AERO 23 W RMY 27
03/21 62/39/51/+14/0.00/0.0/…/.. 22 S AERO 23 S RMY 25
03/22 62/36/49/+12/0.00/0.0/…/.. 21 S AERO 18 S RMY 22
03/23 65/38/52/+14/0.00/0.0/…/.. 22 ESE AERO 18 SE RMY 21
03/24 63/44/54/+16/0.01/0.0/…/.. 22 SSE AERO 21 SSE RMY 21
03/25 67/49/58/+20/0.10/0.0/…/.. 25 S AERO 26 S RMY 26
03/26 63/48/56/+17/0.01/0.0/…/.. 58 W AERO 67 W RMY 63
03/27 63/40/52/+13/0.00/0.0/…/.. 39 WNW AERO 41 WNW RMY 44
03/28 56/37/47/+8/0.80/0.0/…/.. 40 S AERO 41 S RMY 46
03/29 50/35/43/+3/T/0.0/…/.. 58 WNW AERO 62 WNW RMY 63
03/30 58/31/45/+5/0.00/0.0/…/.. 36 S AERO 36 S RMY 37
03/31 The low since midnight is 43F, the daily normal low is 32F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR MARCH 31
HIGH 89 IN 1998 [RECORD HIGH FOR MONTH]LOW 16 IN 1923
PRECIP 2.89 IN 1987
SNOWFALL 15.0 IN 1997
PEAK GUST 81 MPH SSE IN 1987
RECORDS FOR APRIL 1
HIGH 74 IN 1967
LOW 6 IN 1923 [RECORD FOR MONTH]PRECIP 3.47 IN. IN 2004 [RECORD FOR MONTH]SNOWFALL 15.0 IN. IN 1997 [RECORD FOR MONTH]PEAK GUST 75 MPH SSW IN 1962
TODAY’S REPORT PREPARED BY: Matt Douglas
