Monday, April 28, 2025

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

MONDAY, APRIL 28, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0443E
SUNSET:  1841E

A PERFECTLY CLEAR SKY ON THIS ARGUABLY TOP 10 WEATHER DAY….

Not a cloud is visible save for a few cirrus early this afternoon
well off in the distance. With temperatures in the 70s, and a
refreshing northerly breeze, it is at least a near top 10 weather
day!

As mentioned, the temperature has reached the low to mid 70s early
this afternoon. With dew point values in the 30s, the air is quite
dry as relative humidity values have dropped below 30%.

Winds have been steady today, but not nearly as intense as yesterday.
A mainly north-northwest wind has been averaging at around 12mph for
the day so far. The peak gust for the day so far is 28mph, which
occurred just after 7am this morning.

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

The maximum temperature for today is 74F degrees, which is 12 degrees
above the normal high of 62F. The minimum temperature since midnight
is 43F degrees, which is equal to the normal low of 43F.

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Today’s Observations:

7 A.M.
Weather: Clear
Temperature: 55F; Dew Point: 36F; Relative Humidity: 49%
Wind: NNW @ 11G20 kts
Sea-level pressure: 1022.8 mb; 30.20 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 55F
6-hr Min temp: 43F
24-hr Precip:  0.01 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 70 228/55/36/3311G20/020/ 8/000 51031 70001 10055 20043

10 A.M.
Weather: Clear
Temperature: 67F; Dew Point: 37F; Relative Humidity: 33%
Wind: NNW @ 8G17 kts
Sea-level pressure: 1024.7 mb; 30.26 in. Hg: rising, then more slowly
Visibility: 70 miles
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 70 247/67/37/3408G17/026/ 8/000 51019

1 P.M.
Weather: Clear, few cirrus distant WSW-WNW
Temperature: 72F Dew Point: 37F; Relative Humidity: 28%
Wind: N @ 8G20 kts, wind NW variable NE
Sea-level pressure: 1024.4 mb; 30.25 in. Hg: falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 73F
6-hr Min temp: 55F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 CLR 70 244/72/37/3508G20/025/ FEW CI DSNT WSW-WNW
WND 31V04/ 8/001 56003 10073 20055

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SUMMARY FOR SUNDAY, APRIL 27, 2025

TEMPERATURE (DEGREES F)
MAX…….56   NORMAL…..61
MIN…….41   NORMAL…..42
MEAN……49   NORMAL…..52

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-3
TOTAL DEPARTURE FOR THE MONTH………………………+40 [+1.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….16  DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE MONTH……………460  DEPARTURE…….-42
TOTAL HEATING UNITS FOR THE SEASON………….5389  DEPARTURE……-460
TOTAL HEATING UNITS LAST SEASON TO DATE……..5130  DEPARTURE……+259

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………0
TOTAL COOLING UNITS FOR THE SEASON…………….2  DEPARTURE………0
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)………..48 NW   @   05:36 P.M.
VECTOR #1 (1-Sec)……….48 NW   @   05:36 P.M.
VECTOR #2 (1-Sec)……….48 WNW  @   04:10 P.M.
DAVIS #1……………….47 W    @   05:36 P.M.
DAVIS #2 ………………44 WNW  @   04:10 P.M.
RMY #1 (Instantaneous)…..56 NW   @   05:36 P.M.
RMY #2 (Instantaneous)…..53 NW   @   02:51 P.M.
MERLIN…………………47 NW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………33 NW   @   05:11 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..30      @   01:16 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..34      @   01:16 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………32 WNW  @   01:16 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………34 WNW  @   01:16 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..30 NW   @   02:52 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..33 WNW  @   01:16 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..19.4 WNW [465 total miles] VECTOR #1………………18.3
VECTOR #2………………19.5
DAVIS #1……………….19.2 WNW
DAVIS #2……………….19.3 NW
RMY #1…………………17.6 WNW
RMY #2…………………18.9 WNW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.01 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..3.41 DEPARTURE…..-0.93
TOTAL PRECIPITATION FOR THE YEAR (2025)…….14.12 DEPARTURE…..-4.24

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……-1.1
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……35.8 DEPARTURE…..-33.9

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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/-1/0.00/0.0/800/99       35 WNW VEC1 34 WNW RMY 34
4/18   66/38/54/+4/0.00/0.0/617/76       41 SSW VEC1 42 SSW RMY 43
4/19   82/52/67/+18/T/0.0/383/47         40 WNW VEC1 40 W   RMY 40
4/20   67/45/56/+7/0.00/0.0/768/94       53 NW  VEC1 54 NW  RMY 56
4/21   63/37/50/0/0.00/0.0/566/69        30 SSW VEC1 28 SSW RMY 31
4/22   75/44/60/+10/0.26/0.0/452/55      30 SSW VEC1 30 SSW RMY 30
4/23   72/43/58/+8/0.00/0.0/792/96       24 NW  VEC1 23 NW  RMY 26
4/24   74/45/60/+9/0.00/0.0/…/..       31 S   VEC1 31 S   RMY 30
4/25   78/52/65/+14/T/0.0/…/..         30 SSW VEC1 30 SSW RMY 30
4/26   59/49/54/+2/0.52/0.0/…/..       42 SSW VEC1 42 SSW RMY 43
4/27   56/41/49/-3/0.01/0.0/…/..       48 NW  VEC1 48 NW  RMY 56

4/28 The low since midnight is 43F, the daily normal low is 43F.

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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 28
HIGH 92 IN 1990, 2009
LOW 26 IN 1947
PRECIP 2.41 IN 1904
SNOWFALL 10.0 IN. IN 1987
PEAK GUST 69 MPH NE 1967

RECORDS FOR APRIL 29
HIGH 85 IN 1974
LOW 26 IN 1909
PRECIP 1.65 IN 1923
SNOWFALL 1.0 IN. IN 1987
PEAK GUST 55 MPH WNW IN 2010

TODAY’S REPORT PREPARED BY: MFD