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Wednesday, March 31, 2021

March 31, 2021

BLUE HILL METEOROLOGICAL OBSERVATORYMILTON, MASSACHUSETTSELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA WEDNESDAY, MARCH 31, 2021ALL TIMES ARE IN EASTERN STANDARD…

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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

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

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