Wednesday, October 2, 2024

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

WEDNESDAY, OCTOBER 2, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0543E
SUNSET:  1723E

MORE CLOUDS THAN SUN AND SEASONALLY MILD WITH AN ONSHORE FLOW….

We’ve seen a bit more sun today than yesterday, however clouds
continue to dominate the sky today with a coolish onshore flow
keeping temperatures near seasonal levels, at least in terms of
daytime readings. A few very light sprinkles moved through this
morning as well, leaving only a trace of rain.

Temperatures have warmed into the mid 60s again today (almost a
carbon copy of yesterday). Dew point readings are generally
holding in the mid 50s again today.

The wind started the day on the lighter side, however it has
been picking up a bit early this afternoon, gusting at times to
around 20mph. The average speed for the day so far is around
8mph, generally out of an easterly direction. The peak gust so
far is 20mph, which occurred during the 1pm observation period.

Visibility has been holding at around 30-40 miles most of the
day, except early this morning we could only see about 15 miles
to the WSW-NW thanks to a fog bank that was sitting off in those
quadrants.

The maximum temperature so far today is 66F, which is equal to
the normal high of 66F. The minimum temperature since midnight
is 52F, which is 3 degrees above the normal low of 49F.

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PRELIMINARY STATS FOR SEPTEMBER 2024

TEMPERATURE, Deg. F
Avg. Max. 73.5 [+0.8] Avg. Min. 56.2 [+0.6] Mean      64.9 [+0.7] 24-hour corrected mean: 63.8
Max. for month: 85F on the 13th
Min. for month: 49F on the 3rd

HEATING DEGREE DAYS
Total heating units:     59 [-041] Total for the season:    70 [-048] Total for last season:   99

COOLING DEGREE DAYS
Total cooling units:     63 [-011] Total for the season:   757 [+087] Total for last season:  689

PRECIPITATION, Inches
Total: 1.83 [-2.23] Greatest in 24 hrs: 1.13 on the 21st

SNOWFALL, Inches
Total: 0.0 [ 0.0] Greatest in 24 hrs: 0.0 on the N/A

WIND, mph
Avg. uncorrected wind speed: 8.7 mph
Avg. corrected wind speed:   9.4 mph
Prevailing wind direction:   Northeast [12%] Peak gust and direction:  38 NE on the 20th

SUNSHINE:
Campbell-Stokes card minutes: 11982 of a possible 21582, or 56%
Astronomical total minutes: 12342 of a possible 22400, or 56%

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Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, broken cirrocumulus, few lower
stratocumulus all quadrants, fog bank distant WNW-NW below inversion
Temperature: 54F; Dew Point: 53F; Relative Humidity: 96%
Wind: NE @ 8 kts
Sea-level pressure: 1017.7 mb; 30.05 in. Hg: rising, then falling
Visibility: 30 miles, 15 miles WSW-NW
6-hr Max temp: 55F
6-hr Min temp: 52F
24-hr Precip:  Trace
BHO SA 1155 E35 BKN 200 BKN 30 177/54/53/0408/005/ FEW LWR SC ALQDS
F BNK DSNT WSW-NW BLW INVRSN VSBY 15 WSW-NW/ 8/509 58001 70000
10055 20052

10 A.M.
Weather: Broken cumulus, broken stratocumulus, broken cirrocumulus
Temperature: 62F; Dew Point: 53F; Relative Humidity: 72%
Wind: ESE @ 5 kts, wind light
Sea-level pressure: 1018.5 mb; 30.08 in. Hg: rising, then more slowly
Visibility: 30 miles, hazy
3-hr Precip: Trace
BHO SA 1455 E20 BKN 35 BKN 180 BKN 30 185/62/53/1105/008/ HAZY WND LGT/
8/809 51008 6000/

1 P.M.
Weather: Broken cumulus, broken stratocumulus, broken cirrocumulus
Temperature: 63F; Dew Point: 53F; Relative Humidity: 69%
Wind: ENE @ 10G17 kts
Sea-level pressure: 1017.5 mb; 30.05 in. Hg: falling, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 66F
6-hr Min temp: 54F
6-hr Precip: Trace
BHO SA 1755 E32 BKN 44 BKN 170 BKN 40 175/63/53/0710G17/005/ HAZY/
8/809 58010 6000/ 10066 20054

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SUMMARY FOR TUESDAY, OCTOBER 1, 2024

TEMPERATURE (DEGREES F)
MAX…….66  NORMAL…..67
MIN…….55  NORMAL…..50
MEAN……61  NORMAL…..58

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+3
TOTAL DEPARTURE FOR THE MONTH……………………..+3 [+2.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….4  DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE MONTH…………….4  DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE SEASON…………..74  DEPARTURE…….-51
TOTAL HEATING UNITS LAST SEASON TO DATE……..105  DEPARTURE…….-31

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE SEASON………….757  DEPARTURE…….+86
TOTAL COOLING UNITS LAST SEASON TO DATE……..689  DEPARTURE…….+68

