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Wednesday, October 18, 2023

October 18, 2023

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA WEDNESDAY, OCTOBER 18, 2023 ALL TIMES ARE…

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

WEDNESDAY, OCTOBER 18, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0600E
SUNSET:  1658E

CLOUDY AND SEASONABLE FALL DAY WITH NOTICEABLE LACK OF WIND…

Clouds have dominated the skies today, with a stratocumulus
overcast this morning giving way to an altocumulus overcast
by the afternoon, with some breaks. Some towering cumulus
clouds have been visible in the distance all day, most
noticeably to our east.

Temperatures have increased slowly throughout the day, starting
the morning around 50F and climbing to the low 60s by the
afternoon. The dew point has remained nearly steady in the
upper 40s.

Perhaps most notable today has been the lack of wind, with
more than one hour already coming in as calm. The average
speed so far is only 5mph. The peak gust thus far was 13mph,
occurring just after 1am.

Visibility has been slightly reduced compared to yesterday,
beginning the morning at 70 miles and falling to 60 miles.

The maximum temperature so far today has been 61F, which is 1
degree above the normal high of 60F. The minimum temperature
since midnight is 49F, which is 6 degrees above the normal low
of 43F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Overcast stratocumulus, few lower stratocumulus ENE-SE,
few cumulus/towering cumulus distant NE-S, virga NW-ENE
Temperature: 50F; Dew Point: 47F; Relative Humidity: 87%
Wind: NNW @ 4 kts, wind light
Sea-level pressure: 1021.3 mb; 30.16 in. Hg: rising, then more rapidly
Visibility: 70 miles
6-hr Max temp: 50F
6-hr Min temp: 49F
24-hr Precip: Trace
BHO SA 1155 E65 OVC 70 213/50/47/3304/016/ FEW BINOVC ALQDS FEW LWR SC ENE-SE
FEW CU/TCU DSNT NE-S VIRGA NW-ENE WND LGT/ 8/8// 53014 70000 10050 20049

10 A.M.
Weather: Overcast stratocumulus, few cumulus/towering cumulus distant E-S-W,
virga E
Temperature: 55F; Dew Point: 49F; Relative Humidity: 80%
Wind: calm
Sea-level pressure: 1022.3 mb; 30.19 in. Hg: rising unsteadily
Visibility: 60 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E70 OVC 60 223/55/49/0000/019/ FEW BINOVC DSNT E-S
FEW CU/TCU DSNT E-S-W VIRGA E WND CALM/ 8/8// 52010

1 P.M.
Weather: Overcast altocumulus, few cumulus/towering cumulus
Temperature:60F; Dew Point: 47F; Relative Humidity: 62%
Wind: SSW @ 2 kts, wind light and variable
Sea-level pressure: 1021.3 mb; 30.16 in. Hg: falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 61F
6-hr Min temp: 50F
6-hr Precip: 0.00 inches
BHO SA 1755 E75 OVC 60 213/60/47/2102/016/ FEW BINOVC ALQDS FEW CU/TCU ALQDS
WND L/V/ 8/26/ 58010 10061 20050

————————————————————–

SUMMARY FOR TUESDAY, OCTOBER 17, 2023

TEMPERATURE (DEGREES F)
MAX…….60   NORMAL…..61
MIN…….45   NORMAL…..44
MEAN……53   NORMAL…..52

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+1
TOTAL DEPARTURE FOR THE MONTH…………………+65 [+3.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………12  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………..119  DEPARTURE…….-56
TOTAL HEATING UNITS FOR THE SEASON………….218  DEPARTURE…….-75
TOTAL HEATING UNITS LAST SEASON TO DATE……..248  DEPARTURE…….-30

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH……………15  DEPARTURE……..+9
TOTAL COOLING UNITS FOR THE SEASON………….704  DEPARTURE…….+28
TOTAL COOLING UNITS LAST SEASON TO DATE……..884  DEPARTURE……-180

