Tuesday, October 31, 2023

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

TUESDAY, OCTOBER 31, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0616E
SUNSET: 1639E

MAINLY SUNNY AND CHILLY ON THIS HALLOWEEN AT BLUE HILL…

Skies have mainly featured plenty of sunshine as early morning
clouds moved offshore, being replaced by a few diurnal strato-
cumulus clouds early this afternoon.

The temperature finally dropped below the 40F degree mark during
the wee hours of this morning. The minimum temperature so far
for today is 35F (34.9F) degrees, and this set a new record for
the latest temperature below 40F here at Blue Hill.

Here are the updated rankings.

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

1) 31 October 2023 (35F)
2) 24 October 2013 (36F)
24 October 2021 (37F)
4) 22 October 1955 (34F)
5) 21 October 2005 (39F)
6) 20 October 1960 (38F)
7) 19 October 2014 (39F)

Readings have only recovered to the mid to upper 40s early this
afternoon. Dew point readings have been in the mid to upper 20s
all day today, so this definitely adds a marked chill to the air.
Today feels more like mid November than late October!

The wind was steady overnight, but decreased markedly during the
morning hours. The average speed for the day thus far is around
9mph, but again, the trend is downward. The peak gust is around
24mph, which occurred just after midnight.

Visibility has been exceptional all day with the view holding at
around 80 miles. This is due to the rather dry airmass over the
region today.

The maximum temperature so far today is 48F, which is 8 degrees
below the normal high of 56F. The minimum temperature since
midnight is 35F, which is 4 degrees below the normal low of 39F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Thin broken cirrus, few stratocumulus distant NE-SE-WSW,
few altocumulus ENE-S-SW
Temperature: 36F; Dew Point: 29F; Relative Humidity: 76%
Wind: NNW @ 8 kts
Sea-level pressure: 1019.6 mb; 30.11 in. Hg: rising, then more rapidly
Visibility: 80 miles
6-hr Max temp: 40F
6-hr Min temp: 35F
24-hr Precip: 0.45 inches
BHO SA 1155 E250 -BKN 80 196/36/29/3408/011/ FEW SC DSNT NE-SE-WSW
FEW AC ENE-S-SW/ 8/551 53025 70045 10040 20035

10 A.M.
Weather: Clear, few stratocumulus distant all quadrants,
few altocumulus distant ENE-SSW, few cirrus overhead-ENE-SW
Temperature: 43F; Dew Point: 28F; Relative Humidity: 54%
Wind: NNW @ 5 kts, wind light
Sea-level pressure: 1020.7 mb; 30.14 in. Hg: rising, then steady
Visibility: 80 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 80 207/43/28/3405/014/ FEW SC DSNT ALQDS FEW AC DSNT
ENE-SSW FEW CI OVHD-ENE-SW WND LGT/ 8/551 51011

1 P.M.
Weather: Clear, few stratocumulus distant all quadrants,
few altocumulus distant ESE-SW, few cirrus distant ENE-SW
Temperature: 46F; Dew Point: 24F; Relative Humidity: 40%
Wind: NNW @ 2 kts, wind light
Sea-level pressure: 1019.3 mb; 30.10 in. Hg: falling unsteadily
Visibility: 80 miles
6-hr Max temp: 48F
6-hr Min temp: 36F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 80 193/46/24/3302/010/ FEW SC DSNT ALQDS FEW AC DSNT
ESE-SW FEW CI DSNT ENE-SW WND LGT/ 8/551 57014 10048 20036

————————————————————–

SUMMARY FOR MONDAY, OCTOBER 30, 2023

TEMPERATURE (DEGREES F)
MAX…….52 NORMAL…..56
MIN…….41 NORMAL…..39
MEAN……47 NORMAL…..48

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-1
TOTAL DEPARTURE FOR THE MONTH………………..+166 [+5.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………18 DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………..228 DEPARTURE……-148
TOTAL HEATING UNITS FOR THE SEASON………….327 DEPARTURE……-167
TOTAL HEATING UNITS LAST SEASON TO DATE……..405 DEPARTURE…….-78

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH……………26 DEPARTURE…….+19
TOTAL COOLING UNITS FOR THE SEASON………….715 DEPARTURE…….+38
TOTAL COOLING UNITS LAST SEASON TO DATE……..884 DEPARTURE……-169

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)……….E25 NNW @ 11:30 P.M.
VECTOR #1 (1-Sec)……….25 NNW @ 11:24 P.M.
VECTOR #2 (1-Sec)……….28 N @ 11:28 P.M.
DAVIS #1……………….23 NNW @ 10:28 P.M.
DAVIS #2 ………………26 N @ 11:28 P.M.
RMY #1 (Instantaneous)…..27 NNW @ 11:28 P.M.
RMY #2 (Instantaneous)…..29 N @ 11:28 P.M.
MERLIN…………………23 NNW
RICHARDS (C5C) (Inst)……25 @ 10:25 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 NNW @ 11:02 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17 @ 11:26 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 @ 11:24 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 NNW @ 11:25 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 N @ 11:07 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 NNW @ 11:25 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 NNW @ 11:24 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18 @ 11:25 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..7.5 NNW [179 total miles] VECTOR #1………………7.9
VECTOR #2………………8.0
DAVIS #1……………….M
DAVIS #2……………….7.7 ENE
RMY #1…………………7.8 NE
RMY #2…………………7.9 NE
RICHARDS (C5C)………….8.4

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.45 DEPARTURE…..+0.28
TOTAL PRECIPITATION FOR THE MONTH…………..1.97 DEPARTURE…..-3.34
TOTAL PRECIPITATION FOR THE YEAR…………..49.19 DEPARTURE…..+5.21

————————————————————–

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/+8/0.00/557/85 31 SSW VEC1 30 SSW RMY 33
10/20 63/55/57/+6/0.01/000/00 28 SSE VEC1 26 SE RMY 26
10/21 58/52/55/+4/0.76/000/00 40 NW VEC1 41 NW RMY 44
10/22 56/45/51/+1/0.00/382/59 36 WNW VEC1 35 WNW RMY 36
10/23 62/42/52/+2/0.01/386/60 24 NW VEC1 22 NNW RMY 23
10/24 61/41/51/+1/0.00/424/66 28 SW VEC1 26 SW RMY 29
10/25 75/50/63/+14/0.00/472/74 26 SSW VEC1 26 SSW RMY 27
10/26 79/59/69/+20/0.00/515/81 20 WSW VEC1 19 WSW RMY 20
10/27 77/59/68/+19/0.00/380/60 23 WSW VEC1 22 WSW RMY 23
10/28 80/57/69/+21/0.00/625/99 31 W VEC1 31 W RMY 31
10/29 57/44/51/+3/0.41/000/00 25 E VEC1 24 E RMY 25
10/30 52/41/47/-1/0.55/000/00 25 NNW VEC1 25 NNW RMY 27