Friday, April 4, 2025

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

FRIDAY, APRIL 4, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0521E
SUNSET:  1814E

A MUCH MILDER AND DRY DAY TODAY….

We were under overcast skies for much of the morning. Despite
the cloudy conditions, temperatures drastically warmed from an
already warm overnight. Temperatures continued to steadily
increase when the anticipated clearing occurred, bringing a very
warm spring day to Blue Hill.

The 7am temperature was already well above our normal maximum for
the day, and at 1pm we were sitting at 68F, which is an impressive
17F degrees above average. Although it’s much warmer than normal,
the record is 76F, which was set back in 2010.

Winds last night into the overnight were out of the southwest but
have since transitioned into a more northwesterly flow. Winds have
been mostly steady, with an average speed for the day so far at around
12mph. The peak gust for the day so far is 31mph, which occurred just
before the final 1pm observation.

Visibility has been pretty decent with around 60 miles throughout
the day.

The maximum temperature for today is 68F degrees, which is 17 degrees
above the normal high of 51F. The minimum temperature since midnight
is 58F degrees, which is 25 degrees above the normal low of 33F.

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Today’s Observations:

7 A.M.
Weather: Overcast stratocumulus
Temperature: 58F; Dew Point: 41F; Relative Humidity: 53%
Wind: WNW @ 10 kts
Sea-level pressure: 1022.8 mb; 30.20 in. Hg: rising, then more
slowly
Visibility: 60 miles
6-hr Max temp: 61F
6-hr Min temp: 58F
24-hr Precip:  0.18 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E90 OVC 60 174/58/41/2810/004/ 8/05/ 51020 70018
10061 20058

10 A.M.
Weather: Broken altocumulus, overcast cirrostratus, sun dimly visible
Temperature: 62F; Dew Point: 40F; Relative Humidity: 44%
Wind: WNW @ 11 kts
Sea-level pressure: 1019.5 mb; 30.11 in. Hg: rising unsteadily
Visibility: 60 miles
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E130 BKN 220 OVC 60 189/62/40/2911/009/ SUN DMLY VSBL/
8/057 52015

1 P.M.
Weather: Broken cirrus, few altocumulus ESE-S-SSW, smoke plume E
Temperature: 67F Dew Point: 34F; Relative Humidity: 29%
Wind: NW @ 11 kts, peak wind NW 31mph at 12:53 P.M.
Sea-level pressure: 1018.8 mb; 30.09 in. Hg: falling, then rising
Visibility: 60 miles
6-hr Max temp: 68F
6-hr Min temp: 58F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E220 BKN 60 188/67/34/3211/009/ FEW AC ESE-S-SSW
K PLUME E PK WND 3127/53/ 8/054 55001 10068 20058

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SUMMARY FOR THURSDAY, APRIL 3, 2025

TEMPERATURE (DEGREES F)
MAX…….62   NORMAL…..51
MIN…….32   NORMAL…..33
MEAN……47   NORMAL…..42

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+5
TOTAL DEPARTURE FOR THE MONTH……………………..+2 [+0.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….18  DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH…………….69  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE SEASON………….4998  DEPARTURE……-420
TOTAL HEATING UNITS LAST SEASON TO DATE……..4709  DEPARTURE……+289

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)………..38 SW   @   04:42 P.M.
VECTOR #1 (1-Sec)……….38 SW   @   04:42 P.M.
VECTOR #2 (1-Sec)……….40 SW   @   04:39 P.M.
DAVIS #1……………….38 S    @   07:38 A.M.
DAVIS #2 ………………43 S    @   07:41 A.M.
RMY #1 (Instantaneous)…..39 SW   @   04:42 P.M.
RMY #2 (Instantaneous)…..42 SW   @   04:39 P.M.
MERLIN…………………35 SW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………26 SW   @   04:43 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..28      @   04:42 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..28      @   04:43 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………27 SW   @   04:43 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………31 S    @   07:54 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..27 SW   @   04:43 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..28 SW   @   04:43 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..16.9 SW [405 total miles] VECTOR #1………………16.7
VECTOR #2………………17.2
DAVIS #1……………….16.3 SSW
DAVIS #2……………….17.0 SSW
RMY #1…………………16.2 SSW
RMY #2…………………17.3 S
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.18 DEPARTURE…..+0.01
TOTAL PRECIPITATION FOR THE MONTH…………..0.59 DEPARTURE…..+0.09
TOTAL PRECIPITATION FOR THE YEAR (2025)…….11.30 DEPARTURE…..-3.22

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.2
TOTAL SNOWFALL FOR THE MONTH………………TRACE DEPARTURE……-0.6
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……34.1 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
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/+5/0.18/0.0/…/..       38 SW  VEC1 38 SW  RMY 39

4/4 The low since midnight is 58F, the daily normal low is 33F.

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APRIL DAILY RECORDS TO DATE

NONE.

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

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

RECORDS FOR APRIL 5
HIGH 81 IN 1928
LOW 15 IN 1995
PRECIP 2.15 IN. IN 1987
SNOWFALL 4.0 IN. IN 1898
PEAK GUST 76 MPH WNW IN 1963

TODAY’S REPORT PREPARED BY: Amanda Joly