Sunday, April 13, 2025

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

SUNDAY, APRIL 13, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0506E
SUNSET:  1824E

ANOTHER CHILLY DREARY DAY HERE AT BLUE HILL….

It’s the weekend, so we all know what that means, poor weather
conditions! We are observing yet another cloudy, cold, and raw
day with periods of drizzle and temperatures that have just
reached the 40F degree mark for the first time since Friday
afternoon! Rain and drizzle yesterday afternoon through the
overnight yielded 0.24″ of water in the gauge through 7am this
morning. An additional 0.01″ has fallen since then. Conditions
have been gradually improving since the late morning hours with
the fog lifting allowing for rather decent visibility considering
the lingering light rain early this afternoon.

As mentioned, temperatures have been on the chilly side only
gradually rising to around 40F by the 1pm observation. Readings
are a solid 15 degrees below normal levels for mid April, with
little overall range between the max and min temperatures over
the past couple of days.

Winds have been gradually decreasing throughout the day today.
A northerly wind has been averaging at around 14mph for the day
so far. The peak gust for the day occurred back in the wee hours
of the day, just before 12:30am with a value of 38mph.

Visibility was poor through most of the morning, generally under
2 miles. But the view has improved markedly off the west and
northwest early this afternoon, upwards to around 60 miles!

The maximum temperature for today is 40F degrees, which is 15
degrees below the normal high of 55F. The minimum temperature
since midnight is 35F degrees, which is 2 degrees below the
normal low of 37F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft, light drizzle
Temperature: 35F; Dew Point: 35F; Relative Humidity: 100%
Wind: N @ 12G21 kts
Sea-level pressure: 1011.4 mb; 29.87 in. Hg: falling, then rising
Visibility: 1/4 mile, 1 mile ESE-SSW, fog
6-hr Max temp: 36F
6-hr Min temp: 35F
24-hr Precip:  0.24 inches
24-hr Snowfall: Trace
Snow Depth: 0 inches
BHO SA 1155 X W2 1/4L-F 114/35/35/0112G21/987/ VSBY 1 ESE-SSW
TOTAL NEW SNW PST 24 HRS TRACE/ 8//// 53001 6011/ 70024 10036 20035

10 A.M.
Weather: Sky obscured, vertical visibility 300ft, light drizzle
Temperature: 36F; Dew Point: 36F; Relative Humidity: 100%
Wind: N @ 10G21 kts
Sea-level pressure: 1010.7 mb; 29.85 in. Hg: falling, then more slowly
Visibility: 2 miles, fog
3-hr Precip:  0.01 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 X W3 2L-F 107/36/36/3510G21/985/ 8//// 56007 6001/

1 P.M.
Weather: Overcast stratocumulus, very light rain
Temperature: 40F Dew Point: 38F; Relative Humidity: 95%
Wind: NNW @ 8G18 kts
Sea-level pressure: 1009.4 mb; 29.81 in. Hg: falling, then more slowly
Visibility: 60 miles, 30 miles NE, 20 miles E-S, thin fog
6-hr Max temp: 40F
6-hr Min temp: 35F
6-hr Precip:  0.01 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E13 OVC 60R- 094/40/38/3408G18/981/ THN F ALQDS
PCPN VRY LGT VSBY 30 NE 20 E-S/ 8/5// 56013 6001/ 10040 20035

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SUMMARY FOR SATURDAY, APRIL 12, 2025

TEMPERATURE (DEGREES F)
MAX…….36   NORMAL…..55
MIN…….33   NORMAL…..37
MEAN……35   NORMAL…..46

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-11
TOTAL DEPARTURE FOR THE MONTH……………………..-30 [-2.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….30  DEPARTURE…….+11
TOTAL HEATING UNITS FOR THE MONTH……………290  DEPARTURE…….+29
TOTAL HEATING UNITS FOR THE SEASON………….5219  DEPARTURE……-389
TOTAL HEATING UNITS LAST SEASON TO DATE……..4886  DEPARTURE……+333

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)………..39 ENE  @   07:09 A.M.
VECTOR #1 (1-Sec)……….40 E    @   07:21 A.M.
VECTOR #2 (1-Sec)……….41 NE   @   04:52 P.M.
DAVIS #1……………….41 E    @   02:06 P.M.
DAVIS #2 ………………38 E    @   07:09 A.M.
RMY #1 (Instantaneous)…..42 NE   @   02:06 P.M.
RMY #2 (Instantaneous)…..43 ENE  @   07:09 A.M.
MERLIN…………………38 ENE
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………30 ENE  @   07:09 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..25      @   04:28 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..27      @   07:09 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………27 E    @   07:09 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………27 E    @   07:09 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..25 ENE  @   07:09 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..26 ENE  @   07:10 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..17.7 NE [424 total miles] VECTOR #1………………16.3
VECTOR #2………………17.3
DAVIS #1……………….17.5 ENE
DAVIS #2……………….17.3 ENE
RMY #1…………………16.1 NE
RMY #2…………………16.8 NE
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.24 DEPARTURE…..+0.06
TOTAL PRECIPITATION FOR THE MONTH…………..2.54 DEPARTURE…..+0.47
TOTAL PRECIPITATION FOR THE YEAR (2025)…….13.25 DEPARTURE…..-2.84

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………TRACE DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE MONTH………………..1.7 DEPARTURE……-0.2
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……35.8 DEPARTURE…..-33.0

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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/+5/0.31/0.0/000/00       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 The low since midnight is 35F, the daily normal low is 37F.

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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 13
HIGH 88 IN 2023
LOW 22 IN 1939
PRECIP 2.51 IN. IN 2004
SNOWFALL 6.8 IN. IN 1933
PEAK GUST 79 MPH S IN 2020

RECORDS FOR APRIL 14
HIGH 88 IN 2023
LOW 21 IN 1923
PRECIP 1.86 IN. IN 1935
SNOWFALL 8.4 IN. IN 1953
PEAK GUST 71e MPH W IN 1943

TODAY’S REPORT PREPARED BY: Matt Douglas