Sunday, March 23, 2025

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

SUNDAY, MARCH 23, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0542E
SUNSET:  1800E

CALENDAR SAYS SPRING, MOTHER NATURE SAYS NOT SO FAST….

What a change in the weather from yesterday. After a nice spring
feel with readings into the lower 60s, a cold front pushed through
the area last evening bringing a sharp change to the air mass with
strong cold air advection, which is continuing today. While we are
enjoying plenty of bright sunshine today, the temperature and dew
point is more akin to late February with even colder wind chill
values!

Temperatures this morning started in the mid 20s, which is actually
below normal for this late in the month. Readings have been slowly
rising through the 30s only reaching the low 40s by the time of the
1pm observation. Dew point values are indicative of an arctic air mass
with readings in the upper single digits to 10F degrees all day. It
is also adding a decided chill to the air as well, especially with
the gusty winds.

Winds are busy today averaging out of the northwest at around 18mph.
The peak gust so far today is 39mph, which occurred right at 7am.

Thanks to the very dry air, visibility is excellent, extending up
to 70 miles all day.

The maximum temperature for today is 41F degrees, which is 5 degrees
below the normal high of 46F. The minimum temperature since midnight
is 25F degrees, which is 4 degrees below the normal low of 29F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant all quadrants, few cirrus
distant W-N-ENE
Temperature: 27F; Dew Point: 8F; Relative Humidity: 45%
Wind: NW @ 16G28 kts, peak wind NW 32mph at 6:52 A.M.
Sea-level pressure: 1015.3 mb; 29.98 in. Hg: rising unsteadily
Visibility: 70 miles
6-hr Max temp: 31F
6-hr Min temp: 25F
24-hr Precip:  Trace
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 70 153/27/8/3216G28/998/ FEW SC DSNT ALQDS FEW CI DSNT
W-N-ENE PK WND 3228/52/ 8/501 52038 70000 10031 20025

10 A.M.
Weather: Clear, few cirrus distant NW-NE-ESE
Temperature: 34F; Dew Point: 9F; Relative Humidity: 34%
Wind: NW @ 17G26 kts, peak wind WNW 33mph at 9:41 A.M.
Sea-level pressure: 1077.7 mb; 30.05 in. Hg: rising, then more slowly
Visibility: 70 miles
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 70 177/34/9/3117G26/005/ FEW CI DSNT NW-NE-ESE
PK WND 3029/41/ 8/001 51024

1 P.M.
Weather: Clear, few cirrus distant NNE-NE
Temperature: 41F; Dew Point: 10F; Relative Humidity: 27%
Wind: NW @ 13G26 kts, peak wind NW 30mph at 12:53 P.M.
Sea-level pressure: 1018.2 mb; 30.07 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 41F
6-hr Min temp: 27F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 CLR 70 182/41/10/3113G26/007/ FEW CI DSNT NNE-NE
PK WND 3126/53/ 8/001 51005 10041 20027

————————————————————–

SUMMARY FOR SATURDAY, MARCH 22, 2025

TEMPERATURE (DEGREES F)
MAX…….62   NORMAL…..46
MIN…….33   NORMAL…..29
MEAN……48   NORMAL…..37

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+11
TOTAL DEPARTURE FOR THE MONTH……………………+147 [+6.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….17  DEPARTURE…….-11
TOTAL HEATING UNITS FOR THE MONTH……………532  DEPARTURE……-148
TOTAL HEATING UNITS FOR THE SEASON………….4713  DEPARTURE……-399
TOTAL HEATING UNITS LAST SEASON TO DATE……..4421  DEPARTURE……+292

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)………..53 WNW  @   08:22 P.M.
VECTOR #1 (1-Sec)……….52 WNW  @   08:22 P.M.
VECTOR #2 (1-Sec)……….55 WNW  @   08:20 P.M.
DAVIS #1……………….53 WNW  @   08:15 P.M.
DAVIS #2 ………………50 NW   @   08:21 P.M.
RMY #1 (Instantaneous)…..58 WNW  @   08:22 P.M.
RMY #2 (Instantaneous)…..57 WNW  @   08:22 P.M.
MERLIN…………………51 NW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………40 NW   @   08:23 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..35      @   08:22 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..39      @   08:22 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………37 WNW  @   08:22 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………38 NW   @   08:22 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..34 WNW  @   08:22 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..37 WNW  @   08:22 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..16.3 WSW [392 total miles] VECTOR #1………………15.9
VECTOR #2………………16.8
DAVIS #1……………….16.3 WSW
DAVIS #2……………….16.8 W
RMY #1…………………15.3 WSW
RMY #2…………………16.6 WSW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.19
TOTAL PRECIPITATION FOR THE MONTH…………..3.74 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE YEAR (2025)……..9.39 DEPARTURE…..-3.03

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…..-12.2
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……34.1 DEPARTURE…..-30.0

————————————————————–

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/+5/0.00/0.0/362/50       31 NNW VEC1 31 NNW RMY 32
3/19   52/34/43/+7/0.00/0.0/662/91       18 NE  VEC1 18 NE  RMY 17
3/20   55/36/46/+9/0.03/0.0/…/..       30 S   VEC1 30 S   RMY 30
3/21   46/36/41/+4/0.36/0.0/…/..       48 NW  VEC1 49 NW  RMY 54
3/22   62/33/48/+11/T/0.0/…/..         53 WNW VEC1 52 WNW RMY 58

3/23 The low since midnight is 25F, the daily normal low is 29F.

————————————————————–

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

————————————————————–

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

RECORDS FOR MARCH 23
HIGH 78 IN 1938
LOW 3 IN 1934
PRE 2.52 INS. IN 2010
SNOW 3.0 INS. IN 1977
WIND 78e MPH W IN 1940

RECORDS FOR MARCH 24
HIGH 70 IN 1920
LOW 6 IN 1906
PRECIP 1.51 INS. IN 1956
SNOWFALL 12.3 INS. IN 1956
PEAK GUST 71 MPH W IN 1968

TODAY’S REPORT PREPARED BY: Matt Douglas