Wednesday, March 19, 2025

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

WEDNESDAY, MARCH 19, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0549E
SUNSET:  1756E

A WONDERFUL WEDNESDAY WITH PLENTY OF SUNSHINE AND MILD TEMPERATURES….

Today is featuring mainly clear skies with plenty of bright sunshine,
mild temperatures, and a light onshore wind. High thin cirrus clouds
can be seen encroaching in the distance from the south through
west and northwest. Also a fog bank is lurking right along the
coast early this afternoon with parts of it even getting into the
easternmost portions of Boston for at times.

Temperatures bottomed out in the mid 30s once again this morning,
recovering to the low 50s early this afternoon. These values are a
bit above normal for the date, so all in all it’s quite a nice day
out there. The dew point is a bit higher today thanks to the ocean
flow with readings rising through the 30s to 40F as the day has
progressed.

The wind is generally on the light side with an average speed for
the day so far around 9mph. It’s been mainly out of the northeast,
but became a bit more variable as we moved into the late morning
hours. The peak gust for the day is 18mph, which occurred around
3:15am this morning.

Visibility has been excellent again today, starting at around 70
miles, then dipping to around 60 mile by mid to late morning.
However a fog bank lurking offshore had reduced visibility to
around 12-20 miles from the NNE to ESE sectors.

The maximum temperature for today is 52F degrees, which is 7 degrees
above the normal high of 45F. The minimum temperature since midnight
is 34F degrees, which is 6 degrees above the normal low of 28F.

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Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant E-ESE, few cirrus distant E-S
Temperature: 38F; Dew Point: 31F; Relative Humidity: 75%
Wind: NE @ 8 kts
Sea-level pressure: 1020.9 mb; 30.15 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 38F
6-hr Min temp: 34F
24-hr Precip:  0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 70 209/38/31/0408/015/ FEW SC DSNT E-ESE FEW CI DSNT E-S/
8/501 51020 10038 20034

10 A.M.
Weather: Clear. few stratocumulus distant NNE-SE, few cirrus distant ESE-SSE
Temperature: 46F; Dew Point: 38F; Relative Humidity: 72%
Wind: NE @ 7 kts
Sea-level pressure: 1021.5 mb; 30.16 in. Hg: rising, then falling
Visibility: 60 miles
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 60 215/46/38/0507/016/ FEW SC DSNT NNE-SE
FEW CI DSNT ESE-SSE/ 8/501 50006

1 P.M.
Weather: Clear, stratus layer distant NNE-SE, few cirrus distant SE-SW-NNW,
fog bank distant NNE-SE
Temperature: 49F; Dew Point: 40F; Relative Humidity: 69%
Wind: ENE @ 6 kts, wind light
Sea-level pressure: 1019.8 mb; 30.11 in. Hg: falling unsteadily
Visibility: 60 miles, 12 miles NNE-ENE, 20 miles E-ESE
6-hr Max temp: 52F
6-hr Min temp: 38F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 CLR 60 198/49/40/0606/011/ ST LYR DSNT NNE-SE
FEW CI DSNT SE-SW-NNW F BNK DSNT NNE-SE VSBY 12 NNE-ENE 20 E-ESE
WND LGT/ 8/601 57017 10052 20038

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SUMMARY FOR TUESDAY, MARCH 18, 2025

TEMPERATURE (DEGREES F)
MAX…….48   NORMAL…..44
MIN…….34   NORMAL…..27
MEAN……41   NORMAL…..36

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+5
TOTAL DEPARTURE FOR THE MONTH……………………+116 [+6.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….24  DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH……………450  DEPARTURE……-117
TOTAL HEATING UNITS FOR THE SEASON………….4631  DEPARTURE……-368
TOTAL HEATING UNITS LAST SEASON TO DATE……..4301  DEPARTURE……+330

