Monday, December 4, 2017

| December 4, 2017 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, DECEMBER 4, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

HIGH PRESSURE BRINGS DRY AND SEASONABLE
AIR TO GREAT BLUE HILL…

Maximum temperatures continue to be close to
the daily normal with a high of 42F. This is
-2 degrees from the normal of 44F. So far today
we have had a high of 43F which is also the daily
normal. Yesterday and overnight we had had
minimum temperatures of 32F. Which is 5 degrees
above the normal of 27F.
With high pressure today the northern winds have
remained light and variable. We have also
observed clear skies with a few cumulus clouds in
the morning increasing to scattered cirrus throughout
the day. A distant haze kept visibility down to
35 miles at 1:00 P.M.

This fall (Sept-Nov) was the warmest in BHO history
with a corrected 24-hour mean temperature of
55.3F. We also observed the warmest October on
record during this fall.

PRELIMINARY STATS FOR NOVEMBER 2017

TEMPERATURE, Deg. F
Avg. Max. 49.8 [-0.2]
Avg. Min. 32.9 [-0.6]
Mean      41.4 [-0.3]
24-hour corrected mean: 41.7
Max. for month: 74F on 3rd
Min. for month: 18F on 11th

HEATING DEGREE DAYS
Total heating units: 701 [+3]
Total for the season: 969 [-292]
Total for last season: 1030

PRECIPITATION, Inches
Total: 2.04 [-2.72]
Greatest in 24 hrs: 0.87 in. on the 22nd

WIND, mph
Avg. uncorrected wind speed: 12.7
Avg. corrected wind speed: 13.0
Prevailing wind direction: WNW at 12%
Peak gust and direction: 50 W on 19th

SUNSHINE:
Campbell-Stokes card minutes: 9,108 minutes of possible 17,010 or 54%
Astronomical total minutes: 9,431 minutes of possible 17,610 or 54%

BHO Warmest Fall (Sep-Nov) 24-hour Corrected Mean Temperature, deg F (1885-2017):

1) 55.3 in 2017
2) 55.1 in 2011
3) 54.8 in 1931
54.8 in 2015
5) 54.3 in 1946
54.3 in 2001

Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant ENE-ESE, few
cirrus SSW-W, inversion present
Temperature: 32F; Dew Point: 29F; Wind: NNE at 10 kts
Sea-level pressure: 30.42 ins. Hg, rising, then more quickly
Visibility: 40 miles, distant fog in all directions
6-hr Max temp: 36F
6-hr Min temp: 32F
24-hr precip: 0.00 ins.
BHO SA 1155 CLR 40 301/32/29/0210/042/ FEW SC DSNT ENE-ESE FEW
CI SSW-W INVSN PRSNT DSNT FG ALQDS/ 8/501 53017 10036 20032

10 A.M.
Weather: Clear, few cumulus distant N-ESE
Temperature: 40F; Dew Point: 31F; Wind: NE at 4 kts,
Wind: Light and variable
Sea-level pressure: 30.48 ins. Hg, rising, then more quickly
Visibility: 40 miles, distant fog in all directions
3-hr precip: 0.00 ins.
BHO SA 1455 CLR 40 321/40/31/0404/048/ FEW CU DSNT N-ESE DSNT FG
ALQDS WND L/V/ 8/100 51020

1 P.M.
Weather: Scattered cirrus, few cumulus distant N-ESE
Temperature: 42F; Dew Point: 31F; Wind: NE at 3 kts (estimated),
Wind: Light and variable
Sea-level pressure: 30.46 ins. Hg, falling, then more slowly
Visibility: 35 miles, distant haze in all directions
6-hr Max temp: 43F
6-hr Min temp: 32F
6-hr precip: 0.00 ins.
BHO SA 1755 300 SCT 35 316/42/31/E0403/046/ FEW CU DSNT N-ESE
DSNT HZ ALQDS WND L/V/ 8/101 58005 10043 20032

SUMMARY FOR SUNDAY, DECEMBER 3, 2017

TEMPERATURE (DEGREES F)
MAX…..42   NORMAL…..44
MIN…..32   NORMAL…..28
MEAN….37   NORMAL…..36

DEPARTURE FROM 30-YEAR NORMAL………………………+1
TOTAL DEPARTURE FOR THE MONTH………………………+7 [+2.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….28  DEPARTURE……….-1
TOTAL HEATING UNITS FOR THE MONTH………….79  DEPARTURE……….-8
TOTAL HEATING UNITS FOR THE SEASON……….1048  DEPARTURE……..-300
TOTAL HEATING UNITS LAST SEASON TO DATE…..1099  DIFFERENCE……..-51