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)……….E15 N    @  06:36 A.M.
VECTOR #1 (1-Sec)……….15 N    @  05:32 A.M.
VECTOR #2 (1-Sec)……….15 N    @  05:45 A.M.
DAVIS #1……………….14 NNW  @  05:06 A.M.
DAVIS #2 ………………14 N    @  04:40 A.M.
RMY #1 (Instantaneous)…..14 N    @  04:40 A.M.
RMY #2 (Instantaneous)…..15 N    @  04:48 A.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……14      @  04:45 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………11 N    @  05:19 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..11      @  05:32 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..12      @  05:11 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………11 N    @  05:11 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………11 N    @  04:46 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..11 N    @  05:11 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..12 N    @  05:12 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………11      @  05:11 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..5.6 N [134 total miles] VECTOR #1………………6.8
VECTOR #2………………7.1
DAVIS #1……………….6.5 NNE
DAVIS #2……………….6.8 NE
RMY #1…………………6.8 NNE
RMY #2…………………7.2 NE
RICHARDS (C5C)………….7.2

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.19
TOTAL PRECIPITATION FOR THE MONTH…………..0.23 DEPARTURE…..-2.69
TOTAL PRECIPITATION FOR THE YEAR…………..47.45 DEPARTURE…..+5.86

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

10/1  68/50/59/+1/0.00/458/65             20 NNE VEC1 20 NNE RMY 19
10/2  68/55/62/+4/0.00/681/97             24 NE  VEC1 23 NE  RMY 24
10/3  81/54/68/+11/0.00/672/96            18 WSW VEC1 18 WSW RMY 18
10/4  81/64/73/+16/0.00/669/96            17 S   VEC1 17 S   RMY 16
10/5  77/59/68/+11/0.00/638/92            24 S   VEC1 24 S   RMY 23
10/6  71/60/66/+10/0.00/269/39            20 SE  VEC1 19 SE  RMY 18
10/7  68/54/61/+5/0.16/007/01             30 WNW VEC1 29 WNW RMY 29
10/8  63/48/56/+1/0.00/651/95             30 W   VEC1 30 WNW RMY 30
10/9  61/44/53/-2/0.00/532/78             25 WSW VEC1 24 WSW RMY 25
10/10 64/47/56/+1/T/245/36                23 W   VEC1 22 W   RMY 21
10/11 68/50/59/+5/0.00/393/58             23 SSW VEC1 22 SW  RMY 22
10/12 69/51/60/+6/0.00/…/..             18 NW  VEC1 18 NNW RMY 18
10/13 61/43/52/-2/0.00/…/..             33 NW  VEC1 31 NW  RMY 34
10/14 60/44/52/-1/0.00/…/..             24 NW  VEC1 23 NW  RMY 23
10/15 59/44/52/-1/0.00/…/..             24 NNW VEC1 25 NNW RMY 25
10/16 58/44/51/-1/0.07/…/..             17 WNW VEC1 17 WNW RMY 17
10/17 60/45/53/+1/T/…/..                15 N   VEC1 15 N   RMY 14

10/18 The low since midnight is 49F, the daily normal low is 43F

————————————————————–

OCTOBER DAILY RECORDS TO DATE

.NONE…

————————————————————–

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

RECORDS FOR OCTOBER 18
HIGH 82F IN 1908
LOW 26F IN 1939
PRECIP 2.79 INCHES IN 1975
SNOWFALL 3.0 INCHES IN 2009
PEAK GUST 66 MPH S IN 1967

RECORDS FOR OCTOBER 19
HIGH 81F IN 1945
LOW 21F IN 1922
PRECIP 3.64 INCHES IN 1932
SNOWFALL 1.0 INCHES IN 1972
PEAK GUST 66 MPH SSW IN 1967

TODAY’S REPORT PREPARED BY: Joshua Polen/Matt Douglas

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
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