Tuesday, April 22, 2025

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

TUESDAY, APRIL 22, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0452E
SUNSET:  1834E

RAIN AND FOG EARLY THIS MORNING GIVE WAY TO SUNSHINE AND WARM AIR….

Rain showers began shortly after midnight and continued until
just after 4am this morning. Some of the showers came down
moderately for a time with 0.26″ of rain being recorded by 7am.
Dense fog persisted until the mid morning hours before it began
to lift, shortly there after the stratus layer dissipated
allowing for sunshine to take over. As we move through the early
afternoon hours, diurnal cumulus clouds have developed with the
surface heating taking place.

Temperatures have warmed quite a bit following the warm frontal
passage early this morning. Readings have reached the low to mid
70s this afternoon. The dew point has also been on the rise,
reaching the upper 50s by early this afternoon. There is a bit of
a humid feel to the air out there.

Winds are on the light side, and have become rather variable in
terms of direction early this afternoon. The average speed so far
is around 9mph, owing to some stronger winds during the pre-dawn
hours. The peak gust occurred just before 1:30am with a value of
30mph.

Visibility has gradually improved from around 1/16th of a mile
this morning to around 45 miles on average early this afternoon.
The fog this morning has transitioned to haziness this afternoon.

The maximum temperature for today is 74F degrees, which is 15
degrees above the normal high of 59F. The minimum temperature
since midnight is 44F degrees, which is 3 degrees above the
normal low of 41F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft
Temperature: 49F; Dew Point: 49F; Relative Humidity: 100%
Wind: SSW @ 4 kts, wind light
Sea-level pressure: 1015.7 mb; 29.99 in. Hg: falling, then more slowly
Visibility: 1/16 mile, fog
6-hr Max temp: 49F
6-hr Min temp: 44F
24-hr Precip:  0.26 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 X W2 1/16F 157/49/49/2104/999/ WND LGT/ 8//// 56001 6026/
70026 10049 20044

10 A.M.
Weather: Overcast stratus
Temperature: 56F; Dew Point: 54F; Relative Humidity: 94%
Wind: W @ 5 kts, wind light
Sea-level pressure: 1014.9 mb; 29.97 in. Hg: falling, then more slowly
Visibility: 15 miles, thin fog
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E2 OVC 15 149/56/54/2705/997/ THN F ALQDS WND LGT/ 8/6//
56008

1 P.M.
Weather: Broken cumulus, thin broken cirrus
Temperature: 72F Dew Point: 58F; Relative Humidity: 61%
Wind: SSW @ 5 kts, wind light
Sea-level pressure: 1013.6 mb; 29.93 in. Hg: falling, then more slowly
Visibility: 45 miles, 20 miles N-ENE, hazy
6-hr Max temp: 72F
6-hr Min temp: 49F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E30 BKN 250 -BKN 45 136/72/58/2105/993/ VSBY 20 N-ENE HAZY
WND L/V/ 8/201 56013 10072 20049

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SUMMARY FOR MONDAY, APRIL 21, 2025

TEMPERATURE (DEGREES F)
MAX…….63   NORMAL…..59
MIN…….37   NORMAL…..40
MEAN……50   NORMAL…..50

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….0
TOTAL DEPARTURE FOR THE MONTH……………………….0 [-0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….15  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH……………416  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE SEASON………….5345  DEPARTURE……-418
TOTAL HEATING UNITS LAST SEASON TO DATE……..5022  DEPARTURE……+323

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  @   10:43 P.M.
VECTOR #1 (1-Sec)……….28 SSW  @   10:41 P.M.
VECTOR #2 (1-Sec)……….29 S    @   09:19 P.M.
DAVIS #1……………….34 S    @   04:03 P.M.
DAVIS #2 ………………36 S    @   09:18 P.M.
RMY #1 (Instantaneous)…..31 SSW  @   09:18 P.M.
RMY #2 (Instantaneous)…..30 S    @   04:03 P.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 SSW  @   05:00 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22      @   09:21 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23      @   09:19 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 S    @   09:20 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 S    @   09:19 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 SSW  @   09:19 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 S    @   09:19 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.6 SSW [254 total miles] VECTOR #1………………11.0
VECTOR #2………………11.2
DAVIS #1……………….10.8 SSW
DAVIS #2……………….11.1 SSW
RMY #1…………………10.5 SSW
RMY #2…………………11.2 SSW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.26 DEPARTURE…..+0.12
TOTAL PRECIPITATION FOR THE MONTH…………..2.88 DEPARTURE…..-0.58
TOTAL PRECIPITATION FOR THE YEAR (2025)…….13.51 DEPARTURE…..-3.89

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH………………..1.7 DEPARTURE……-0.9
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……35.8 DEPARTURE…..-33.7

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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 The low since midnight is 44F, 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 22
HIGH 85 IN 1977, 2001
LOW 26 IN 1981
PRECIP 2.60 IN. IN 2019
SNOWFALL 3.0 IN. IN 1940
PEAK GUST 68e MPH NW IN 1945

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

TODAY’S REPORT PREPARED BY: MFD