Wednesday, January 24, 2024

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

WEDNESDAY, JANUARY 24, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0705E
SUNSET:  1647E

LIGHT SNOW OVERNIGHT, TURNS TO LIGHT RAIN AND DRIZZLE THIS
MORNING….

Periods of light snow overnight deposited 1.2″ of snow on
the summit by early this morning. This melted down to 0.14″
of liquid, indicating a very wet snow despite temperatures
generally below freezing during the time of snowfall.

It warmed enough aloft however for the snow to change to
light rain and drizzle early this morning, but not before
a very brief period of light freezing drizzle. Most of the
precipitation that has fallen since around 4am has been very
light, with only an additional 0.01″ of precipitation
measured between 4am-1pm.

Temperatures have been very slowly rising, from a low of 29F
at around 4am to the mid 30s by early this afternoon.

The wind has been quite light today, veering from the north
in the wee hours of the morning to the south by mid morning
and into early this afternoon. The average speed for the day
so far is only around 6mph. The peak gust been a meager 16mph
occurring just after 1pm.

Visibility has been quite limited as we’ve been in the clouds
all day. The view has only ranged between 1/16 to 1/8 of a
mile.

The maximum temperature so far today is 34F degrees, this is
equal to the normal high of 34F. The minimum temperature so
far since midnight is 29F degrees, this is 12 degrees above
the normal low of 17F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft
Temperature: 31F; Dew Point: 31F; Relative Humidity: 100%
Wind: SE @ 6 kts, wind light
Sea-level pressure: 1035.8 mb; 30.59 in. Hg: falling, then rising
Visibility: 1/8 mile, fog
6-hr Max temp: 31F
6-hr Min temp: 29F
24-hr Precip: 0.14 inches
24-hr Snowfall: 1.2 inches
Snow Depth: 2 inches
BHO SA 1155 X W2 1/8F 358/31/31/1306/059/ S-B12E44 WND LGT TOTAL NEW
SNW PST 24HRS 1.2 INS/ 8//// 4/002 55000 6004/ 70014 10031 20029

10 A.M.
Weather: Sky obscured, vertical visibility 200ft, light drizzle
Temperature: 32F; Dew Point: 32F; Relative Humidity: 100%
Wind: S @ 6 kts, wind light
Sea-level pressure: 1035.7mb; 30.58 in. Hg: falling, then rising
Visibility: 1/8 mile, fog
3-hr Precip: Trace
3-hr Snowfall: 0.0 inches
BHO SA 1455 X W2 1/8L-F 357/32/32/1906/058/ R-E40 L-B40 WND LGT/ 8////
55001 6000/

1 P.M.
Weather: Sky obscured, vertical visibility 100ft
Temperature: 34F; Dew Point: 34F; Relative Humidity: 100%
Wind: SSE @ 8 kts
Sea-level pressure: 1032.9 mb; 30.50 in. Hg: falling, then more slowly
Visibility: 1/16 mile, fog
6-hr Max temp: 34F
6-hr Min temp: 31F
6-hr Precip: 0.01 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 1 inch
BHO SA 1755 X W1 1/16F 329/34/34/1608/050/ R-E08/ 8//// 4/001 56028
6001/ 10034 20031

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SUMMARY FOR TUESDAY, JANUARY 23, 2024

TEMPERATURE (DEGREES F)
MAX…….38   NORMAL…..34
MIN…….30   NORMAL…..17
MEAN……34   NORMAL…..26

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………+8
TOTAL DEPARTURE FOR THE MONTH…………………..+57 [+2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………31  DEPARTURE……..-8
TOTAL HEATING UNITS FOR THE MONTH…………..821  DEPARTURE…….-59
TOTAL HEATING UNITS FOR THE SEASON…………2716  DEPARTURE……-374
TOTAL HEATING UNITS LAST SEASON TO DATE…….2599  DEPARTURE……+117

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)……….E30 WSW  @  12:41 A.M.
VECTOR #1 (1-Sec)……….30 WSW  @  12:32 A.M.
VECTOR #2 (1-Sec)……….31 WSW  @  01:06 A.M.
DAVIS #1……………….28 WSW  @  12:14 A.M.
DAVIS #2 ………………31 WSW  @  12:19 A.M.
RMY #1 (Instantaneous)…..31 WSW  @  12:49 A.M.
RMY #2 (Instantaneous)…..32 WSW  @  12:31 A.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……31      @  12:17 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………23 WSW  @  01:14 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21      @  12:21 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23      @  12:33 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 SW   @  12:21 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 WSW  @  12:02 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 WSW  @  12:21 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 WSW  @  12:33 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………21      @  12:21 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….8.5 W [203 total miles] VECTOR #1……………..8.6
VECTOR #2……………..9.0
DAVIS #1………………8.6 W
DAVIS #2………………8.7 WNW
RMY #1………………..8.4 WNW
RMY #2………………..9.0 WNW
RICHARDS (C5C)…………9.0

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.14 DEPARTURE……0.00
TOTAL PRECIPITATION FOR THE MONTH…………..7.09 DEPARTURE…..+3.70
TOTAL PRECIPITATION FOR THE YEAR (2024)……..7.09 DEPARTURE…..+3.70

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..1.2 DEPARTURE……+0.6
TOTAL SNOWFALL FOR THE MONTH……………….18.7 DEPARTURE……+5.4
TOTAL SNOWFALL FOR THE SEASON (2023-2024)……19.0 DEPARTURE……-9.4

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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  38/30/34/+8/0.07/0.5/…/..         30 WSW VEC1 30 WSW RMY 31

1/24 The low since midnight is 29F, 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 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

RECORDS FOR JANUARY 25
HIGH 56F IN 2010
LOW -9F IN 1935
PRECIP 2.24 INS. IN 1979
SNOWFALL 12.5 INS. IN 1941
PEAK GUST 81 MPH WNW IN 1972

TODAY’S REPORT PREPARED BY: Matt Douglas