Sunday, October 1, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, OCTOBER 1, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0541E
SUNSET: 1726E
CLOUDS MOVE OUT, BUT SMOKE MOVES IN FILTERING THE SUN AND REDUCING
VISIBILITY…
The sky has been clear today, but it’s hard to discern such a thing
as wildfire smoke has infiltrated the region today. Visibility
has been limited to only around 10 miles thanks to the haziness
associated with the smoke. The smoke has also been thick enough to
significantly filter the sun.
Temperatures are being held back a bit from their potential today
due to the filtered sunshine. Readings have only risen into the
upper 60s so far.
The wind has been steadily decreasing out of a northerly direction.
The average speed for the day is around 10mph. The peak gust so far
has been around 20 mph, which occurred just before 11am this morning.
As mentioned, the visibility is greatly reduced today due to the
smoke. The view has only been around 10 miles all day.
The maximum temperature so far today has been 68F, which is
1 degree above the normal high of 67F. The minimum temperature
since midnight is 50F, which is equal to the normal low of 50F.
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PRELIMINARY STATS FOR SEPTEMBER 2023
TEMPERATURE, Deg. F
Avg. Max. 72.5 [-0.2]
Avg. Min. 58.4 [+2.8]
Mean 65.5 [+1.3]
24-hour corrected mean: 64.6
Max. for month: 92F on the 7th
Min. for month: 46F on the 27th
HEATING DEGREE DAYS
Total heating units: 98 [-002]
Total for the season: 99 [-019]
Total for last season: 99
COOLING DEGREE DAYS
Total cooling units: 119 [+045]
Total for the season: 689 [+019]
Total for last season: 884
PRECIPITATION, Inches
Total: 6.77 [+2.71]
Greatest in 24 hrs: 1.92 on the 13th
SNOWFALL, Inches
Total: 0.0 [0.0]
Greatest in 24 hrs: N/A
WIND, mph
Avg. uncorrected wind speed: 9.6 mph
Avg. corrected wind speed: 10.2 mph
Prevailing wind direction: East-northeast [16%]
Peak gust and direction: 44 WNW on the 17th
SUNSHINE:
Campbell-Stokes card minutes: 11454 of a possible 22582, or 53%
Astronomical total minutes: 11917 of a possible 22465, or 53%
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Today’s Observations:
7 A.M.
Weather: Clear, patchy ground fog all quadrants, smoke layer all quadrants
Temperature: 52F; Dew Point: 52F; Relative Humidity: 99%
Wind: N @ 9 kts
Sea-level pressure: 1022.6 mb; 30.20 in. Hg: steady, then rising
Visibility: 10 miles, thin smoke
6-hr Max temp: 52F
6-hr Min temp: 50F
24-hr Precip: Trace
BHO SA 1155 CLR 10 226/52/52/0109/020/ PTCHY GF ALQDS K LYR ALQDS
SUN DMLY VSBL THRU K LYR/ 8/000 53006 70000 10052 20050
10 A.M.
Weather: Clear, smoke layer all quadrants
Temperature: 61F; Dew Point: 55F; Relative Humidity: 81%
Wind: N @ 7 kts
Sea-level pressure: 1023.0 mb; 30.21 in. Hg: rising, then falling
Visibility: 10 miles, hazy – thin smoke
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 10 230/61/55/0107/021/ K LYR ALQDS SUN DMLY VSBL
THRU K LYR HAZY/ 8/000 50004
1 P.M.
Weather: Clear, smoke layer all quadrants
Temperature: 66F; Dew Point: 58F; Relative Humidity: 74%
Wind: NNE @ 6 kts, wind light
Sea-level pressure: 1021.7 mb; 30.17 in. Hg: falling, then more rapidly
Visibility: 10 miles, hazy – thin smoke
6-hr Max temp: 67F
6-hr Min temp: 52F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 10 217/66/58/0306/017/ K LYR ALQDS SUN DMLY VSBL
THRU K LYR HAZY WND LGT/ 8/000 58013 10067 20052
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SUMMARY FOR SATURDAY, SEPTEMBER 30, 2023
TEMPERATURE (DEGREES F)
MAX…….58 NORMAL…..67
MIN…….52 NORMAL…..50
MEAN……55 NORMAL…..59
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-4
TOTAL DEPARTURE FOR THE MONTH…………………+45 [+1.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………10 DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE MONTH……………98 DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE SEASON…………..99 DEPARTURE…….-19
TOTAL HEATING UNITS LAST SEASON TO DATE………99 DEPARTURE………0
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…….+45
TOTAL COOLING UNITS FOR THE SEASON………….689 DEPARTURE…….+19
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)……….E23 N @ 10:31 P.M.
VECTOR #1 (1-Sec)……….23 NE @ 02:41 A.M.
VECTOR #2 (1-Sec)……….23 NNE @ 10:17 A.M.
DAVIS #1……………….22 E @ 02:39 A.M.
DAVIS #2 ………………21 E @ 02:41 A.M.
RMY #1 (Instantaneous)…..25 NE @ 02:41 A.M.
RMY #2 (Instantaneous)…..24 NNE @ 10:17 A.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……22 @ 02:41 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 NNE @ 06:12 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 @ 02:41 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 @ 02:42 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 NE @ 02:42 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 NE @ 02:42 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 NE @ 02:42 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 NE @ 02:42 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15 @ 02:42 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.7 NNE [256 total miles]
VECTOR #1………………10.8
VECTOR #2………………11.3
DAVIS #1……………….10.9 NNE
DAVIS #2……………….10.8 NE
RMY #1…………………10.6 NNE
RMY #2…………………11.1 NNE
RICHARDS (C5C)………….10.9
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.16
TOTAL PRECIPITATION FOR THE MONTH…………..6.77 DEPARTURE…..+2.71
TOTAL PRECIPITATION FOR THE YEAR…………..47.22 DEPARTURE…..+8.55
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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 57/47/52/-8/T/216/30 36 NE VEC1 37 NE RMY 39
9/27 63/46/55/-5/0.00/652/91 18 ENE VEC1 18 E RMY 18
9/28 65/50/58/-1/0.00/520/73 18 E VEC1 18 E RMY 19
9/29 57/52/55/-4/0.46/000/00 28 NNE VEC1 25 NNE RMY 26
9/30 58/52/55/-4/0.14/000/00 23 N VEC1 23 NE RMY 25
10/1 The low since midnight is 50F, the daily normal low is 50F
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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 OCTOBER 1
HIGH 85F IN 1927
LOW 30F IN 1992
PRECIP 1.63 INCHES IN 2014
PEAK GUST 68e MPH SSE IN 1977
RECORDS FOR OCTOBER 2
HIGH 85F IN 1968
LOW 29F IN 1899
PRECIP 1.75 INCHES IN 1984
PEAK GUST 53 MPH ENE IN 2022
TODAY’S REPORT PREPARED BY: Matt Douglas
