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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, APRIL 22, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0454E
SUNSET: 1833E
WINDY AND COLD WITH SOME FLURRIES THIS MORNING….
Wind is very active today with a max speed over 45 mph.
This is a westerly breeze with an average speed over
25 mph. There were some flurries this morning, leaving
no measurable snowfall. Despite it being very chilly,
we have had multiple rooftop tours. We are open until
4 P.M., and visibility is still good at around 70 miles.
The high so far today is 42F, this is 16 degrees below the
normal high of 58F. The low since midnight is 28F, which
is 12 degrees below the daily normal low of 40F.
The low temperature of 28F this morning was only two degrees
above the record low for the date of 26F set in 1981.
Today’s Observations:
7 A.M.
Weather: Scattered stratocumulus
Temperature: 33F; Dew Point: 17F; Relative Humidity: 51%
Wind: W at 18G25 kts, peak of 35 mph W at 6:34 A.M.
Sea-level pressure: 29.63 in Hg, rising steadily
Visibility: 80 miles
6-hr Max temp: 33F
6-hr Min temp: 28F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0.0 ins.
BHO SA 1155 50 SCT 80 034/33/17/2818G25/963/ PK WND 2730/34/
8/800 51016 10033 20028
10 A.M.
Weather: Broken stratocumulus, very light snow
beginning at 9:50 A.M.
Temperature: 37F; Dew Point: 20F; Relative Humidity: 49%
Wind: W @ 20G36 kts, peak of 44 mph W at 9:15 A.M.
Sea-level pressure: 29.64 in Hg; rising, then slowly
Visibility: 75 miles
3-hr Precip: Trace
3-hr Snow: Trace
BHO SA 1455 50 BKN 75 039/37/20/2720G36/964/ S-B50 PCPN VRY
LGT NEW SNW PST 3 HRS TRACE PK WND 2739/15/ 8/800 600// 53005
1 P.M.
Weather: Broken stratocumulus and cirrostratus
Temperature: 40F, Dew point: 16F; Relative Humidity: 37%
Wind: W @ 25G38 kts, peak wind W 48 mph at 12:34 P.M.
Sea-level pressure: 29.63 in Hg; falling steadily
Visibility: 60 miles
6-hr Max temp: 42F
6-hr Min temp: 33F
6-hr Precip: Trace
6-hr Snow: Trace
Snow Depth: 0 ins.
BHO SA 1755 50 BKN 250 BKN 60 036/40/16/2725G38/963/ NEW
SNW PST 6 HRS TRACE PK WND 2841/34/ 8/808 600// 56003
10042 20033
SUMMARY FOR WEDNESDAY, APRIL 21, 2021
TEMPERATURE (DEGREES F)
MAX…….68 NORMAL…..58
MIN…….32 NORMAL…..40
MEAN……50 NORMAL…..49
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….+1
TOTAL DEPARTURE FOR THE MONTH……………….+43 [+1.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………15 DEPARTURE……-1
TOTAL HEATING UNITS FOR THE MONTH…………..377 DEPARTURE……-45
TOTAL HEATING UNITS FOR THE SEASON…………5199 DEPARTURE…..-706
TOTAL HEATING UNITS LAST SEASON TO DATE…….5320 DEPARTURE…..-121
PEAK WIND GUST (MPH):
420C/Official…………..45 S @ 10:54 A.M.
AEROVANE (south tower)…..51 S @ 11:47 A.M.
ASOS…………………..46 S @ 11:10 A.M.
DAVIS #1……………….46 S @ 11:53 A.M.
DAVIS #2 (south tower)…..54 SSE @ 11:37 A.M.
RMY……………………51 @ 11:07 A.M.
VECTOR…………………53 @ 11:07 A.M.
MERLIN…………………47
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………36 S @ 11:08 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….37 S @ 11:10 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………37 S @ 11:09 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………41 S @ 11:05 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..36 S @ 11:06 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..36 @ 11:07 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……17.8 S [428 total miles] ASOS…………………17.0
DAVIS #1……………..16.9 SSW
DAVIS #2……………..18.7 SW
RMY………………….17.2 SW
VECTOR……………… 17.8
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.48 DEPARTURE….-0.35
ASOS………….0.49
TOTAL PRECIPITATION FOR THE MONTH………….4.01 DEPARTURE….+0.67
ASOS………….3.91
TOTAL PRECIPITATION FOR THE YEAR………….14.18 DEPARTURE….-3.15
ASOS………..14.42
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0 DEPARTURE…..-0.1
TOTAL SNOWFALL FOR THE MONTH ………………3.6 DEPARTURE…..+1.0
TOTAL SNOWFALL FOR THE SEASON……………..76.2 DEPARTURE….+14.4
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/000/00 44 NW AERO 51 NW RMY 49
04/02 37/24/31/-10/0.00/0.0/614/80 28 NW AERO 32 NNW RMY 30
04/03 48/23/36/-6/0.00/0.0/755/98 24 NW AERO 25 NW RMY 26
04/04 58/33/46/+4/0.00/0.0/734/95 38 NNW AERO 41 NNW RMY 41
04/05 57/41/49/+6/T/T/031/04 41 NNW AERO 48 NNW RMY 50
04/06 61/40/51/+8/0.00/0.0/412/53 26 NNW AERO 25 NNW RMY 31
04/07 57/41/49/+6/0.00/0.0/391/50 23 ENE AERO 21 ENE RMY 22
04/08 59/43/51/+7/0.00/0.0/745/95 22 ENE AERO 22 ENE RMY 24
04/09 69/42/56/+12/0.00/0.0/707/90 24 S AERO M M RMY 26
04/10 75/43/59/+14/0.00/0.0/576/73 26 SSW AERO 28 SSW RMY 30
04/11 53/40/47/+2/T/0.0/000/00 33 ENE AERO 33 ENE RMY 34
04/12 46/37/42/-3/0.05/0.0/000/00 36 ENE AERO 37 ENE RMY 41
04/13 56/37/47/+1/T/0.0/…/.. 31 NE AERO 30 NE RMY 33
04/14 56/42/49/+3/0.00/0.0/…/.. 22 ESE AERO 23 ESE RMY 22
04/15 51/37/44/-3/0.30/0.0/…/.. 26 ESE AERO 25 ESE RMY 28
04/16 39/31/35/-12/2.22/3.6/…/.. 48 NNW AERO 58 NNW RMY 58
04/17 45/34/40/-7/0.07/T/…/.. 27 NNW AERO 30 NNW RMY 29
04/18 60/38/49/+1/0.00/0.0/…/.. 28 NW AERO 28 NW RMY 31
04/19 66/44/55/+7/T/0.0/…/.. 22 SSW AERO 25 SSW RMY 28
04/20 72/45/59/+10/0.00/0.0/…/.. 38 SW AERO 37 WSW RMY 40
04/21 68/32/50/+1/0.48/…/…/.. 45 S AERO 51 S RMY 51
04/22 The low since midnight is 28F, the daily normal low is 40F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR APRIL 22
HIGH 85 IN 1977, 2001
LOW 26 IN 1981
PRECIP 2.60 IN. IN 2019
SNOWFALL 3.0 IN. IN 1940
PEAK GUST 68e MPH NW IN 1945
RECORDS FOR APRIL 23
HIGH 85 IN 1908, 2007
LOW 25 IN 1933,1989
PRECIP 1.99 IN. IN 2012
SNOWFALL 0.5 IN. IN 1911, 1956
PEAK GUST 64 MPH WNW IN 1962
TODAY’S REPORT PREPARED BY: Benjamin Turner
