Saturday, December 8, 2018

| December 9, 2018 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, DECEMBER 8, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

COLD DAY WITH GOOD VISIBILITY ON TOP OF
GREAT BLUE HILL….

Persistent northwesterly wind has brought cool
temperatures to the top of Great Blue Hill, with
a high temperature so far of only 27F, where our
normal high daily temperature is 42F. Our low
since midnight is 15F, which is 11 degrees below
our normal low temperature for today. Visibility
has remained decent at 80 miles throughout the
day. Cloud cover has remained minimal, letting
lots of sunshine through on this cold winter day.

BHO Wettest Novembers, inches (1886-2018):

1) 10.31 in 2018
2) 9.78 in 1983
3) 9.29 in 1945
4) 9.17 in 1972
5) 8.95 in 1895
6) 8.93 in 1988
7) 8.79 in 1963

BHO Wettest Falls (Sep-Nov), inches (1886-2018):

1) 25.41 in 2018
2) 23.18 in 2005
3) 23.13 in 1996
4) 22.47 in 1888
5) 20.65 in 2011
6) 20.64 in 1932
7) 20.08 in 1962
PRELIMINARY STATS FOR NOVEMBER 2018

TEMPERATURE, Deg. F
Avg. Max. 45.2 [-4.8]
Avg. Min. 32.4 [-1.1]
Mean 38.8 [-2.9]
24-hour corrected mean: 38.6
Max. for month: 65F on the 1st and 2nd
Min. for month: 9F on the 22nd and 23rd

HEATING DEGREE DAYS
Total heating units: 776 [+78]
Total for the season: 1320 [+351]
Total for last season: 969

PRECIPITATION, Inches
Total: 10.31 in. [+5.56]
Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: 7.6 in. [+5.3]
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: N/A
Avg. corrected wind speed: N/A
Prevailing wind direction: N/A
Peak gust and direction: N/A

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus
Temperature: 15F; Dew Point: 6F; Wind: NW at 5 kts
Sea-level pressure: 30.40 ins. Hg, falling then rising
Visibility: 80 miles
6-hr Max temp: 19F
6-hr Min temp: 15F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 150 SCT 80 293/15/6/3205/040/ 8/060 55000 10019
20015

10 A.M.
Weather: Clear, few stratocumulus SW-NE, few altocumulus
in all directions, few cirrus E-W
Temperature: 21F; Dew Point: 10F; Wind: WNW at 10G14 kts
Sea-level pressure: 30.44 ins. Hg, rising, then more slowly
Visibility: 80 miles
3-hr Precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 CLR 80 307/21/10/3010G14/044/ FEW SC SW-NE FEW AC
ALQDS FEW CI E-W/ 8/474 51014

1 P.M.
Weather: Clear, few cumulus
Temperature: 26F; Dew Point: 9F; Wind: WNW at 9G16 kts
Sea-level pressure: 30.39 ins. Hg, falling steadily
Visibility: 80 miles
6-hr Max temp: 27F
6-hr Min temp: 15F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 CLR 80 290/26/9/3009G16/039/ FEW CU ALQDS/
56017 10027 20015

SUMMARY FOR FRIDAY, DECEMBER 7, 2018

TEMPERATURE (DEGREES F)
MAX…..37   NORMAL…..42
MIN…..21   NORMAL…..27
MEAN….29   NORMAL…..34

DEPARTURE FROM 30-YEAR NORMAL……………………-5
TOTAL DEPARTURE FOR THE MONTH……………………-6 [-1.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..36   DEPARTURE………+5
TOTAL HEATING UNITS FOR THE MONTH………….213   DEPARTURE……….6
TOTAL HEATING UNITS FOR THE SEASON………..1533   DEPARTURE……..+64
TOTAL HEATING UNITS LAST SEASON TO DATE……1143   DIFFERENCE……+390

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..29 NW  AT 11:34 A.M.
AERO…………………….29 NW  AT  2:09 P.M.
ASOS…………………….31 W   AT 11:35 A.M.
DAVIS……………………31 W   AT 11:34 A.M. RMY 32
FASTEST MILE FOR YESTERDAY………………….23 NW  AT 12:49 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 W   AT 12:55 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 WNW AT 12:54 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..13.1 NW
ASOS…………………..12.7
DAVIS………………….13.6 WNW [290 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.17
ASOS…………..0.97
TOTAL PRECIPITATION FOR THE MONTH……….1.04  DEPARTURE…….-0.11
ASOS…………..1.78
TOTAL PRECIPITATION FOR THE YEAR……….64.41  DEPARTURE……+14.92
ASOS………….67.41

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.4
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE……..-2.1
TOTAL SNOWFALL FOR THE SEASON……………7.6  DEPARTURE……..+2.9

