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Saturday, April 10, 2021

April 10, 2021

BLUE HILL METEOROLOGICAL OBSERVATORYMILTON, MASSACHUSETTSELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, APRIL 10, 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

SATURDAY, APRIL 10, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0512E
SUNSET:  1820E

THE WARMER THAN NORMAL TREND CONTINUES….

Another red square on the calendar to start the weekend!
The day consisted of mostly cloudy skies and a light
southwesterly wind, bringing in higher than usual
temperatures. Visibility was good for the most part,
holding at around 70 miles.  

The high so far today is 74F, this is 11 degrees above
the normal high of 53F. The low since midnight is 43F,
which is 7 degrees above the daily normal low of 36F.


Today’s Observations:

7 A.M.
Weather: Broken altocumulus and cirrostratus
Temperature: 48F; Dew Point: 43F; Relative Humidity: 78%
Wind: SSW at 8 kts
Sea-level pressure: 30.02 in Hg, falling unsteadily
Visibility: 70 miles
6-hr Max temp: 48F
6-hr Min temp: 44F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 80 BKN 220 BKN 70 166/48/43/2008/002/ 8/076
57009 10048 20044

10 A.M.
Weather: Scattered cumulus and altocumulus, broken
cirrostratus
Temperature: 61F; Dew Point: 47F; Relative Humidity: 60%
Wind: WSW @ 7 kts (wind light and variable)
Sea-level pressure: 30.01 in Hg; falling steadily
Visibility: 70 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 40 SCT 120 SCT 250 BKN 70 162/61/47/2407/001/
8/186 58004

1 P.M.
Weather: Broken cumulus and cirrostratus
Temperature: 72F, Dew point: 50F; Relative Humidity: 46%
Wind: WSW @ 7 kts
Sea-level pressure: 29.89 in Hg; falling steadily
Visibility: 65 miles
6-hr Max temp: 74F
6-hr Min temp: 48F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 40 BKN 250 BKN 65 125/72/50/2407/989/ 8/108 56037
10074 20048


SUMMARY FOR FRIDAY, APRIL 9, 2021

TEMPERATURE (DEGREES F)
MAX…….69     NORMAL…..53
MIN…….42     NORMAL…..35
MEAN……56     NORMAL…..44

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….+12
TOTAL DEPARTURE FOR THE MONTH……………….+29 [+3.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………….9  DEPARTURE……-12
TOTAL HEATING UNITS FOR THE MONTH…………..173  DEPARTURE……-29
TOTAL HEATING UNITS FOR THE SEASON…………4995  DEPARTURE…..-690
TOTAL HEATING UNITS LAST SEASON TO DATE…….5063  DEPARTURE……-68

PEAK WIND GUST (MPH):
                     420C/Official…………..24 S   @  6:53 P.M.
                     AEROVANE (south tower)…..MISSING
                     ASOS…………………..24 S   @  6:52 P.M.
                     DAVIS #1……………….25 S   @  6:43 P.M.
                     DAVIS #2 (south tower)…..24 SSE @  5:56 P.M.
                     RMY……………………26     @  6:52 P.M.
                     VECTOR…………………27     @  6:51 P.M.
                     MERLIN…………………23

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 S   @  6:24 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 S   @  4:53 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 S   @  4:54 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 S   @  5:57 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..16 SSW @  4:51 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..17     @  4:51 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……..7.2 S [173 total miles]                     ASOS…………………..8.2  
                     DAVIS #1……………….7.3 SSW  
                     DAVIS #2……………….7.7 SSW
                     RMY……………………7.4 SSW
                     VECTOR…………………7.9

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….-0.63
                             ASOS………….0.87
TOTAL PRECIPITATION FOR THE YEAR………….11.06  DEPARTURE….-4.45
                              ASOS………..11.38

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0  DEPARTURE…. -0.1
TOTAL SNOWFALL FOR THE MONTH …………….TRACE  DEPARTURE…..-1.5
TOTAL SNOWFALL FOR THE SEASON……………..72.6  DEPARTURE….+11.9


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/-10/0.00/0.0/…/..     28 NW   AERO 32 NNW  RMY 30
04/03   48/23/36/-6/0.00/0.0/…/..      24 NW   AERO 25 NW   RMY 26
04/04   58/33/46/+4/0.00/0.0/…/..      38 NNW  AERO 41 NNW  RMY 41
04/05   57/41/49/+6/T/T/…/..           41 NNW  AERO 48 NNW  RMY 50
04/06   61/40/51/+8/0.00/0.0/…/..      26 NNW  AERO 25 NNW  RMY 31
04/07   57/41/49/+6/0.00/0.0/…/..      23 ENE  AERO 21 ENE  RMY 22
04/08   59/43/51/+7/0.00/0.0/…/..      22 ENE  AERO 22 ENE  RMY 24
04/09   69/42/56/+12/0.00/0.0/…/..     24 S    AERO  M   M  RMY 26

04/10   The low since midnight is 43F, the daily normal low is 36F


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

RECORDS FOR APRIL 11
HIGH 85 IN 2017
LOW 19 IN 1909
PRECIP 1.72 IN. IN 2003
SNOWFALL 9.5 IN. IN 1958
PEAK GUST 65 MPH NW IN 1963

RECORDS FOR APRIL 10
HIGH 83 IN 1922
LOW 20 IN 1985
PRECIP 2.40 IN. IN 1935
SNOWFALL 10.1 IN. IN 1996
PEAK GUST 66 MPH WNW IN 1967

TODAY’S REPORT PREPARED BY: Benjamin Turner

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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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All observational records, compiled datasets, metadata, database structures, and related materials provided by the Blue Hill Observatory & Science Center are the exclusive property of the Blue Hill Observatory & Science Center. The Observatory has maintained continuous weather observations at the summit of Great Blue Hill since 1885, and the entirety of that record — its compilation, structure, curation, and organization — constitutes a proprietary database protected under applicable United States law, including copyright law and common law database protections.

All rights not expressly granted in this Policy are reserved by the Observatory. No access to or use of Observatory data shall be construed as a waiver of any rights or as a license to use data beyond the scope expressly stated herein.

§ 02

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§ 03

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§ 04

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§ 05

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§ 06

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§ 07

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§ 08

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§ 13

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§ 17–20

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Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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