Monday, March 17, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, MARCH 17, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0552E
SUNSET: 1753E
RAINY AND REMAINING WARM FOR ST. PATRICK’S DAY….
Yesterday was anomalously warm, with the low temperature of 44F breaking
the daily record for the highest minimum temperature. The old record was 43F,
set back in 1921 and 1973. 44F is actually the average high temperature this
time of year!
Moving on to today, downpours overnight and early this morning delivered us
with quite a bit of rainfall. The storm total accumulation so far is 2.08″.
Intensity began to let up late morning, with just occasional light rain by
the final observation.
With continued (but lighter) flow out of the south, temperatures have remained
on the warm side today. The high of 58F took place overnight, with a low in the
low 50s by late morning. Since then, the temperature has risen a touch into the
mid 50s.
Winds were quite active ahead of and with the initial batch of downpours overnight.
The peak gust was at 12:12am, with a speed of 60mph. Speeds have slowed noticeably
since 5am, now out of the west. The average speed so far is 16mph.
Thanks to the precipitation and fog, visibility today has been extremely limited.
This morning, views were only 1/4 mile. With a rising cloud base and lighter
precipitation, views now extend 20 miles.
The maximum temperature for today is 58F degrees, which is 14 degrees
above the normal high of 44F. The minimum temperature since midnight
is 53F degrees, which is 26 degrees above the normal low of 27F.
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Today’s Observations:
7 A.M.
Weather: Sky obscured, vertical visibility 200ft, rain and fog
Temperature: 54F; Dew Point: 54F; Relative Humidity: 100%
Wind: SW @ 8 kts
Sea-level pressure: 1010.2 mb; 29.83 in. Hg: falling, then rising
Visibility: 1/4 mile, fog
6-hr Max temp: 58F
6-hr Min temp: 53F
24-hr Precip: 1.68 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 X W2 1/4RF 102/54/54/2208/983/ 8//// 53005 70168 10058 20053
10 A.M.
Weather: Sky obscured, vertical visibility 200ft, light rain and fog
Temperature: 53F; Dew Point: 53F; Relative Humidity: 100%
Wind: SE @ 9 kts
Sea-level pressure: 1009.0 mb; 29.80 in. Hg: rising, then falling
Visibility: 1/4 mile, fog
3-hr Precip: 0.38 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 X W2 1/4R-F 090/53/53/1309/980/ 8//// 58012 6038/
1 P.M.
Weather: Broken stratus fractus, overcast nimbostratus, very light rain
Temperature: 55F; Dew Point: 55F; Relative Humidity: 100%
Wind: W @ 7 kts
Sea-level pressure: 1008.2 mb; 29.77 in. Hg: falling unsteadily
Visibility: 20 miles, thin fog all quadrants
6-hr Max temp: 56F
6-hr Min temp: 53F
6-hr Precip: 0.40 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E15 BKN 35 OVC 20R- 082/55/55/2707/977/ THN F ALQDS PCPN VRY LGT/
8/72/ 57008 6040/ 10056 20053
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SUMMARY FOR SUNDAY, MARCH 16, 2025
TEMPERATURE (DEGREES F)
MAX…….67 NORMAL…..44
MIN…….44 NORMAL…..27
MEAN……56 NORMAL…..35
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+21
TOTAL DEPARTURE FOR THE MONTH…………………….+99 [+6.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..9 DEPARTURE…….-21
TOTAL HEATING UNITS FOR THE MONTH……………409 DEPARTURE……-100
TOTAL HEATING UNITS FOR THE SEASON………….4590 DEPARTURE……-351
TOTAL HEATING UNITS LAST SEASON TO DATE……..4262 DEPARTURE……+328
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)………..56 SSW @ 11:50 P.M.
VECTOR #1 (1-Sec)……….58 SSW @ 11:50 P.M.
VECTOR #2 (1-Sec)……….57 S @ 11:50 P.M.
DAVIS #1……………….64 S @ 06:14 P.M.
DAVIS #2 ………………71 S @ 11:50 P.M.
RMY #1 (Instantaneous)…..58 SSW @ 11:50 P.M.
RMY #2 (Instantaneous)…..62 S @ 11:50 P.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………42 SSW @ 06:14 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..41 @ 06:14 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..41 @ 06:14 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………43 S @ 10:18 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………46 S @ 11:51 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..40 SSW @ 06:14 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..41 SSW @ 10:18 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..22.8 SSW [548 total miles]
VECTOR #1………………22.4
VECTOR #2………………22.9
DAVIS #1……………….22.5 S
DAVIS #2……………….24.3 SSW
RMY #1…………………21.8 SSW
RMY #2…………………23.1 S
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..1.68 DEPARTURE…..+1.50
TOTAL PRECIPITATION FOR THE MONTH…………..2.86 DEPARTURE…..+0.08
TOTAL PRECIPITATION FOR THE YEAR (2025)……..8.51 DEPARTURE…..-2.77
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……-9.3
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……34.1 DEPARTURE…..-27.1
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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/…/.. 28 S VEC1 28 S RMY 28
3/16 67/44/56/+21/…./0.0/…/.. 56 SSW VEC1 58 SSW RMY 58
3/17 The low since midnight is 53F, the daily normal low is 27F.
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MARCH DAILY RECORDS TO DATE
3/16 RECORD HIGH MINIMUM TEMP OF 44F; OLD RECORD 43F IN 1921, 1973
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR MARCH 17
HIGH 69 IN 2003
LOW 6 IN 1885
PRECIP 1.97 INS. IN 1968
SNOWFALL 6.5 INS. IN 1956
PEAK GUST 70 MPH SSW IN 1973
RECORDS FOR MARCH 18
HIGH 73 IN 2022
LOW 0 IN 1885
PRECIP 5.61 INS. IN 1968 [RECORD FOR MONTH]
SNOWFALL 9.3 INS. IN 1985
PEAK GUST 71e MPH WNW IN 1941
TODAY’S REPORT PREPARED BY: Joshua Polen