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated

F420C (Official)……….E28 ENE  @   12:40 P.M.
VECTOR #1 (1-Sec)……….28 ENE  @   12:40 P.M.
VECTOR #2 (1-Sec)……….29 ENE  @   01:02 P.M.
DAVIS #1……………….27 ENE  @   12:40 P.M.
DAVIS #2 ………………27 E    @   01:02 P.M.
RMY #1 (Instantaneous)…..29 ENE  @   12:58 P.M.
RMY #2 (Instantaneous)…..29 ENE  @   01:02 P.M.
MERLIN…………………26 ENE
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 ENE  @   01:04 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18      @   12:40 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20      @   01:00 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 ENE  @   01:04 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 E    @   01:03 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 ENE  @   01:04 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 ENE  @   01:00 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..9.7 ENE [232 total miles] VECTOR #1………………9.3
VECTOR #2……………..10.4
DAVIS #1………………10.3 ENE
DAVIS #2………………10.4 ENE
RMY #1…………………9.5 ENE
RMY #2………………..10.1 NE
RICHARDS (C5C)………….OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH………….TRACE DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE YEAR (2024)…….43.04 DEPARTURE…..+4.20

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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   82/67/75/+6/T/244/31                28 SSW VEC1 27 SW  RMY 28
9/2   79/56/68/-1/0.00/644/82             31 NNW VEC1 31 NNW RMY 32
9/3   74/49/62/-6/0.00/766/98             23 NW  VEC1 23 NNW RMY 23
9/4   80/56/68/0/0.00/732/94              18 ESE VEC1 19 SE  RMY 18
9/5   77/58/68/0/0.00/737/95              20 ESE VEC1 19 ESE RMY 19
9/6   73/58/66/-2/0.00/240/31             22 E   VEC1 21 ENE RMY 23
9/7   77/56/67/0/0.04/301/39              34 WNW VEC1 31 WNW RMY 33
9/8   70/50/60/-7/0.00/753/98             35 W   VEC1 35 W   RMY 34
9/9   75/51/63/-4/0.00/727/95             31 WNW VEC1 28 WNW RMY 30
9/10  78/56/67/+1/0.00/717/94             21 NW  VEC1 20 SW  RMY 21
9/11  78/53/66/0/0.00/714/94              20 S   VEC1 19 S   RMY 18
9/12  82/58/70/+4/0.00/711/94             20 S   VEC1 19 S   RMY 20
9/13  85/59/72/+7/0.00/595/79             21 SSW VEC1 20 SSW RMY 20
9/14  81/61/71/+6/0.00/691/92             21 ENE VEC1 20 ENE RMY 21
9/15  78/60/69/+4/0.00/598/80             23 SE  VEC1 23 SE  RMY 25
9/16  83/55/69/+5/0.00/700/94             22 SSW VEC1 21 SSW RMY 21
9/17  83/55/69/+5/0.00/453/61             16 SW  VEC1 14 S   RMY 15
9/18  77/60/69/+6/0.00/163/22             15 W   VEC1 14 W   RMY 14
9/19  69/60/65/+2/0.10/000/00             30 NE  VEC1 30 NE  RMY 31
9/20  64/58/61/-2/0.12/000/00             38 NE  VEC1 38 NE  RMY 40
9/21  58/55/57/-5/1.13/000/00             35 NNE VEC1 31 NNE RMY 31
9/22  63/54/59/-3/0.01/190/26             35 NE  VEC1 31 NE  RMY 34
9/23  62/52/57/-5/T/058/08                28 ENE VEC1 27 NE  RMY 27
9/24  61/51/56/-5/0.01/087/12             25 ENE VEC1 22 ENE RMY 24
9/25  65/56/61/0/0.00/029/04              18 E   VEC1 18 ESE RMY 18
9/26  67/56/62/+2/0.42/000/00             26 S   VEC1 26 S   RMY 29
9/27  77/60/69/+9/0.00/450/63             17 W   VEC1 17 W   RMY 15
9/28  72/57/65/+6/0.00/441/62             20 E   VEC1 20 E   RMY 21
9/29  64/55/60/+1/0.00/014/02             16 ENE VEC1 15 NE  RMY 15
9/30  71/54/63/+4/0.00/677/96             17 ENE VEC1 16 ENE RMY 17

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SEPTEMBER DAILY RECORDS TO DATE

NONE.

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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  66/55/61/+3/T/…/..                28 ENE VEC1 28 ENE RMY 29

10/2  The low since midnight is 52F, the daily normal low is 49F.

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OCTOBER DAILY RECORDS TO DATE

NONE.

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

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

RECORDS FOR OCTOBER 3
HIGH 82F IN 1922
LOW 28F IN 1899
PRECIP 1.76 INCHES IN 1979
PEAK GUST 62 MPH WNW IN 1964

TODAY’S REPORT PREPARED BY: Matt Douglas