Tuesday, September 26, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, SEPTEMBER 26, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0536E
SUNSET: 1735E
ANOTHER OVERCAST, CHILLY, AND BREEZY DAY HERE AT BLUE HILL…
Clouds continue to rule the sky for yet another day, however
there are some signs of change as some breaks in the overcast
have developed early this afternoon. Off and on light rain
showers were around this morning, but came to an end by late
morning as drier air works it’s way into the region from the
north. These light showers didn’t leave anything measurable
in the gauge however.
Temperatures have remained on the cool side once again, thanks
to the cloud cover and a continued brisk wind off the ocean.
Readings have generally been sitting in the mid 50s so far
today. The dew point has begun to edge downward however, with
readings getting into the upper 40s early this afternoon.
The wind has gradually backed from the east-northeast to
northeast. It has been gusty once again today with an average
speed of around 14mph, and frequent gusts over 20mph. The peak
for the day to this point has been 36mph, occurring just
before 2am this morning.
Visibility has been gradually improving as drier air moves into
the region. Views increased from around 15 miles early this
morning to around 30-40 miles early this afternoon.
The maximum temperature so far today has been 57F, which is
12 degrees below the normal high of 69F. The minimum temperature
since midnight is 54F, which is 2 degrees above the normal low
of 52F.
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Today’s Observations:
7 A.M.
Weather: Broken stratus fractus, overcast stratocumulus, intermittent
light rain
Temperature: 55F; Dew Point: 53F; Relative Humidity: 94%
Wind: NE @ 14G24 kts
Sea-level pressure: 1029.2 mb; 30.39 in. Hg: rising unsteadily
Visibility: 15 miles, thin fog
6-hr Max temp: 57F
6-hr Min temp: 55F
24-hr Precip: 0.10 inches
BHO SA 1155 E11 BKN 20 OVC 15 292/55/53/0514G24/039/ THN F ALQDS
INTMT R-/ 8/7// 52013 6000/ 70010 10057 20055
10 A.M.
Weather: Overcast stratocumulus
Temperature: 54F; Dew Point: 50F; Relative Humidity: 87%
Wind: NE @ 13G22 kts
Sea-level pressure: 1030.9 mb; 30.44 in. Hg: rising, then more slowly
Visibility: 25 miles, thin fog
3-hr Precip: Trace
BHO SA 1455 E23 OVC 25 309/54/50/0513G22/044/ THN F ALQDS/
8/5// 51017 6000/
1 P.M.
Weather: Overcast stratocumulus, few breaks in overcast all quadrants,
higher clouds visible NW
Temperature: 55F; Dew Point: 47F; Relative Humidity: 74%
Wind: NE @ 13G24 kts
Sea-level pressure: 1030.6 mb; 30.43 in. Hg: rising, then falling
Visibility: 35 miles, hazy
6-hr Max temp: 57F
6-hr Min temp: 54F
6-hr Precip: Trace
BHO SA 1755 E23 OVC 35 306/55/47/0413G24/043/ FEW BINOVC ALQDS
HIER CLDS VSBL NW HAZY/ 8/5// 58003 6000/ 10057 20054
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SUMMARY FOR MONDAY, SEPTEMBER 25, 2023
TEMPERATURE (DEGREES F)
MAX…….60 NORMAL…..69
MIN…….55 NORMAL…..52
MEAN……58 NORMAL…..61
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-3
TOTAL DEPARTURE FOR THE MONTH…………………+67 [+2.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….7 DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH……………48 DEPARTURE…….-20
TOTAL HEATING UNITS FOR THE SEASON…………..49 DEPARTURE…….-37
TOTAL HEATING UNITS LAST SEASON TO DATE………70 DEPARTURE…….-21
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………..119 DEPARTURE…….+49
TOTAL COOLING UNITS FOR THE SEASON………….689 DEPARTURE…….+23
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)……….E38 ENE @ 11:20 P.M.
VECTOR #1 (1-Sec)……….40 ENE @ 11:20 P.M.
VECTOR #2 (1-Sec)……….41 ENE @ 11:20 P.M.
DAVIS #1……………….40 E @ 09:45 P.M.
DAVIS #2 ………………41 ENE @ 11:20 P.M.
RMY #1 (Instantaneous)…..41 ENE @ 09:46 P.M.
RMY #2 (Instantaneous)…..43 ENE @ 11:20 P.M.
MERLIN…………………35 ENE
RICHARDS (C5C) (Inst)……37 @ 10:57 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………26 ENE @ 11:22 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21 @ 11:20 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25 @ 11:03 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………25 ENE @ 11:08 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 E @ 09:12 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..23 ENE @ 09:48 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..24 E @ 09:12 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………23 @ 09:47 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..15.8 ENE [379 total miles]
VECTOR #1………………14.4
VECTOR #2………………15.9
DAVIS #1……………….16.0 ENE
DAVIS #2……………….15.9 ENE
RMY #1…………………14.5 ENE
RMY #2…………………15.4 ENE
RICHARDS (C5C)………….15.0
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.10 DEPARTURE…..-0.06
TOTAL PRECIPITATION FOR THE MONTH…………..6.17 DEPARTURE…..+2.86
TOTAL PRECIPITATION FOR THE YEAR…………..46.62 DEPARTURE…..+8.70
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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 70/56/63/0/0.00/665/90 35 WNW VEC1 37 WNW RMY 36
9/20 72/53/63/0/0.00/714/97 21 WNW VEC1 21 WNW RMY 22
9/21 71/52/62/0/0.00/661/90 17 NNW VEC1 17 NNW RMY 17
9/22 68/54/61/-1/0.00/570/78 23 E VEC1 21 E RMY 22
9/23 58/54/56/-6/0.24/000/00 30 NE VEC1 30 NE RMY 27
9/24 60/56/58/-3/0.73/000/00 30 ENE VEC1 30 ENE RMY 29
9/25 60/55/58/-3/0.13/000/00 38 ENE VEC1 40 ENE RMY 41
9/26 The low since midnight is 54, the daily normal low is 52F
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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
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 26
HIGH 91F IN 2007
LOW 36F IN 1905,1922,1978
PRECIP 3.84 INCHES IN 1888
PEAK GUST 54e MPH S IN 1977
RECORDS FOR SEPTEMBER 27
HIGH 86F IN 2017
LOW 32F IN 1947
PRECIP 2.26 INCHES IN 1962
PEAK GUST 100 MPH SSE IN 1985 (HURRICANE GLORIA)
TODAY’S REPORT PREPARED BY: Matt Douglas
