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Sunday, April 6, 2025

April 6, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, APRIL 6, 2025 ALL TIMES ARE…

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

SUNDAY, APRIL 6, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0518E
SUNSET:  1816E

CHILLY AS RAIN CONTINUES INTO EARLY THIS AFTERNOON….

The rain that started mid to late yesterday morning continued to
fall at varying intensities overnight, and now through early this
afternoon. 0.59″ of rain was measured through 7am this morning,
with an additional 0.10″ being measured between 7am and 1pm.

Of course with the rain has been overcast skies and dense fog here
on the summit (we’re technically in the clouds). The fog did
attempt to break for a time around the 10am observation, but
filled back in soon thereafter. However, the fog is attempting to
lift once again just ahead of the 1pm observation.

Temperatures remain on the cooler side, ever so slowly rising from
the mid to upper 30s early this morning to the mid 40s by early
this afternoon. This is below the expected readings for the date,
at least in terms of high temperature.

Winds remain on the light side, with the flow varying between
west-northwest and north-northwest. The average speed so far for
the day is only around 6mph. The peak gust to this point in the
day is 16mph, which occurred just after 6am.

Visibility has of course been limited today with the rain and fog
this morning keeping the view generally under 1 mile. With the fog
lifting again early this afternoon, the view has improved quite a
bit with the view reaching upwards to 25 miles.

The maximum temperature for today is 47F degrees, which is 5 degrees
below the normal high of 52F. The minimum temperature since midnight
is 37F degrees, which is 3 degrees above the normal low of 34F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft, light drizzle
Temperature: 39F; Dew Point: 39F; Relative Humidity: 100%
Wind: NNW @ 6 kts, wind light
Sea-level pressure: 1010.2 mb; 29.83 in. Hg: falling, then rising
Visibility: 1/8 mile, fog
6-hr Max temp: 39F
6-hr Min temp: 38F
24-hr Precip:  0.59 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 X W2 1/8L-F 102/39/39/3306/983/ WND LGT/ 8//// 53003 6010/
70059 10039 20038

10 A.M.
Weather: Overcast nimbostratus, lower stratus fractus all quadrants,
light rain
Temperature: 43F; Dew Point: 43F; Relative Humidity: 100%
Wind: WNW @ 5 kts, wind light
Sea-level pressure: 1008.8 mb; 29.79 in. Hg: steady, then falling
Visibility: 1 mile variable 3 miles, fog
3-hr Precip:  0.09 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E34 OVC 1VR-F 088/43/43/3005/979/ LWR STFRA ALQDS VSBY 1V3
WND LGT/ 8/72/ 58014 6009/

1 P.M.
Weather: Overcast altostratus, few stratus fractus all quadrants
Temperature: 47F Dew Point: 47F; Relative Humidity: 100%
Wind: WNW @ 5 kts, wind light
Sea-level pressure: 1008.8 mb; 29.79 in. Hg: rising, then falling
Visibility: 25 miles, 5 miles ENE-S-SSW and WNW, thin fog
6-hr Max temp: 47F
6-hr Min temp: 39F
6-hr Precip:  0.10 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E55 OVC 25 088/47/47/2905/979/ FEW STFRA ALQDS THN F ALQDS
VSBY 5 ENE-S-SSW AND WNW WND LGT/ 8/62/ 50000 6010/ 10047 20039

————————————————————–

SUMMARY FOR SATURDAY, APRIL 5, 2025

TEMPERATURE (DEGREES F)
MAX…….47   NORMAL…..52
MIN…….36   NORMAL…..34
MEAN……42   NORMAL…..43

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-1
TOTAL DEPARTURE FOR THE MONTH…………………….+17 [+3.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….23  DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH…………….99  DEPARTURE…….-17
TOTAL HEATING UNITS FOR THE SEASON………….5028  DEPARTURE……-435
TOTAL HEATING UNITS LAST SEASON TO DATE……..4767  DEPARTURE……+261

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)………..25 ESE  @   06:56 A.M.
VECTOR #1 (1-Sec)……….29 SE   @   03:28 P.M.
VECTOR #2 (1-Sec)……….26 SE   @   03:22 P.M.
DAVIS #1……………….25 E    @   06:56 A.M.
DAVIS #2 ………………25 SE   @   03:22 P.M.
RMY #1 (Instantaneous)…..25 SE   @   03:28 P.M.
RMY #2 (Instantaneous)…..28 SE   @   03:22 P.M.
MERLIN…………………24 SSE
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 SE   @   03:32 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19      @   03:29 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20      @   03:24 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 E    @   03:29 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 SE   @   03:23 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 SE   @   03:29 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 SE   @   03:24 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.7 ESE [232 total miles] VECTOR #1……………….9.7
VECTOR #2………………10.0
DAVIS #1……………….10.0 ESE
DAVIS #2………………..9.9 ESE
RMY #1………………….9.6 ESE
RMY #2………………….9.9 ESE
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.59 DEPARTURE…..+0.41
TOTAL PRECIPITATION FOR THE MONTH…………..1.18 DEPARTURE…..+0.33
TOTAL PRECIPITATION FOR THE YEAR (2025)…….11.89 DEPARTURE…..-2.98

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE MONTH………………TRACE DEPARTURE……-0.9
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……34.1 DEPARTURE…..-33.7

————————————————————–

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 The low since midnight is 37F, the daily normal low is 34F.

————————————————————–

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 6
HIGH 82 IN 1921
LOW 16 IN 1982
PRE 1.72 INS IN 1886
SNOW 12.3 INS IN 1982
WIND 71e MPH WNW IN 1940

RECORDS FOR APRIL 7
HIGH 90 IN 2010
LOW 13 IN 1982
PRECIP 1.72 IN. IN 1924
SNOWFALL 4.5 IN. IN 1967, 1996
PEAK GUST 65 MPH WNW IN 1982

TODAY’S REPORT PREPARED BY: Matt Douglas

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