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Saturday, September 23, 2023

September 23, 2023

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, SEPTEMBER 23, 2023 ALL TIMES ARE…

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

SATURDAY, SEPTEMBER 23, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0532E
SUNSET:  1740E

GLOOMY FIRST DAY OF EQUINOCTIAL AUTUMN…

Happy autumnal equinox! Conditions weren’t the greatest here today.
The day has been overcast with cool daytime temperatures in the 50’s.
Dew Points have also been in the 50’s making for a rather humid day.
Light drizzle began around 9:40 this morning and continued on and
off throughout observation time. A total of 0.01 inches was measured
at 1:00 P.M. Wind, from the east/ east north east has been mild again
averaging around 10 MPH.

Visibility was diminished today and decreased from 35 miles to 20 miles
as the precipitation moved into the area.

The maximum temperature so far today has been 58F, which is 12 degrees
below the normal high of 70F. The minimum temperature since midnight is
a seasonable 54F, which is 1 degrees above the normal low of 53F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, broken altocumulus, overcast altostratus
Temperature: 55F; Dew Point: 50F; Relative Humidity: 82%
Wind: E @ 10 kts
Sea-level pressure: 1027.2 mb; 30.33 in. Hg: falling unsteadily
Visibility: 35 miles
6-hr Max temp: 60F
6-hr Min temp: 57F
24-hr Precip: 0.00 inches
BHO SA 1155 25 BKN 90 BKN E200 OVC 35 272/55/50/0910/033/ 8/52/
57004 10055 20054

10 A.M.
Weather: Scattered stratus fractus, broken stratocumulus,
overcast altostratus, light drizzle, precipitation very light
Temperature: 58F; Dew Point: 52F; Relative Humidity: 81%
Wind: ENE @ 8 kts
Sea-level pressure: 1026.9 mb; 30.32 in. Hg: falling unsteadily
Visibility: 30 miles
3-hr Precip: Trace
BHO SA 1455 20 SCT E50 BKN 120 OVC 30L- 269/58/52/0708/032/
PCPN VRY LGT/ 57003 6000/

1 P.M.
Weather: Scattered stratus fractus, broken stratocumulus,
overcast altostratus, light drizzle, precipitation very light
Temperature: 57F; Dew Point: 54F; Relative Humidity: 89%
Wind: ENE @ 10 kts
Sea-level pressure: 1024.7 mb; 30.26 in. Hg: falling rapidly
Visibility: 20 miles
6-hr Max temp: 58F
6-hr Min temp: 55F
6-hr Precip: 0.01 inches
BHO SA 1755 12 SCT 20 BKN E120 OVC 20L- 247/57/54/0710/026/ PCPN
VRY LGT PRESFR/ 58022 60001 10058 20055

————————————————————–

SUMMARY FOR FRIDAY, SEPTEMBER 22, 2023

TEMPERATURE (DEGREES F)
MAX…….68   NORMAL…..70
MIN…….54   NORMAL…..53
MEAN……61   NORMAL…..62

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-1
TOTAL DEPARTURE FOR THE MONTH…………………+79 [+3.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….4  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH……………25  DEPARTURE…….-27
TOTAL HEATING UNITS FOR THE SEASON…………..26  DEPARTURE…….-44
TOTAL HEATING UNITS LAST SEASON TO DATE………42  DEPARTURE…….-16

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH…………..119  DEPARTURE…….+54
TOTAL COOLING UNITS FOR THE SEASON………….689  DEPARTURE…….+28
TOTAL COOLING UNITS LAST SEASON TO DATE……..884  DEPARTURE……-195

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)……….E20 E    @  01:06 P.M.
VECTOR #1 (1-Sec)……….21 E    @  01:14 P.M.
VECTOR #2 (1-Sec)……….21 E    @  01:16 P.M.
DAVIS #1……………….20 E    @  12:37 P.M.
DAVIS #2 ………………20 N    @  01:02 P.M.
RMY #1 (Instantaneous)…..22 E    @  01:05 P.M.
RMY #2 (Instantaneous)…..21 E    @  01:09 P.M.
MERLIN…………………19 ESE
RICHARDS (C5C) (Inst)……20      @  12:37 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 E    @  01:02 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15      @  01:02 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15      @  01:03 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 E    @  01:03 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 E    @  01:03 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 E    @  01:02 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 E    @  01:03 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16      @  01:02 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.2 E [196 total miles] VECTOR #1……………….7.9
VECTOR #2……………….8.5
DAVIS #1………………..8.8 E
DAVIS #2………………..8.4 E
RMY #1………………….8.3 E
RMY #2………………….8.4 E
RICHARDS (C5C)…………..8.8

