Tuesday, March 30, 2021

| March 31, 2021 | Reply

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

TUESDAY, MARCH 30, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0530E
SUNSET:  1808E

ANOTHER FAIR WEATHER DAY WITH LESS WIND AND
CLEAR SKIES THIS MORNING….

Today we observed clear skies with less wind in comparison
to yesterday. Wind is southerly today with an average speed
slightly above 10 mph, but we saw a peak gust of 25 mph in
the afternoon hours. Visibility was very good at 75 miles
with a max of 80 miles this morning. Pressure rose
significantly overnight, rising by more than 15 millibars!  

The high so far today is 57F, 8 degrees above the normal
high of 49F. The low since midnight is 31F, which
is the daily normal low.


Today’s Observations:

7 A.M.
Weather: Clear
Temperature: 36F; Dew Point: 17F; Relative Humidity: 45%
Wind: WNW @ 5 kts, light
Sea-level pressure: 30.42 in Hg, rising steadily
Visibility: 80 miles
6-hr Max temp: 36F
6-hr Min temp: 31F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 80 300/36/17/3005/042/ WND LGT/ 53017
10036 20031

10 A.M.
Weather: Clear
Temperature: 48F; Dew Point: 21F; Relative Humidity: 33%
Wind: S @ 7 kts
Sea-level pressure: 30.44 in Hg; rising unsteadily
Visibility: 75 miles
3-hr Precip: 0.00 ins
3-hr Snow: 0.0 ins.
BHO SA 1455 CLR 75 307/48/21/1807/044/ 52007

1 P.M.
Weather: Scattered cirrostratus
Temperature: 54F, Dew point: 25F; Relative Humidity: 31%
Wind: S @ 11G25 kts
Sea-level pressure: 30.40 in Hg; falling steadily
Visibility: 75 miles
6-hr Max temp: 57F
6-hr Min temp: 36F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 250 SCT 75 294/54/25/1911G25/040/ 8/006 58013
10057 20036


SUMMARY FOR MONDAY, MARCH 29, 2021

TEMPERATURE (DEGREES F)
MAX…….50     NORMAL…..49
MIN…….35     NORMAL…..31
MEAN……43     NORMAL…..40

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……. +3
TOTAL DEPARTURE FOR THE MONTH………………. +119 [+3.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………22  DEPARTURE……-3
TOTAL HEATING UNITS FOR THE MONTH…………..747  DEPARTURE…..-120
TOTAL HEATING UNITS FOR THE SEASON…………4792  DEPARTURE…..-642
TOTAL HEATING UNITS LAST SEASON TO DATE…….4815  DEPARTURE……-23

PEAK WIND GUST (MPH):
                     420C/Official…………..58 WNW @ 10:21 A.M.
                     AEROVANE (south tower)…..62 WNW @  9:13 A.M.
                     ASOS…………………..57 WNW @ 10:23 A.M.
                     DAVIS #1……………….58 W   @  4:38 A.M.
                     DAVIS #2 (south tower)…..56 W   @  3:32 A.M.
                     RMY……………………63     @ 10:22 A.M.
                     VECTOR…………………64     @  8:36 A.M.
                     MERLIN…………………M

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………44 WNW @ 10:21 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….39 W   @  8:37 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………43 WNW @  8:37 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………43 WNW @  9:15 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..37 WNW @  8:34 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..39     @  9:15 A.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……21.5 W [517 total miles]
                     ASOS…………………20.7  
                     DAVIS #1……………..21.8 WNW  
                     DAVIS #2……………..21.8 WNW
                     RMY………………….19.1 WNW
                     VECTOR……………….20.4

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….-3.36
                             ASOS………….1.94
TOTAL PRECIPITATION FOR THE YEAR…………..9.86  DEPARTURE….-3.78
                              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….-12.0
TOTAL SNOWFALL FOR THE SEASON……………..72.6  DEPARTURE….+13.9


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/…./0.0/…/..     22 SSE  AERO 21 SSE  RMY 21
03/25   67/49/58/+20/0.11/0.0/…/..     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 The low since midnight is 31F, the daily normal low is 31F


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

RECORDS FOR MARCH 30
HIGH 83 IN 1977
LOW 10 IN 1887
PRECIP 2.92 INS. IN 2010
SNOWFALL 3.9 INS. IN 1957
PEAK GUST 60 MPH NW IN 1999

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

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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