Tuesday, January 23, 2024

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

TUESDAY, JANUARY 23, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0706E
SUNSET:  1646E

INCREASING AND THICKENING CLOUDS THIS MORNING, LIGHT SNOW
DEVELOPING THIS AFTERNOON….

A brief moment of some partial sunshine was observed early
this morning, but clouds were quick to move in thereafter.
The clouds have been thickening and lowering all day with
a bit of light snow developing just after 2pm this afternoon.

Temperatures have risen into the upper 30s late this morning
and early this afternoon, but are now on the decline with
the light precipitation falling. The dew point has been rising
steadily all day, from the mid teens early today to the mid
20s by early this afternoon.

The wind has been generally on the light side, and gradually
veering from the west-southwest early this morning to the
north-northwest by early-mid afternoon. The average speed for
the day so far is around 10mph, but the trend has been
gradually decreasing as the day progresses. The peak gust for
the day to this point has been around 30mph, occurring at
around 12:40am this morning.

Visibility was somewhat limited this morning to around 35 miles
due to haziness, but improved to around 50 miles early this
afternoon before the snow moved in.

The maximum temperature so far today is 38F degrees, this is
4 degrees above the normal high of 34F. The minimum temperature
so far since midnight is 31F degrees, this is 14 degrees above
the normal low of 17F.

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Today’s Observations:

7 A.M.
Weather: Broken cirrocumulus/cirrostratus, thin broken cirrus,
few altocumulus distant W-NW-NE
Temperature: 32F; Dew Point: 15F; Relative Humidity: 49%
Wind: W @ 10 kts
Sea-level pressure: 1028.1 mb; 30.36 in. Hg: rising, then more rapidly
Visibility: 35 miles, hazy
6-hr Max temp: 33F
6-hr Min temp: 31F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 1 inch
BHO SA 1155 E180 BKN 250 -BKN 35 281/32/15/2710/036/ FEW AC DSNT W-NW-NE
HAZY/ 8/059 4/001 53015 10033 20031

10 A.M.
Weather: Broken altocumulus, overcast cirrostratus, few breaks in
overcast distant E-ESE, few stratocumulus distant W-N-NE
Temperature: 36F; Dew Point: 23F; Relative Humidity: 58%
Wind: W @ 9 kts
Sea-level pressure: 1030.3mb; 30.42 in. Hg: rising, then more slowly
Visibility: 35 miles, hazy
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E120 BKN 180 OVC 35 303/36/23/2809/042/ FEW BINOVC DSNT E-ESE
FEW SC DSNT W-N-NE SUN DMLY VSBL HAZY/ 8/557 51022

1 P.M.
Weather: Overcast altostratus, few stratocumulus all quadrants,
virga all quadrants
Temperature: 37F; Dew Point: 26F; Relative Humidity: 65%
Wind: NW @ 7 kts
Sea-level pressure: 1030.7 mb; 30.44 in. Hg: rising, then falling
Visibility: 50 miles
6-hr Max temp: 38F
6-hr Min temp: 32F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 1 inch
BHO SA 1755 E90 OVC 50 307/37/26/3207/044/ FEW SC ALQDS VIRGA ALQDS/
8/52/ 4/001 50004 10038 20032

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SUMMARY FOR MONDAY, JANUARY 22, 2024

TEMPERATURE (DEGREES F)
MAX…….37   NORMAL…..34
MIN…….13   NORMAL…..17
MEAN……25   NORMAL…..26

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………-1
TOTAL DEPARTURE FOR THE MONTH…………………..+49 [+2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………40  DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH…………..790  DEPARTURE…….-50
TOTAL HEATING UNITS FOR THE SEASON…………2685  DEPARTURE……-365
TOTAL HEATING UNITS LAST SEASON TO DATE…….2565  DEPARTURE……+120

