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Thursday, April 17, 2025

April 17, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, APRIL 17, 2025 ALL TIMES ARE…

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

THURSDAY, APRIL 17, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0500E
SUNSET:  1828E

PLENTY OF SUNSHINE AND A BIT MILDER WITH A BRISK WIND CONTINUING….

Today has featured plenty of bright sunshine with only a few low
level clouds starting to dot the sky by the early afternoon hours.
Overall it’s been a much more pleasant day than yesterday as
temperatures are a bit milder and the wind a bit less intense.

Temperatures have made it to near average levels for today.
Readings have only made it to the mid to upper 50s early this
afternoon after starting out in the mid 30s. Dew point values have
been generally holding in the low 30s, indicating that a
relatively dry air mass is in place (as reflected by excellent
visibility again today).

Winds have been a bit less busy out of mainly a westerly direction.
The average speed for the day so far is around 14mph. Gusts have
been exceeding 20mph regularly, but this is still less than what
we were experiencing yesterday. The peak gust for the day so far
is 32mph, which occurred after 10:30am this morning.

Visibility has been excellent today with a view of 70-80 miles
throughout the day.

The maximum temperature for today is 59F degrees, which is 2
degrees above the normal high of 57F. The minimum temperature
since midnight is 35F degrees, which is 4 degrees below the
normal low of 39F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant WSW-N, few cirrus distant
NE-ESE
Temperature: 41F; Dew Point: 31F; Relative Humidity: 66%
Wind: WNW @ 13G22 kts
Sea-level pressure: 1015.4 mb; 29.99 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 41F
6-hr Min temp: 35F
24-hr Precip:  Trace
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 70 154/41/31/3013G22/999/ FEW SC DSNT WSW-N
FEW CI DSNT NE-ESE/ 8/501 51020 70000 10041 20035

10 A.M.
Weather: Clear, few stratocumulus distant SW-NW-NE
Temperature: 52F; Dew Point: 32F; Relative Humidity: 46%
Wind: WNW @ 13G22 kts
Sea-level pressure: 1016.2 mb; 30.01 in. Hg: rising, then steady
Visibility: 70 miles
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 70 162/52/32/3013G22/001/ FEW SC DSNT SW-NW-NE/
8/500 51008

1 P.M.
Weather: Clear, few stratocumulus distant SW-NNW and distant ESE-S,
smoke plumes distant SE
Temperature: 57F Dew Point: 30F; Relative Humidity: 35%
Wind: W @ 10G19 kts
Sea-level pressure: 1015.5 mb; 29.99 in. Hg: falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 57F
6-hr Min temp: 30F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 CLR 80 155/57/30/2810G19/999/ FEW SC DSNT SW-NNW AND
DSNT ESE-S K PLUMES DSNT SE/ 8/500 58007 10059 20041

————————————————————–

SUMMARY FOR WEDNESDAY, APRIL 16, 2025

TEMPERATURE (DEGREES F)
MAX…….51   NORMAL…..57
MIN…….37   NORMAL…..38
MEAN……44   NORMAL…..47

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………-3
TOTAL DEPARTURE FOR THE MONTH……………………..-28 [-2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….21  DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE MONTH……………361  DEPARTURE…….+26
TOTAL HEATING UNITS FOR THE SEASON………….5290  DEPARTURE……-391
TOTAL HEATING UNITS LAST SEASON TO DATE……..4933  DEPARTURE……+357

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated

F420C (Official)………..44 WNW  @   02:46 A.M.
VECTOR #1 (1-Sec)……….43 WNW  @   02:45 A.M.
VECTOR #2 (1-Sec)……….43 WNW  @   02:47 A.M.
DAVIS #1……………….43 WNW  @   02:46 A.M.
DAVIS #2 ………………43 W    @   07:05 A.M.
RMY #1 (Instantaneous)…..47 WNW  @   02:45 A.M.
RMY #2 (Instantaneous)…..46 WNW  @   01:07 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………30 W    @   04:23 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..29      @   06:28 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..30      @   12:54 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………32 W    @   06:29 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………31 WNW  @   12:54 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..28 WNW  @   06:28 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..30 WNW  @   06:27 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..19.9 WNW [478 total miles] VECTOR #1………………18.9
VECTOR #2………………20.0
DAVIS #1……………….20.1 W
DAVIS #2……………….20.1 WNW
RMY #1…………………17.8 WNW
RMY #2…………………19.4 W
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH…………..2.62 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE YEAR (2025)…….13.33 DEPARTURE…..-3.42

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE MONTH………………..1.7 DEPARTURE……-0.6
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……35.8 DEPARTURE…..-33.4

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY:  R.M. Young #1 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    55/32/44/+3/0.17/0.0/512/67       38 NW  VEC1 38 NW  RMY 40
4/2    42/27/35/-6/0.11/T/584/76         29 NNW VEC1 28 NNW RMY 29
4/3    62/32/47/+5/0.31/0.0/000/00       38 SW  VEC1 38 SW  RMY 39
4/4    69/47/58/+16/0.00/0.0/456/59      31 NW  VEC1 31 NW  RMY 30
4/5    47/36/42/-1/0.49/0.0/000/00       25 ESE VEC1 29 SE  RMY 25
4/6    51/37/44/+1/0.20/0.0/016/02       22 NNW VEC1 21 NNW RMY 21
4/7    45/34/40/-4/0.18/T/000/00         24 E   VEC1 23 NNE RMY 23
4/8    40/26/33/-11/0.10/0.1/196/25      51 W   VEC1 48 W   RMY 51
4/9    46/24/35/-9/0.00/0.0/755/96       36 WNW VEC1 33 NW  RMY 36
4/10   49/29/39/-6/0.01/0.0/569/72       23 SSW VEC1 23 SSW RMY 25
4/11   45/31/38/-7/0.39/1.2/024/03       25 ENE VEC1 27 ENE RMY 26
4/12   36/33/35/-11/0.46/0.4/000/00      39 ENE VEC1 40 E   RMY 42
4/13   42/35/39/-7/0.16/0.0/000/00       38 NE  VEC1 38 NE  RMY 40
4/14   67/35/51/+4/0.00/0.0/745/93       29 WNW VEC1 29 NNW RMY 28
4/15   66/44/55/+8/0.04/0.0/209/26       53 NW  VEC1 51 NW  RMY 54 TSTM
4/16   51/37/44/-3/T/0.0/484/60          44 WNW VEC1 43 WNW RMY 47

4/17 The low since midnight is 35F, the daily normal low is 38F.

————————————————————–

APRIL DAILY RECORDS TO DATE

NONE.

————————————————————–

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

RECORDS FOR APRIL 17
HIGH 93 IN 2002
LOW 21 IN 1908
PRECIP 1.68 IN 1954
SNOWFALL 1.0 IN. IN 1899
PEAK GUST 63 MPH ESE IN 2011

RECORDS FOR APRIL 18
HIGH 92 IN 1976
LOW 23 1887
PRECIP 1.48 IN 1954
SNOWFALL 4.3 IN. IN 2020
PEAK GUST 59 MPH S IN 1982

TODAY’S REPORT PREPARED BY: MFD/AK

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Please read the full Policy before accessing Observatory data · Effective January 1, 2025

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Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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