Thursday, March 13, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, MARCH 13, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0559E
SUNSET: 1749E
CLOUDS THINNING TO ALLOW FOR FILTERED SUNSHINE WITH SEASONABLE
TEMPERATURES….
Clouds lingered this morning as a weak weather system moved through
overnight. A band of snow developed with the bulk of the the snow
falling just to the north of the Hill, however we did manage to get
a coating of snow here on the summit.
Clouds have thinned out by the late morning hours with mainly high
thin cirrus clouds covering the sky allowing for filtered sun into
early this afternoon. However, increasing amounts of stratocumulus
are moving in from off the ocean this afternoon.
Temperatures are once again close to seasonal values in the mid
40s today. The dew point, which started the day in the upper 20s,
had decreased to the low to mid 20s for a time before rising
once again toward 30F early this afternoon.
Winds have been steady, but on the lighter side out of the east-
southeast. The average speed for the day so far is around 8mph.
The peak gust for the day occurred just before 9:30am this morning
with a value of 23mph.
Visibility has been decent all day with a view of around 70 miles
most of the day, but slipping to around 60 miles by the 1pm
observation.
The maximum temperature for today is 46F degrees, which is 3 degrees
above the normal high of 43F. The minimum temperature since midnight
is 32F degrees, which is 6 degrees above the normal low of 26F.
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Today’s Observations:
7 A.M.
Weather: Overcast altocumulus/altostratus, few breaks in overcast all
quadrants, thin smoke layer distant W-WNW
Temperature: 35F; Dew Point: 27F; Relative Humidity: 73%
Wind: E @ 9 kts
Sea-level pressure: 1021.9 mb; 30.18 in. Hg: rising, then steady
Visibility: 70 miles
6-hr Max temp: 35F
6-hr Min temp: 32F
24-hr Precip: Trace
24-hr Snowfall: Trace
Snow Depth: 0 inches
BHO SA 1155 E120 OVC 70 219/35/27/1009/018/ FEW BINOVC ALQDS
THN K LYR DSNT W-WNW TOTAL NEW SNW PST 24 HRS TRACE/ 8/07/
51012 70000 10035 20032
10 A.M.
Weather: Thin broken cirrus, few stratocumulus distant all quadrants,
few cirrostratus distant NNW-NE
Temperature: 42F; Dew Point: 23F; Relative Humidity: 46%
Wind: ESE @ 9G18 kts
Sea-level pressure: 1023.0 mb; 30.21 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 60 230/42/23/1209G18/021/ FEW SC DSNT ALQDS
FEW CS DSNT NNW-NE/ 8/508 50011
1 P.M.
Weather: Broken stratocumulus, broken altocumulus, broken cirrus
Temperature: 44F; Dew Point: 31F; Relative Humidity: 58%
Wind: E @ 9 kts
Sea-level pressure: 1022.7 mb; 30.20 in. Hg: steady, then falling
Visibility: 60 miles
6-hr Max temp: 46F
6-hr Min temp: 35F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E30 BKN 80 BKN 250 BKN 60 227/44/31/1009/020/
8/551 58003 10046 20035
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SUMMARY FOR WEDNESDAY, MARCH 12, 2025
TEMPERATURE (DEGREES F)
MAX…….48 NORMAL…..43
MIN…….32 NORMAL…..26
MEAN……40 NORMAL…..34
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+6
TOTAL DEPARTURE FOR THE MONTH…………………….+51 [+4.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….25 DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE MONTH……………336 DEPARTURE…….-52
TOTAL HEATING UNITS FOR THE SEASON………….4517 DEPARTURE……-303
TOTAL HEATING UNITS LAST SEASON TO DATE……..4181 DEPARTURE……+336
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 N @ 07:50 A.M.
VECTOR #1 (1-Sec)……….29 N @ 07:49 A.M.
VECTOR #2 (1-Sec)……….29 NNW @ 07:34 A.M.
DAVIS #1……………….27 N @ 07:29 A.M.
DAVIS #2 ………………26 NNE @ 07:34 A.M.
RMY #1 (Instantaneous)…..29 N @ 07:49 A.M.
RMY #2 (Instantaneous)…..29 NNW @ 07:34 A.M.
MERLIN…………………27 N
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 N @ 07:37 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20 @ 07:50 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19 @ 07:50 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 N @ 07:50 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 N @ 07:50 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 N @ 07:50 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 N @ 07:50 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.3 NNW [224 total miles]
VECTOR #1……………….9.4
VECTOR #2……………….9.9
DAVIS #1………………..9.6 N
DAVIS #2………………..9.7 NNE
RMY #1………………….9.2 NNE
RMY #2………………….9.7 N
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..1.18 DEPARTURE…..-0.91
TOTAL PRECIPITATION FOR THE YEAR (2025)……..6.83 DEPARTURE…..-3.76
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.6
TOTAL SNOWFALL FOR THE MONTH………………TRACE DEPARTURE……-7.2
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……34.1 DEPARTURE…..-25.0
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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/…/.. 69 S VEC1 69 S RMY 68
3/7 41/25/33/0/T/T/…/.. 60 WNW VEC1 61 WNW RMY 64
3/8 40/27/34/+1/0.00/0.0/…/.. 55 W VEC1 55 W RMY 58
3/9 45/25/35/+2/0.00/0.0/…/.. 40 W VEC1 39 W RMY 42
3/10 60/33/47/+13/0.00/0.0/…/.. 38 WNW VEC1 38 WNW RMY 39
3/11 62/37/50/+16/0.00/0.0/…/.. 39 SSW VEC1 40 SSW RMY 40
3/12 48/32/40/+6/T/T/…/.. 29 N VEC1 29 N RMY 29
3/13 The low since midnight is 32F, the daily normal low is 26F.
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MARCH 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 MARCH 13
HIGH 72 IN 1990
LOW -1 IN 1885
PRECIP 2.47 INS. IN 1993
SNOWFALL 23.0 INS. IN 2018 [RECORD FOR MONTH]
PEAK GUST 76 MPH ENE IN 1993 [THE “STORM OF THE CENTURY”]
RECORDS FOR MARCH 14
HIGH 74 IN 1946
LOW 7 IN 1896
PRECIP 4.95 INS. IN 2010
SNOWFALL 7.3 INS. IN 2017
PEAK GUST 67 MPH ENE IN 2010
TODAY’S REPORT PREPARED BY: Matt Douglas
