Wednesday, April 23, 2025

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

WEDNESDAY, APRIL 23, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0450E
SUNSET:  1835E

A SPECTACULAR SPRING DAY ONGOING HERE IN LATE APRIL….

Plenty of sunshine, pleasant temperatures, and a drier air mass
has been the theme today. Couple all of this with light wind and
excellent visibility, it’s a near perfect day to be outdoors.

Temperatures have warmed into the upper 60s early this afternoon,
which is around 5-10 degrees above normal levels for this time of
year. Dew point values have been holding in the 30s, indicating
a significantly drier air mass than yesterday. It feels rather
refreshing out there today compared to the humid feel of
yesterday.

The wind has been fairly steady aside for the couple of hours
this morning where they were on the light side. It has also
gradually backed from a northerly to westerly direction through
the course of the morning into early this afternoon. The average
speed so far is around 10mph. The peak gust occurred just after
6am with a value of 23mph.

Visibility has been excellent all day, holding at around 70 miles.

The maximum temperature for today is 69F degrees, which is 9
degrees above the normal high of 60F. The minimum temperature
since midnight is 43F degrees, which is 2 degrees above the
normal low of 41F.

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Today’s Observations:

7 A.M.
Weather: Thin broken cirrus, stratus layer and fog bank offshore
distant NE-ESE
Temperature: 52F; Dew Point: 38F; Relative Humidity: 58%
Wind: NNW @ 10G17 kts
Sea-level pressure: 1021.6 mb; 30.17 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 54F
6-hr Min temp: 43F
24-hr Precip:  0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E250 -BKN 70 216/52/38/3310G17/017/ ST LYR AND F BNK
OFFSHR DSNT NE-ESE/ 8/601 51018 10054 20043

10 A.M.
Weather: Thin broken cirrus
Temperature: 60F; Dew Point: 38F; Relative Humidity: 43%
Wind: NW @ 5 kts, wind light
Sea-level pressure: 1022.5 mb; 30.19 in. Hg: rising, then falling
Visibility: 70 miles
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E250 -BKN 70 225/60/37/3205/019/ WND LGT/ 8/001 50009

1 P.M.
Weather: Thin broken cirrus
Temperature: 68F Dew Point: 34F; Relative Humidity: 29%
Wind: WNW @ 8G16 kts
Sea-level pressure: 1020.8 mb; 30.14 in. Hg: falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 69F
6-hr Min temp: 52F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E250 -BKN 70 208/68/34/3008G16/014/ 8/001 56017 10069 20052

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SUMMARY FOR TUESDAY, APRIL 22, 2025

TEMPERATURE (DEGREES F)
MAX…….75   NORMAL…..59
MIN…….44   NORMAL…..41
MEAN……60   NORMAL…..50

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+10
TOTAL DEPARTURE FOR THE MONTH………………………+10 [+0.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..5  DEPARTURE…….-10
TOTAL HEATING UNITS FOR THE MONTH……………421  DEPARTURE…….-11
TOTAL HEATING UNITS FOR THE SEASON………….5350  DEPARTURE……-429
TOTAL HEATING UNITS LAST SEASON TO DATE……..5041  DEPARTURE……+309

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH……………..2  DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE SEASON…………….2  DEPARTURE……..+1
TOTAL COOLING UNITS LAST SEASON TO DATE………..0  DEPARTURE……..+2

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)………..30 SSW  @   01:27 A.M.
VECTOR #1 (1-Sec)……….30 SSW  @   01:20 A.M.
VECTOR #2 (1-Sec)……….30 SSW  @   01:23 A.M.
DAVIS #1……………….34 S    @   12:09 A.M.
DAVIS #2 ………………35 S    @   12:28 A.M.
RMY #1 (Instantaneous)…..30 SSW  @   12:32 A.M.
RMY #2 (Instantaneous)…..31 SSW  @   01:23 A.M.
MERLIN…………………28 SSW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 SSW  @   01:28 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22      @   12:34 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21      @   12:34 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 S    @   12:34 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 S    @   12:34 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 SSW  @   12:34 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 S    @   12:37 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.1 SSW [194 total miles] VECTOR #1……………….8.5
VECTOR #2……………….8.5
DAVIS #1………………..8.4 SSW
DAVIS #2………………..8.4 SW
RMY #1………………….8.3 SW
RMY #2………………….8.6 SW
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…………..2.88 DEPARTURE…..-0.73
TOTAL PRECIPITATION FOR THE YEAR (2025)…….13.51 DEPARTURE…..-4.04

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……-1.0
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……35.8 DEPARTURE…..-33.8

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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   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   59/35/47/-1/0.00/0.0/…/..       35 WNW VEC1 34 WNW RMY 34
4/18   66/38/54/+4/0.00/0.0/…/..       41 SSW VEC1 42 SSW RMY 43
4/19   82/52/67/+18/T/0.0/…/..         40 WNW VEC1 40 W   RMY 40
4/20   67/45/56/+7/0.00/0.0/…/..       53 NW  VEC1 54 NW  RMY 56
4/21   63/37/50/0/0.00/0.0/…/..        30 SSW VEC1 28 SSW RMY 31
4/22   75/44/60/+10/0.26/0.0/…/..      30 SSW VEC1 30 SSW RMY 30

4/23 The low since midnight is 43F, the daily normal low is 41F.

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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 23
HIGH 85 IN 1908, 2007
LOW 25 IN 1933,1989
PRECIP 1.99 IN. IN 2012
SNOWFALL 0.5 IN. IN 1911, 1956
PEAK GUST 64 MPH WNW IN 1962

RECORDS FOR APRIL 24
HIGH 82 IN 2001
LOW 22 IN 1930
PRECIP 2.51 INS IN 1898
SNOWFALL 1.2 INS IN 1967
PEAK GUST 59 MPH NW IN 1962

TODAY’S REPORT PREPARED BY: MFD