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Tuesday, April 15, 2025

April 15, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, APRIL 15, 2025 ALL TIMES ARE…

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

TUESDAY, APRIL 15, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0503E
SUNSET:  1826E

OVERCAST WITH SCATTERED SHOWERS AROUND, STILL ON THE MILDER SIDE….

Skies have been dominated by cloud cover today, but at least it’s
been mainly dry to this point. Only a few light rain showers have
occurred sporadically since the pre-dawn hours. We even had a
thunderstorm roll by between 3-4am this morning, but the rainfall
associated with it missed Blue Hill. So far, only a trace of rain
has occurred for the day.

Temperatures are again above average for today with readings
starting the day in the mid 40s. We did briefly reach the 60F
degree mark earlier, but dropped back into the upper 50s as a rain
shower moved through. Dew point values are on the rise as well,
going from the mid 40s to the low 50s through the day.

Winds have been fairly steady out of mainly a south-southwesterly
direction. The average speed for the day so far is around 11mph.
The peak gust for the day so far is 23mph, which occurred before
3am this morning.

Visibility has been limited today by thin fog and haziness. The
view has generally been under 40 miles all day.

The maximum temperature for today is 60F degrees, which is 4
degrees above the normal high of 56F. The minimum temperature
since midnight is 47F degrees, which is 9 degrees above the
normal low of 38F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus, broken altocumulus/castellanus,
overcast altostratus, few lower stratus fractus all quadrants
Temperature: 48F; Dew Point: 46F; Relative Humidity: 93%
Wind: S @ 9 kts
Sea-level pressure: 1000.2 mb; 29.54 in. Hg: falling, then more slowly
Visibility: 20 miles, 40 miles WNW-NW, 15 miles N-NE, thin fog
6-hr Max temp: 52F
6-hr Min temp: 47F
24-hr Precip:  Trace
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 33 SCT E55 BKN 90 OVC 20 002/48/46/1709/954/
FEW LWR STFRA ALQDS THN F ALQDS SUN DMLY VSBL VSBY 40 WNW-NW
15 N-NE/ 8/57/ 56020 6000/ 70000 10052 20047

10 A.M.
Weather: Scattered stratocumulus, broken altostratus, overcast
cirrostratus, few breaks in overcast distant NW-NE
Temperature: 54F; Dew Point: 48F; Relative Humidity: 81%
Wind: SSW @ 8 kts
Sea-level pressure: 998.2 mb; 29.48 in. Hg: falling, then more rapidly
Visibility: 30 miles, hazy
3-hr Precip:  Trace
3-hr Snowfall: 0.0 inches
BHO SA 1455 45 SCT E120 BKN 200 OVC 30 982/54/48/2008/948/
FEW BINOVC DSNT NW-NE HAZY/ 8/528 58020 6000/

1 P.M.
Weather: Broken altocumulus, overcast altostratus, few cumulus
distant W-N
Temperature: 58F Dew Point: 51F; Relative Humidity: 77%
Wind: SSW @ 7 kts
Sea-level pressure: 995.1 mb; 29.39 in. Hg: falling, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 60F
6-hr Min temp: 48F
6-hr Precip:  Trace
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E85 BKN 120 OVC 30 951/58/51/1907/939/ FEW CU DSNT W-N
RW-E43 HAZY/ 8/27/ 56031 6000/ 10060 20048

————————————————————–

SUMMARY FOR MONDAY, APRIL 14, 2025

TEMPERATURE (DEGREES F)
MAX…….67   NORMAL…..56
MIN…….35   NORMAL…..37
MEAN……51   NORMAL…..47

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+4
TOTAL DEPARTURE FOR THE MONTH……………………..-33 [-2.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….14  DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH……………330  DEPARTURE…….+31
TOTAL HEATING UNITS FOR THE SEASON………….5259  DEPARTURE……-387
TOTAL HEATING UNITS LAST SEASON TO DATE……..4917  DEPARTURE……+342

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)………..29 WNW  @   12:23 P.M.
VECTOR #1 (1-Sec)……….29 NNW  @   09:53 A.M.
VECTOR #2 (1-Sec)……….33 NW   @   09:27 A.M.
DAVIS #1……………….27 NW   @   09:53 A.M.
DAVIS #2 ………………28 NNW  @   09:53 A.M.
RMY #1 (Instantaneous)…..28 NNW  @   09:52 A.M.
RMY #2 (Instantaneous)…..33 NW   @   09:27 A.M.
MERLIN…………………25 NW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 NNW  @   09:28 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19      @   09:29 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20      @   09:28 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 NNW  @   09:29 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 NNW  @   09:28 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 NNW  @   09:29 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 NNW  @   09:52 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.9 NW [262 total miles] VECTOR #1………………11.0
VECTOR #2………………11.4
DAVIS #1……………….11.1 WNW
DAVIS #2……………….11.2 NW
RMY #1…………………10.7 WNW
RMY #2…………………11.3 WNW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..2.58 DEPARTURE…..+0.16
TOTAL PRECIPITATION FOR THE YEAR (2025)…….13.29 DEPARTURE…..-3.15

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……-0.4
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……35.8 DEPARTURE…..-33.2

————————————————————–

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/…/..       29 WNW VEC1 29 NNW RMY 28

4/15 The low since midnight is 47F, the daily normal low is 38F.

————————————————————–

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 15
HIGH 81 IN 1896
LOW 23 IN 1943
PRECIP 1.75 IN. IN 2007
SNOWFALL 1.0 IN. IN 1916, 1962
PEAK GUST 66 MPH E IN 2007

RECORDS FOR APRIL 16
HIGH 89 IN 2012
LOW 23 IN 1943
PRECIP 2.63 IN. IN 2018
SNOWFALL 3.6 IN. IN 2021
PEAK GUST 73 MPH E IN 2007

TODAY’S REPORT PREPARED BY: MFD

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Blue Hill Observatory & Science Center · Legal

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Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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