Sunday, April 9, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, APRIL 9, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0513E
SUNSET: 1819E
ABUNDANT SUNSHINE, LIGHT WIND, AND SEASONABLE TEMPERATURES ON
THIS EASTER SUNDAY…
What a spectacular day for Easter! Plenty of sunshine has been
the theme along with generally light wind and dry air. The dew-
point has been in the teens, so the air has a slight chill to
it, but the abundance of sunshine and lack of wind nicely
overcomes this.
The temperature has made it to the low 50s into early this
afternoon, which is a touch below normal for the date.
As mentioned, the wind has been quite light with an average
speed of around 8mph for the day so far. The peak gust occurred
around 2am this morning with a value of 21mph.
Visibility has been excellent today, holding at around 70-80
miles.
The high so far today is 51F, which is 2F degrees below the
normal maximum of 53F. The low since midnight is 33F degrees,
which is 2 degrees below the normal minimum for the day of 35F.
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Today’s Observations:
7 A.M.
Weather: Clear, few cirrus all quadrants
Temperature: 38F; Dew Point: 25F; Relative Humidity: 57%
Wind: NE @ 5 kts, wind light
Sea-level pressure: 1034.7 mb; 30.56 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 38F
6-hr Min temp: 33F
24-hr Precip: 0.00
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 70 347/38/25/0505/056/ FEW CI ALQDS WND LGT/ 8/004
51023 10038 20033
10 A.M.
Weather: Clear, few cirrus distant E-S-SW
Temperature: 45F; Dew Point: 16F; Relative Humidity: 31%
Wind: NE @ 5 kts, wind light and variable
Sea-level pressure: 1035.1 mb; 30.57 in. Hg: steady, then rising
Visibility: 70 miles
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 70 351/45/16/0505/057/ FEW CI DSNT E-S-SW
WND L/V/ 8/001 53004
1 P.M.
Weather: Clear, few small cumulus all quadrants
Temperature: 50F; Dew Point: 18F; Relative Humidity: 28%
Wind: S @ 6 kts, wind light and variable
Sea-level pressure: 1033.4 mb; 30.52 in. Hg: falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 51F
6-hr Min temp: 38F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 80 334/50/18/1906/052/ FEW SML CU ALQDS
WND L/V/ 8/100 58017 10051 20038
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SUMMARY FOR SATURDAY, APRIL 8, 2023
TEMPERATURE (DEGREES F)
MAX…….50 NORMAL…..53
MIN…….29 NORMAL…..35
MEAN……40 NORMAL…..44
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-4
TOTAL DEPARTURE FOR THE MONTH…………………+19 [+2.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………25 DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE MONTH…………..161 DEPARTURE…….-20
TOTAL HEATING UNITS FOR THE SEASON…………4693 DEPARTURE……-835
TOTAL HEATING UNITS LAST SEASON TO DATE…….5015 DEPARTURE……-322
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
F420C (Official)………..26 NNW @ 1:06 A.M.
VECTOR #1 (1-Sec)……….29 NNW @ 1:19 A.M.
VECTOR #2 (1-Sec)……….32 NNW @ 12:44 A.M.
DAVIS #1……………….28 NNW @ 1:05 A.M.
DAVIS #2 ………………28 NNW @ 1:00 A.M.
RMY #1 (Instantaneous)…..31 NW @ 11:41 A.M.
RMY #2 (Instantaneous)…..34 NNW @ 1:19 A.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……30 @ 11:41 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 NNW @ 12:50 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19 @ 12:47 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19 @ 1:21 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 NW @ 12:48 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 N @ 1:21 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 N @ 12:47 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 NNW @ 1:21 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………19 @ 12:47 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..9.0 NNW [216 total miles]
VECTOR #1………………9.1
VECTOR #2………………9.4
DAVIS #1……………….9.1 NNW
DAVIS #2……………….9.2 N
RMY #1…………………8.9 NNW
RMY #2…………………9.3 NNW
RICHARDS (C5C)………….9.5
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..0.00 DEPARTURE…..-0.92
TOTAL PRECIPITATION FOR THE YEAR…………..15.04 DEPARTURE…..-0.33
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE……-1.4
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-33.4
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PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
VEC1: Vector #1 1-second gust
RMY: R.M. Young wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
4/1 60/39/50/+9/0.39/0.0/145/19 36 SW VEC1 40 SW RMY 41
4/2 50/30/40/-1/0.00/0.0/636/83 40 NNW VEC1 44 NNW RMY 45
4/3 51/28/40/-2/0.00/0.0/737/96 41 SSW VEC1 46 SSW RMY 46
4/4 62/40/51/+9/0.00/0.0/594/77 26 ENE VEC1 26 ENE RMY 27
4/5 45/37/41/-2/0.02/0.0/000/00 33 ENE VEC1 34 ENE RMY 37
4/6 62/37/50/+7/0.02/0.0/…/.. 26 NW VEC1 28 NNW RMY 29
4/7 58/36/47/+3/0.00/0.0/…/.. 45 WNW VEC1 48 WNW RMY 52
4/8 50/29/40/-4/0.00/0.0/…/.. 26 NNW VEC1 29 NNW RMY 31
4/9 The low since midnight is 33F, the daily normal low is 35F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR APRIL 9
HIGH 83 IN 1991
LOW 18 IN 1888
PRECIP 2.38 IN. IN 1935
SNOWFALL 11.0 IN. IN 1917
PEAK GUST 72 MPH WNW IN 1962
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: Matt Douglas