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 65/49/57/+11/…./006/01         25 SSW AERO 24 SSW RMY N/A
11/02 65/52/59/+13/…./000/00         37 SSW AERO 41 SSW RMY N/A
11/03 64/42/53/+7/…./148/24          59 W   AERO 60 W   RMY 58
11/04 52/37/45/0/…./588/96           31 W   AERO 30 W   RMY N/A
11/05 49/40/45/0/…./000/00           30 ENE AERO 29 ENE RMY 28
11/06 58/45/52/+7/…./000/00          29 SSW AERO 29 SSW RMY 31
11/07 60/50/55/+10/…./593/98         30 WSW AERO 30 WSW RMY 32
11/08 52/37/45/+1/…./470/78          29 WNW AERO 26 WNW RMY 23
11/09 48/34/41/-3/…./240/40          43 E   AERO 40 E   RMY 42
11/10 45/32/39/-5/…./000/00          45 W   AERO 47 WNW RMY 46
11/11 43/30/37/-6/0.00/596/100         32 WNW AERO 30 W   RMY 32
11/12 48/27/38/-5/0.00/475/80          18 SW  AERO 18 SW  RMY N/A
11/13 52/37/45/+2/…./000/00          44 WNW AERO 44 WNW RMY 48
11/14 37/20/29/-13/…./471/80         45 WNW AERO 50 WNW RMY 50
11/15 30/19/25/-17/…./000/00         33 E   AERO 36 E   RMY N/A
11/16 41/30/36/-6/…./000/00          43 E   AERO 44 ENE RMY N/A
11/17 45/34/40/-1/0.00/111/19          28 W   AERO 27 W   RMY 28
11/18 40/30/35/-6/0.00/157/27          21 W   AERO 21 W   RMY M
11/19 38/33/36/-5/…./000/00          16 E   AERO 14 E   RMY N/A
11/20 38/31/35/-5/…./000/00          30 NE  AERO 30 NE  RMY N/A
11/21 39/20/30/-10/…./081/14         40 WNW AERO 46 WNW RMY 47
11/22 20/09/15/-25/…./567/99         36 NW  AERO 41 NW  RMY 42
11/23 30/09/20/-19/0.00/548/96         25 SW  AERO 25 SW  RMY 27
11/24 43/24/34/-5/…./302/53          27 SW  AERO 27 ESE RMY N/A
11/25 43/40/42/+3/…./000/00          39 ENE AERO 39 ENE RMY 39
11/26 44/39/42/+4/…./000/00          45 E   AERO 44 E   RMY 45
11/27 45/33/39/+1/…./141/25          44 ENE AERO 44 ENE RMY N/A
11/28 39/31/35/-3/…./180/32          37 WNW AERO 41 WNW RMY 42
11/29 43/30/37/0/…./315/56           40 NW  AERO 41 NW  RMY 44
11/30 39/27/33/-4/0.00/370/66          18 NW  AERO 16 NW  RMY N/A

DAILY RECORDS FOR NOVEMBER 2017

11/22/18: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 20F,
BREAKS PREVIOUS RECORD OF 26F SET IN 1972 AND 2008
11/22/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF 9F,
BREAKS PREVIOUS RECORD OF 12F SET IN 1987
11/23/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF 9F,
TIES PREVIOUS RECORD OF 9F SET IN 1888

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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

12/01 41/28/35/-2/0.00/…/..          20 NNW AERO 18 NNW RMY N/A
12/02 52/35/44/+8/1.04/…/..          28 ESE AERO 25 ESE RMY 27
12/03 54/38/46/+10/0.00/…/..         35 W   AERO 35 W   RMY 38
12/04 38/23/31/-4/0.00/…/..          30 WNW AERO 31 WNW RMY 33
12/05 33/18/26/-9/0.00/…/..          16 NNW AERO 15 NNW RMY N/A
12/06 37/24/31/-4/0.00/…/..          29 W   AERO 28 W   RMY 30
12/07 37/21/29/-5/0.00/…/..          29 NW  AERO 29 NW  RMY 32

12/08 Low temp since midnight is 15F; normal low is 26F

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

RECORDS FOR DECEMBER 8
HIGH 62 IN 1966
LOW -4 IN 1906
PRECIP 1.54 INS. IN 1969
SNOWFALL 2.5 INS. IN 2001
PEAK GUST 78e W IN 1979

RECORDS FOR DECEMBER 9
HIGH 68 IN 1966
LOW -14 IN 1902
PRECIP 3.23 INS. IN 2014
SNOWFALL 10.8 INS. IN 2005
PEAK GUST 66 SE IN 1973

TODAY’S REPORT PREPARED BY: Samantha Richard

 

Category: Daily Discussions

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