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH…………..5.07 DEPARTURE…..+2.21
TOTAL PRECIPITATION FOR THE YEAR…………..45.52 DEPARTURE…..+8.05

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/1   73/52/63/-6/0.00/774/98             23 SSW VEC1 22 SSW RMY 21
9/2   79/56/68/-1/0.00/708/90             25 SW  VEC1 24 SW  RMY 26
9/3   85/61/73/+5/T/674/86                21 SW  VEC1 21 SW  RMY 21
9/4   85/68/77/+9/0.00/719/92             17 NW  VEC1 16 NW  RMY 16
9/5   86/68/77/+9/0.00/647/83             16 NNE VEC1 16 ENE RMY 16
9/6   89/70/80/+12/0.00/722/93            17 WSW VEC1 17 SSW RMY 18
9/7   92/72/82/+15/0.00/726/94            20 SSW VEC1 21 SSW RMY 21
9/8   86/70/78/+11/0.00/293/38            30 SSW VEC1 31 SSW RMY 32 TSTM
9/9   86/68/77/+10/0.49/291/38            30 S   VEC1 31 S   RMY 29 TSTM
9/10  78/67/73/+7/0.25/008/01             17 NE  VEC1 17 NE  RMY 15 TSTM
9/11  74/67/71/+5/0.64/023/03             15 E   VEC1 15 E   RMY 14 TSTM
9/12  79/65/72/+6/T/250/33                18 E   VEC1 17 E   RMY 18
9/13  76/64/70/+5/1.92/242/32             35 SSW VEC1 35 SSW RMY 36 TSTM
9/14  75/57/66/+1/0.00/670/89             24 NW  VEC1 24 NW  RMY 24
9/15  66/53/60/-5/0.00/465/62             36 N   VEC1 35 N   RMY 35
9/16  68/54/61/-3/0.21/022/03             44 WNW VEC1 44 WNW RMY 47
9/17  76/53/65/+1/0.00/685/92             26 WNW VEC1 25 WNW RMY 24
9/18  64/60/62/-1/1.56/000/00             33 WNW VEC1 33 WNW RMY 35 TSTM
9/19  70/56/63/0/0.00/…/..              35 WNW VEC1 37 WNW RMY 36
9/20  72/53/63/0/0.00/…/..              21 WNW VEC1 21 WNW RMY 22
9/21  71/52/62/0/0.00/…/..              17 NNW VEC1 17 NNW RMY 17
9/22  68/54/61/-1/0.00/…/..             20 E   VEC1 21 E   RMY 22

9/23 The low since midnight is 54, the daily normal low is 53F

————————————————————–

SEPTEMBER DAILY RECORDS

09/07/2023: NEW RECORD HIGH DAILY MINIMUM TEMPERATURE OF 72F;
BEATS THE RECORD OF 70F SET IN 1999

09/07/2023: RECORD HIGH TEMPERATURE OF 92F;
TIES THE RECORD OF 92F SET IN 2007 AND 2015

09/08/2023: RECORD HIGH DAILY MINIMUM TEMPERATURE OF 70F;
TIES THE RECORD OF 70F SET IN 2015

————————————————————–

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

RECORDS FOR SEPTEMBER 23
HIGH 93F IN 1895,1914
LOW 33F IN 1904
PRECIP 2.67 INCHES IN 1994
PEAK GUST 62 MPH SSW IN 1989

RECORDS FOR SEPTEMBER 24
HIGH 87F IN 1959
LOW 33F IN 1885,1950,1963
PRECIP 1.19 INCHES IN 1955
PEAK GUST 54e MPH SW IN 1940

TODAY’S REPORT PREPARED BY: Kaitlin Ann Geagan

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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
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