Saturday, April 3, 2021

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

SATURDAY, APRIL 3, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0523E
SUNSET:  1812E

A FAIR WEATHER DAY WITH COOLER TEMPERATURES AND
EXCELLENT VISIBILITY….

We observed fair, yet still colder than normal weather today
at the summit. Visibility was excellent at 80 miles all day,
and skies were almost clear save some distant cumulus offshore.
Wind is northwesterly at an average of 10 mph, with a max gust
a little over 20 mph. Conditions are very dry, considering a
humidity of 19% was measured at the 1 P.M. observation.

The high today so far today is 45F, this is 6 degrees below
the normal high of 51F. The low since midnight is 23F, which
is 10 degrees below the daily normal low of 33F.

Today’s Observations:

7 A.M.
Weather: Clear, few cumulus NNE-SE
Temperature: 28F; Dew Point: 15F; Relative Humidity: 58%
Wind: WNW @ 5 kts, light
Sea-level pressure: 30.29 in Hg, rising steadily
Visibility: 80 miles
6-hr Max temp: 27F
6-hr Min temp: 23F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 80 258/28/15/2905/029/ FEW CU NNE-SE WND LGT/ 8/100
51020 10027 20023

10 A.M.
Weather: Clear, few cumulus NNE-SE
Temperature: 38F; Dew Point: 10F; Relative Humidity: 31%
Wind: WNW @ 9G20 kts
Sea-level pressure: 30.26 in Hg; falling steadily
Visibility: 80 miles
3-hr Precip: 0.00 ins
3-hr Snow: 0.0 ins.
BHO SA 1455 CLR 80 249/38/10/2909G20/026/ FEW CU NNE-SE/
8/100 58009

1 P.M.
Weather: Clear, few cumulus NE-SE
Temperature: 45F, Dew point: 5F; Relative Humidity: 19%
Wind: NNW @ 8G17 kts
Sea-level pressure: 30.22 in Hg; falling steadily
Visibility: 80 miles
6-hr Max temp: 45F
6-hr Min temp: 28F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 80 236/45/5/3308G17/022/ FEW CU NE-SE/ 8/100
58013 10045 20028

SUMMARY FOR FRIDAY, APRIL 2, 2021

TEMPERATURE (DEGREES F)
MAX…….37     NORMAL…..50
MIN…….24     NORMAL…..33
MEAN……31     NORMAL…..41

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……-10
TOTAL DEPARTURE FOR THE MONTH……………….-8 [-4.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………34  DEPARTURE……+10
TOTAL HEATING UNITS FOR THE MONTH……………56  DEPARTURE…….+8
TOTAL HEATING UNITS FOR THE SEASON…………4878  DEPARTURE…..-654
TOTAL HEATING UNITS LAST SEASON TO DATE…….4927  DEPARTURE……-49

PEAK WIND GUST (MPH):
                     420C/Official…………..28 NW  @  4:42 A.M.
                     AEROVANE (south tower)…..32 NNW @ 12:45 A.M.
                     ASOS…………………..27 NNW @  4:40 A.M.
                     DAVIS #1……………….28 NNW @ 12:36 A.M.
                     DAVIS #2 (south tower)…..29 NW  @ 12:48 A.M.
                     RMY……………………30     @  1:35 A.M.
                     VECTOR…………………32     @ 12:36 A.M.
                     MERLIN…………………N/A

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 NW  @  4:48 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 NW  @  4:47 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 NNW @  4:42 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 NW  @  4:47 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..19 NNW @  4:40 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..20     @  4:40 A.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……11.5 NW [276 total miles]                     ASOS…………………11.4  
                     DAVIS #1……………..11.8 NW  
                     DAVIS #2……………..11.7 NW
                     RMY………………….10.8 NW
                     VECTOR……………….11.5