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)………..31 NNW  @   03:06 A.M.
VECTOR #1 (1-Sec)……….31 NNW  @   02:56 A.M.
VECTOR #2 (1-Sec)……….33 NNW  @   02:56 A.M.
DAVIS #1……………….31 NNW  @   02:57 A.M.
DAVIS #2 ………………29 N    @   02:52 A.M.
RMY #1 (Instantaneous)…..32 NNW  @   02:52 A.M.
RMY #2 (Instantaneous)…..34 NNW  @   02:58 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………24 NNW  @   02:59 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21      @   02:53 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22      @   02:56 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 NNW  @   02:53 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 N    @   02:58 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 NW   @   02:57 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 NNW  @   02:58 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.7 ENE [257 total miles] VECTOR #1………………10.6
VECTOR #2………………11.2
DAVIS #1……………….11.2 NNE
DAVIS #2……………….11.1 NE
RMY #1…………………10.6 NNE
RMY #2…………………11.0 NNE
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.19
TOTAL PRECIPITATION FOR THE MONTH…………..3.35 DEPARTURE…..+0.19
TOTAL PRECIPITATION FOR THE YEAR (2025)……..9.00 DEPARTURE…..-2.66

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.5
TOTAL SNOWFALL FOR THE MONTH………………TRACE DEPARTURE…..-10.3
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……34.1 DEPARTURE…..-28.1

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PRELIMINARY CLIMATE SUMMARY FOR MARCH 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

3/1    50/21/36/+5/T/T/081/12            46 NW  VEC1 46 NW  RMY 49
3/2    28/14/21/-11/0.00/0.0/672/99      41 NW  VEC1 42 NW  RMY 43
3/3    31/8/20/-12/0.00/0.0/667/98       28 NW  VEC1 28 NW  RMY 31
3/4    48/23/36/+4/0.00/0.0/390/57       41 SW  VEC1 42 SW  RMY 43
3/5    54/41/48/+16/0.52/0.0/021/03      50 SSW VEC1 50 SSW RMY 55
3/6    55/32/44/+11/0.66/T/014/02        69 S   VEC1 69 S   RMY 68
3/7    41/25/33/0/T/T/638/92             60 WNW VEC1 61 WNW RMY 64
3/8    40/27/34/+1/0.00/0.0/619/89       55 W   VEC1 55 W   RMY 58
3/9    45/25/35/+2/0.00/0.0/544/78       40 W   VEC1 39 W   RMY 42
3/10   60/33/47/+13/0.00/0.0/680/97      38 WNW VEC1 38 WNW RMY 39
3/11   62/37/50/+16/0.00/0.0/676/96      39 SSW VEC1 40 SSW RMY 40
3/12   48/32/40/+6/T/T/544/77            29 N   VEC1 29 N   RMY 29
3/13   46/32/39/+5/0.00/0.0/483/68       25 ESE VEC1 26 ESE RMY 25
3/14   54/33/44/+9/0.00/0.0/570/80       22 SSW VEC1 22 SSW RMY 22
3/15   59/37/48/+13/0.00/0.0/358/50      28 S   VEC1 28 S   RMY 28
3/16   67/44/56/+21/0.05/0.0/136/19      56 SSW VEC1 58 SSW RMY 58
3/17   58/38/48/+12/2.12/0.0/000/00      60 SSW VEC1 60 SSW RMY 60
3/18   48/34/41/+5/0.00/0.0/…/..       31 NNW VEC1 31 NNW RMY 32

3/19 The low since midnight is 34F, the daily normal low is 28F.

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MARCH DAILY RECORDS TO DATE

3/16 RECORD HIGH MINIMUM TEMP OF 44F;
OLD RECORD WAS 43F IN 1921, 1973

3/17 RECORD PRECIPITATION AMOUNT OF 2.12 INS;
OLD RECORD WAS 1.97 INS IN 1968

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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR MARCH 19
HIGH 77 IN 2012
LOW -2 IN 1967
PRECIP 1.69 INS. IN 1956
SNOWFALL 17.6 INS. IN 1956
PEAK GUST 75e MPH WNW IN 1941

RECORDS FOR MARCH 20
HIGH 79 IN 1945
LOW 4 IN 1885
PRECIP 1.39 INS. IN 1957
SNOWFALL 11.4 INS. IN 1957
PEAK GUST 63 MPH SE IN 1975

TODAY’S REPORT PREPARED BY: Matt Douglas