Thursday, October 5, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, OCTOBER 5, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0545E
SUNSET: 1719E
UNSEASONABLY WARM TEMPERATURES CONTINUES UNDER MAINLY SUNNY SKIES…
While we had sunshine even at the start of the day here on the
summit, a low deck of clouds and fog left many below with a murky
start to the day. A complete undercast was observed here early this
morning with clear skies and 15 miles visibility above it. It was
quite the view!
Since then, the low clouds and fog have burned off leaving everyone
with plenty of sunshine into this afternoon. Temperatures have once
again responded nicely to the heating from the sun with readings
getting well up into the 70s. These temperatures are still running
10-15 degrees above the expected normals for this time of year. The
dew point also remains on the higher side with values in the low 60s,
making for a bit of a humid feel out there.
The wind has been light again today out of mainly a southerly
direction. The average speed so far is only around 8mph, with a peak
gust so far of around 20mph.
Visibility was limited early this morning due to fog and haze, but
has improved into early this afternoon. After starting the day with
only being able to see about 15 miles, we can now see upwards to 40
miles early this afternoon.
The maximum temperature so far today has been 77F, which is 12
degrees above the normal high of 65F. The minimum temperature
since midnight is 59F, which is 11 degrees above the normal low
of 48F.
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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%
————————————————————–
Today’s Observations:
7 A.M.
Weather: Undercast, sky clear above, few cirrus distant W
Temperature: 62F; Dew Point: 60F; Relative Humidity: 95%
Wind: SSW @ 5 kts, wind light
Sea-level pressure: 1025.8 mb; 30.29 in. Hg: rising, then more rapidly
Visibility: 15 miles, 1/2 variable 2 miles NE-SSE
6-hr Max temp: 63F
6-hr Min temp: 59F
24-hr Precip: 0.00 inches
BHO SA 1155 ///OVC 15 258/62/60/2005/029/ SKY CLR ABV UNDERCAST
FEW CI DSNT W F OCNLY DRFTG OVR SMT VSBY 1/2V2 NE-SSE WND LGT/
8/601 53007 10063 20059
10 A.M.
Weather: Clear, few stratus fractus SE-SW-NW, few cirrus distant WSW-NNE
Temperature: 71F; Dew Point: 62F; Relative Humidity: 72%
Wind: SSW @ 6 kts, wind light
Sea-level pressure: 1026.4 mb; 30.31 in. Hg: rising, then falling
Visibility: 15 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 15 264/71/62/2006/031/ FEW STFRA SE-SW-NW FEW CI DSNT
WSW-NNE HAZY WND LGT/ 8/701 50006
1 P.M.
Weather: Clear, few small cumulus NE-S, few cirrus SW-NW-NE
Temperature: 76F; Dew Point: 61F; Relative Humidity: 60%
Wind: SSW @ 8 kts
Sea-level pressure: 1024.5 mb; 30.25 in. Hg: falling, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 77F
6-hr Min temp: 62F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 40 245/76/61/2008/025/ FEW SML CU NE-S FEW CI SW-NW-NE
HAZY/ 8/101 58019 10077 20062
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SUMMARY FOR WEDNESDAY, OCTOBER 4, 2023
TEMPERATURE (DEGREES F)
MAX…….81 NORMAL…..66
MIN…….64 NORMAL…..49
MEAN……73 NORMAL…..57
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+16
TOTAL DEPARTURE FOR THE MONTH…………………+32 [+7.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH…………….9 DEPARTURE…….-23
TOTAL HEATING UNITS FOR THE SEASON………….108 DEPARTURE…….-42
TOTAL HEATING UNITS LAST SEASON TO DATE……..151 DEPARTURE…….-43
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….8 DEPARTURE……..+7
TOTAL COOLING UNITS FOR THE MONTH……………11 DEPARTURE……..+9
TOTAL COOLING UNITS FOR THE SEASON………….700 DEPARTURE…….+27
TOTAL COOLING UNITS LAST SEASON TO DATE……..884 DEPARTURE……-184
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)……….E17 S @ 09:28 P.M.
VECTOR #1 (1-Sec)……….17 S @ 09:28 P.M.
VECTOR #2 (1-Sec)……….15 S @ 09:17 P.M.
DAVIS #1……………….15 SSE @ 08:19 P.M.
DAVIS #2 ………………19 S @ 09:15 P.M.
RMY #1 (Instantaneous)…..16 S @ 09:28 P.M.
RMY #2 (Instantaneous)…..16 S @ 09:17 P.M.
MERLIN…………………14 S
RICHARDS (C5C) (Inst)……15 @ 09:28 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………12 NNE @ 04:47 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..11 @ 09:17 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..12 @ 09:15 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………12 E @ 04:47 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 S @ 09:07 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..11 SSW @ 11:56 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..13 S @ 09:15 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………11 @ 09:16 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..6.9 ENE [165 total miles]
VECTOR #1………………7.7
VECTOR #2………………8.3
DAVIS #1……………….7.6 E
DAVIS #2……………….8.0 E
RMY #1…………………7.7 ENE
RMY #2…………………8.2 ENE
RICHARDS (C5C)………….8.1
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.16
TOTAL PRECIPITATION FOR THE MONTH…………..0.00 DEPARTURE…..-0.66
TOTAL PRECIPITATION FOR THE YEAR…………..47.22 DEPARTURE…..+7.89
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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
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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
————————————————————–
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 The low since midnight is 59F, the daily normal low is 48F
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR OCTOBER 5
HIGH 86F IN 2007
LOW 29F IN 1965
PRECIP 3.17 INCHES IN 1962
PEAK GUST 64e MPH S IN 1979
RECORDS FOR OCTOBER 6
HIGH 83F IN 1990, 2007
LOW 26F IN 1965
PRECIP 3.78 INCHES IN 1962
PEAK GUST 60e MPH S IN 1942
TODAY’S REPORT PREPARED BY: Matt Douglas