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated

F420C (Official)……….E35 SW   @  11:23 P.M.
VECTOR #1 (1-Sec)……….35 SW   @  11:23 P.M.
VECTOR #2 (1-Sec)……….34 WSW  @  11:11 P.M.
DAVIS #1……………….32 SW   @  11:23 P.M.
DAVIS #2 ………………34 WSW  @  11:41 P.M.
RMY #1 (Instantaneous)…..36 SW   @  11:24 P.M.
RMY #2 (Instantaneous)…..35 WSW  @  11:11 P.M.
MERLIN…………………32 WSW
RICHARDS (C5C) (Inst)……36      @  11:41 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………26 SW   @  10:34 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..24      @  11:10 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25      @  11:25 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………24 SW   @  11:10 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 WSW  @  11:10 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..24 SW   @  11:25 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..25 WSW  @  11:25 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………24      @  11:10 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……12.7 WSW [305 total miles] VECTOR #1…………….12.7
VECTOR #2…………….13.5
DAVIS #1……………..12.9 WSW
DAVIS #2……………..13.5 W
RMY #1……………….12.5 W
RMY #2……………….13.4 W
RICHARDS (C5C)………..12.6

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..6.95 DEPARTURE…..+3.70
TOTAL PRECIPITATION FOR THE YEAR (2024)……..6.95 DEPARTURE…..+3.70

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.6
TOTAL SNOWFALL FOR THE MONTH……………….17.5 DEPARTURE……+4.8
TOTAL SNOWFALL FOR THE SEASON (2023-2024)……17.8 DEPARTURE…..-10.0

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PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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

1/1   37/25/31/+2/0.00/0.0/296/54         15 N   VEC1 14 N   RMY 15
1/2   39/19/29/+1/0.00/0.0/550/100        17 WNW VEC1 17 WNW RMY 17
1/3   42/25/34/+6/0.00/0.0/347/63         20 WNW VEC1 21 WNW RMY 21
1/4   42/21/32/+4/T/T/237/43              37 NNW VEC1 36 NNW RMY 39
1/5   32/17/25/-3/0.00/0.0/542/98         40 NW  VEC1 39 NW  RMY 39
1/6   34/24/29/+1/0.11/0.2/022/04         36 E   VEC1 36 E   RMY 36
1/7   33/21/27/0/0.84/13.0/000/00         38 ENE VEC1 37 ENE RMY 42
1/8   32/21/27/0/0.00/0.0/406/73          28 NW  VEC1 28 NW  RMY 31
1/9   40/23/32/+5/0.98/T/000/00           46 SE  VEC1 49 SE  RMY 46
1/10  53/41/47/+20/1.90/0.0/201/36        70 SSE VEC1 69 SSE RMY 75
1/11  43/35/39/+12/0.00/0.0/162/29        45 WNW VEC1 43 WNW RMY 47
1/12  47/33/40/+13/0.00/0.0/533/95        29 SE  VEC1 28 ESE RMY 28
1/13  57/36/47/+21/1.72/0.0/146/26        47 ESE VEC1 51 ESE RMY 49
1/14  39/22/31/+5/0.02/0.4/328/58         53 WNW VEC1 52 WNW RMY 54
1/15  31/17/24/-2/T/T/475/84              30 WNW VEC1 29 WNW RMY 30
1/16  34/19/27/+1/0.61/3.2/000/00         36 NW  VEC1 33 NW* RMY 31*
1/17  25/13/19/-7/0.00/0.0/529/93         29 NW  VEC1 28 W*  RMY 27*
1/18  26/13/20/-6/0.00/0.0/…/..         30 WSW VEC1 30 WSW RMY 29
1/19  27/16/22/-4/T/T/…/..              31 NW  VEC1 30 NW  RMY 34
1/20  20/10/15/-11/0.05/0.7/…/..        30 NW  VEC1 30 NW  RMY 31
1/21  25/10/18/-8/0.00/0.0/…/..         30 NW  VEC1 31 NW  RMY 32
1/22  37/13/25/-1/0.00/0.0/…/..         35 SW  VEC1 35 SW  RMY 36

1/23 The low since midnight is 31F, the daily normal low is 17F

* Reading impacted by icing

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JANUARY DAILY RECORDS TO DATE

1/13: RECORD PRECIPITATION OF 1.72 INS,
BEATS PREVIOUS RECORD OF 1.54 INS SET IN 1979

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

RECORDS FOR JANUARY 23
HIGH 62F IN 1906
LOW -10F IN 1976
PRECIP 1.69 INS. IN 1966
SNOWFALL 14.6 INS. IN 1966
PEAK GUST 85 MPH S IN 1992

RECORDS FOR JANUARY 24
HIGH 60F IN 1967
LOW -12F IN 1907
PRECIP 2.40 INS. IN 1935
SNOWFALL 11.3 INS. IN 1935
PEAK GUST 82 MPH S IN 1996

TODAY’S REPORT PREPARED BY: Matt Douglas