Monday, October 23, 2023

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

MONDAY, OCTOBER 23, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0606E
SUNSET:  1650E

A MIX OF SUN AND CLOUDS WITH SEASONABLE TEMPERATURES AT BLUE HILL…

We’ve seen varying amounts of cloud cover today, but the trend
has been toward more sunshine as we get into the early afternoon
hours.

Temperatures are responding to the sunshine with readings
reaching the low 60s. The dew point has been holding in the
low to mid 40s, keeping things on the very comfortable side.

The wind is much lighter than yesterday with an average speed of
around 9mph so far for the day. The highest gust occurred in
the wee hours of the morning at around 23mph.

Visibility has been excellent today with a view of 70 miles all
day!

The maximum temperature so far today has been 61F, which is 3
degrees above the normal high of 58F. The minimum temperature
since midnight is 42F, which is 1 degree above the normal low
of 41F.

As we continue to remain above normal in the minimum temperature
category, we are actively tracking when we will have our first
low temperature below 40F. If it does not happen tomorrow, 2023
will end up ranking first for the latest temperature below 40.
Here are the current rankings as compiled by our Chief Scientist,
Mike Iacono.

BHO Latest First Minimum Temperature Below 40 deg F (1885-2023):

1) 24 October 2013 (36F)
24 October 2021 (37F)
3) 22 October 1955 (34F)
4) 21 October 2005 (39F)
5) 20 October 1960 (38F)
6) 19 October 2014 (39F)

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Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, broken cirrus, virga distant ENE-SE
Temperature: 44F; Dew Point: 40F; Relative Humidity: 87%
Wind: NNW @ 11G17 kts
Sea-level pressure: 1015.4 mb; 29.99 in. Hg: rising, then more rapidly
Visibility: 70 miles
6-hr Max temp: 44F
6-hr Min temp: 42F
24-hr Precip: 0.01 inches
BHO SA 1155 E20 BKN 250 BKN 70 154/44/40/3311G17/999/ VIRGA DSNT ENE-SE/
8/501 53043 6001/ 70001 10044 20042

10 A.M.
Weather: Scattered stratocumulus, broken altocumulus, broken cirrus
Temperature: 54F; Dew Point: 42F; Relative Humidity: 63%
Wind: NNW @ 6 kts, wind light
Sea-level pressure: 1018.0 mb; 30.06 in. Hg: rising unsteadily
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 25 SCT 100 BKN 250 BKN 70 180/54/42/3306/006/ WND LGT/
8/551 52026

1 P.M.
Weather: Broken stratocumulus, broken cirrus
Temperature: 60F; Dew Point: 45F; Relative Humidity: 57%
Wind: NNW @ 8 kts
Sea-level pressure: 1018.5 mb; 30.08 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 61F
6-hr Min temp: 44F
6-hr Precip: 0.00 inches
BHO SA 1755 E32 BKN 250 BKN 70 185/60/45/3308/008/ 8/501 51005
10061 20044

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SUMMARY FOR SUNDAY, OCTOBER 22, 2023

TEMPERATURE (DEGREES F)
MAX…….56   NORMAL…..59
MIN…….45   NORMAL…..42
MEAN……51   NORMAL…..50

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+1
TOTAL DEPARTURE FOR THE MONTH…………………+87 [+3.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………14  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………..167  DEPARTURE…….-79
TOTAL HEATING UNITS FOR THE SEASON………….266  DEPARTURE…….-97
TOTAL HEATING UNITS LAST SEASON TO DATE……..311  DEPARTURE…….-45

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……..+8
TOTAL COOLING UNITS FOR THE SEASON………….704  DEPARTURE…….+27
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)……….E36 WNW  @  01:31 P.M.
VECTOR #1 (1-Sec)……….35 WNW  @  01:31 P.M.
VECTOR #2 (1-Sec)……….38 WNW  @  01:37 P.M.
DAVIS #1……………….36 WNW  @  01:31 P.M.
DAVIS #2 ………………37 WNW  @  01:37 P.M.
RMY #1 (Instantaneous)…..36 WNW  @  01:31 P.M.
RMY #2 (Instantaneous)…..38 W    @  04:03 A.M.
MERLIN…………………33 W
RICHARDS (C5C) (Inst)……35      @  01:31 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………29 WNW  @  01:31 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..25      @  08:53 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..28      @  01:33 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………27 W    @  08:53 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………27 NW   @  01:33 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..24 WNW  @  08:53 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..27 NW   @  01:33 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………26      @  08:53 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….15.6 WNW [374 total miles] VECTOR #1……………..15.1
VECTOR #2……………..16.0
DAVIS #1………………15.9 W
DAVIS #2………………15.9 WNW
RMY #1………………..14.4 WNW
RMY #2………………..15.6 WNW
RICHARDS (C5C)…………15.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.01 DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..1.01 DEPARTURE…..-2.84
TOTAL PRECIPITATION FOR THE YEAR…………..48.23 DEPARTURE…..+5.71

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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/+6/0.00/479/71             18 NW  VEC1 18 NNW RMY 18
10/13 61/43/52/-2/0.00/638/95             33 NW  VEC1 31 NW  RMY 34
10/14 60/44/52/-1/0.00/247/37             24 NW  VEC1 23 NW  RMY 23
10/15 59/44/52/-1/0.00/226/34             24 NNW VEC1 25 NNW RMY 25
10/16 58/44/51/-1/0.07/166/25             17 WNW VEC1 17 WNW RMY 17
10/17 60/45/53/+1/T/211/32                15 N   VEC1 15 N   RMY 14
10/18 62/49/56/+4/0.00/079/12             15 SSW VEC1 15 SSW RMY 16
10/19 65/50/58/+8/0.00/…/..             31 SSW VEC1 30 SSW RMY 33
10/20 63/55/57/+6/0.01/…/..             28 SSE VEC1 26 SE  RMY 26
10/21 58/52/55/+4/0.76/…/..             40 NW  VEC1 41 NW  RMY 44
10/22 56/45/51/+1/0.00/…/..             36 WNW VEC1 35 WNW RMY 36

10/23 The low since midnight is 42F, the daily normal low is 41F

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OCTOBER DAILY RECORDS TO DATE

.NONE…

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

RECORDS FOR OCTOBER 23
HIGH 82F IN 1947
LOW 24F IN 1969
PRECIP 3.66 INCHES IN 2014
SNOWFALL 3.0 INCHES IN 1891
PEAK GUST 78e MPH NW IN 1941

RECORDS FOR OCTOBER 24
HIGH 79F IN 1963
LOW 22F IN 1969
PRECIP 2.96 INCHES IN 1890
SNOWFALL 1.8 INCHES IN 1960
PEAK GUST 70 MPH SE IN 1959

TODAY’S REPORT PREPARED BY: Matt Douglas