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00  DEPARTURE….-0.17
                             ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….0.89  DEPARTURE….+0.55
                             ASOS………….0.87
TOTAL PRECIPITATION FOR THE YEAR………….11.06  DEPARTURE….-3.27
                              ASOS………..11.38

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0  DEPARTURE…. -0.2
TOTAL SNOWFALL FOR THE MONTH ………………0.0  DEPARTURE…..-0.4
TOTAL SNOWFALL FOR THE SEASON……………..72.6  DEPARTURE….+13.0

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/628/90          32 WNW  AERO 35 WNW  RMY 37
03/10   54/32/43/+10/0.00/0.0/666/95     29 SSW  AERO 29 SSW  RMY 31
03/11   71/35/53/+19/0.00/0.0/218/31     41 SSW  AERO 43 SSW  RMY 46
03/12   62/42/52/+18/0.00/0.0/614/87     52 WNW  AERO 59 WNW  RMY 57
03/13   46/27/37/+3/0.00/0.0/696/98      53 WNW  AERO 59 WNW  RMY 57
03/14   45/19/32/-3/0.01/0.1/449/63      51 WNW  AERO 58 NW   RMY 58
03/15   27/12/20/-15/0.00/0.0/694/97     48 NW   AERO 47 NW   RMY 54
03/16   37/13/25/-10/0.00/0.0/352/49     22 NNW  AERO 22 NNW  RMY 23
03/17   52/27/40/+4/0.00/0.0/483/67      28 S    AERO 25 S    RMY 29
03/18   46/34/40/+4/0.80/T/000/00        38 NE   AERO 40 NE   RMY 42
03/19   39/26/33/-3/T/T/683/94           37 N    AERO 38 N    RMY 41
03/20   58/24/41/+4/0.00/0.0/701/96      23 W    AERO 23 W    RMY 27
03/21   62/39/51/+14/0.00/0.0/704/96     22 S    AERO 23 S    RMY 25
03/22   62/36/49/+12/0.00/0.0/698/95     21 S    AERO 18 S    RMY 22
03/23   65/38/52/+14/0.00/0.0/568/77     22 ESE  AERO 18 SE   RMY 21
03/24   63/44/54/+16/0.01/0.0/163/22     22 SSE  AERO 21 SSE  RMY 21
03/25   67/49/58/+20/0.10/0.0/201/27     25 S    AERO 26 S    RMY 26
03/26   63/48/56/+17/0.01/0.0/127/17     58 W    AERO 67 W    RMY 63
03/27   63/40/52/+13/0.00/0.0/608/81     39 WNW  AERO 41 WNW  RMY 44
03/28   56/37/47/+8/0.80/0.0/000/00      40 S    AERO 41 S    RMY 46
03/29   50/35/43/+3/T/0.0/718/95         58 WNW  AERO 62 WNW  RMY 63
03/30   58/31/45/+5/0.00/0.0/720/95      36 S    AERO 36 S    RMY 37
03/31   66/43/55/+14/0.31/0.0/251/33     41 SSW  AERO 45 S    RMY 44

PRELIMINARY CLIMATE SUMMARY FOR APRIL 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

04/01   56/30/43/+2/0.89/T/…/..        44 NW   AERO 51 NW   RMY 49
04/02   37/24/31/-10/…./…/…/..     28 NW   AERO 32 NNW  RMY 30

04/03   The low since midnight is 23F, the daily normal low is 33F

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

RECORDS FOR APRIL 3
HIGH 76 IN 1892
LOW 16 IN 1894
PRECIP 2.18 IN. IN 1990
SNOWFALL 8.0 IN. IN 1915
PEAK GUST 83e MPH NW IN 1977 [RECORD FOR MONTH]

RECORDS FOR APRIL 4
HIGH 76 IN 2010
LOW 12 IN 1954
PRECIP 1.45 IN. IN 1987
SNOWFALL 7.3 IN. IN 2016
PEAK GUST 80 MPH WNW IN 1963

TODAY’S REPORT PREPARED BY: Benjamin Turner