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….14 NNW AT 5:41 A.M.***
AERO……………………10 NW  AT 1:33 P.M.
ASOS……………………11 NW  AT 1:33 P.M.
DAVIS…………………..10 N   AT 3:30 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….9 N   AT 5:31 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………10 NNE AT 5:35 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………9 N   AT 3:49 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..5.0 NNW
ASOS…………………..5.3
DAVIS………………….5.0 N [012 DEG.]
*** LAST OF MULTIPLE PEAK GUSTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.04  DEPARTURE……-0.45
ASOS…………..0.04
TOTAL PRECIPITATION FOR THE YEAR……….49.88  DEPARTURE……+0.86
ASOS……………N/A **
** ASOS annual total not available due to erroneous readings

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.3
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE…….-0.8
TOTAL SNOWFALL FOR THE SEASON……………0.0  DEPARTURE…….-3.4

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

11/01 53/39/46/0/0.00/167/27           25 SE  AERO 24 SE  RMY 25
11/02 71/49/60/+14/0.00/000/00         28 SSE AERO 25 SSE RMY 27
11/03 74/47/61/+15/T/350/57            35 WNW AERO 35 WNW RMY 38
11/04 54/39/47/+2/0.00/545/89          31 NW  AERO 31 NW  RMY N/A
11/05 61/46/54/+9/0.01/006/01          26 S   AERO 24 S   RMY N/A
11/06 64/47/56/+11/0.05/000/00         32 S   AERO 28 SSW RMY 35
11/07 46/35/41/-4/0.11/145/24          26 NNW AERO 23 N   RMY 26
11/08 3/34/39/-5/0.08/295/49           26 N   AERO 23 N   RMY 27
11/09 50/31/41/-3/0.01/480/80          25 S   AERO 23 S   RMY N/A
11/10 45/20/33/-11/0.00/586/98         46 WNW AER0 44 WNW RMY 46
11/11 36/18/27/-16/0.00/589/99         28 WNW AERO 26 WNW RMY 28
11/12 44/27/36/-7/0.00/302/51          13 E   AERO  9 S   RMY 14
11/13 40/35/38/-5/0.26/000/00          20 NNW AERO 17 NNW RMY 20
11/14 40/33/37/-5/T/000/00             18 N   AERO 15 N   RMY 18
11/15 43/31/37/-5/0.00/417/71          20 NE  AERO 15 NE  RMY N/A
11/16 51/37/44/+2/0.21/012/02          32 SE  AERO 32 SE  RMY N/A TSTM
11/17 42/30/36/-5/0.00/565/97          41 WNW AERO 43 WNW RMY 47
11/18 49/26/38/-3/0.08/168/29          35 SSW AERO 35 SSW RMY 39
11/19 58/34/46/+5/0.36/231/40          50 W   AERO 50 W   RMY 54
11/20 39/31/35/-5/0.00/462/80          48 WNW AERO 50 WNW RMY 44
11/21 57/35/46/+6/0.00/506/88          46 SSW AERO 46 SSW RMY 48
11/22 53/35/44/+4/0.87/000/00          37 NW  AERO 38 NW  RMY 41
11/23 40/26/33/-6/0.00/571/100         26 NW  AERO 25 NW  RMY N/A
11/24 49/29/39/0/0.00/558/98           28 SSW AERO 26 SSW RMY 29
11/25 57/38/48/+9/0.00/523/92          29 SSW AERO 28 SSW RMY 31
11/26 46/33/40/+2/0.00/509/90          39 WNW AERO 41 WNW RMY 41
11/27 44/24/34/-4/0.00/254/45          37 W   AERO 39 W   RMY 36
11/28 45/19/32/-6/0.00/557/99          35 S   AERO 37 S   RMY N/A
11/29 58/34/46/+9/0.00/370/66          46 W   AERO 47 W   RMY 46
11/30 43/26/37/-2/0.00/263/47          25 SSE AERO 25 NNW RMY 25

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

12/01 50/35/43/+6/0.04/…/..          28 NW  AERO 29 NW  RMY 30
12/02 42/29/36/0/0.00/…/..           20 NNW AERO 18 NNW RMY N/A
12/03 42/32/37/+1/0.00/…/..          14 N   AERO 10 N   RMY N/A

12/04 Low temp since midnight is 32F; normal low is now 28F

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

RECORDS FOR DECEMBER 4
HIGH 67 IN 1998
LOW -4 IN 1940
PRECIP 1.87 INS. IN 1968
SNOWFALL 6.0 INS. IN 1907
PEAK GUST 73 MPH WNW IN 1980

RECORDS FOR DECEMBER 5
HIGH 65 IN 2001
LOW -1 IN 1926
PRECIP 2.86 INS. IN 1993
SNOWFALL 7.0 INS. IN 1926, 1981
PEAK GUST 67 MPH WNW IN 1961, S IN 1973

TODAY’S REPORT PREPARED BY: Kaitlin Geagan

 

Category: Daily Discussions

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