Friday, December 7, 2018

| December 7, 2018 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, DECEMBER 7, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER FAIR WEATHER LATE AUTUMN DAY ATOP
GREAT BLUE HILL….

Visibility was at 20 miles this morning, due a significant
haze. It has since increased to 75 miles at the 1 P.M.
observation. Wind from the west-northwest has picked up
since this morning, with a max gust of 29 mph occurring
shortly after noontime. Amidst sunny conditions and almost
clear skies, the temperature only increased a degree between
the 10 A.M. and the 1 P.M. observations. The high temperature
so far today is 37F, 5 degrees below the daily normal of 42F.
The low since midnight is 29F, 3 degrees above the normal
minimum of 27F.

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. [+5.55]
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: Clear, few distant cumulus
Temperature: 29F; Dew Point: 25F; Wind: W at 13G22 kts
Sea-level pressure: 30.14 ins. Hg, rising, then more rapidly
Visibility: 20 miles, hazy
6-hr Max temp: 32F
6-hr Min temp: 29F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 CLR 20 208/29/25/2713G22/014/ FEW DSNT
CU ALQDS HAZY/ 8/100 53020 10032 20029

10 A.M.
Weather: Clear, few distant cumulus
Temperature: 34F; Dew Point: 17F; Wind: NW at 12G22 kts
Sea-level pressure: 30.21 ins. Hg, rising steadily
Visibility: 70 miles
3-hr Precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 CLR 70 229/34/17/3112G22/021/ FEW DSNT CU
ALQDS/ 8/100 51021

1 P.M.
Weather: Clear, few cumulus
Temperature: 35F; Dew Point: 12F; Wind: WNW at 12G24 kts
Sea-level pressure: 30.20 ins. Hg, falling steadily
Visibility: 75 miles
6-hr Max temp: 37F
6-hr Min temp: 29F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 CLR 75 227/35/12/3012G24/020/ FEW CU
ALQDS/ 8/100 58002 10037 20029

SUMMARY FOR THURSDAY, DECEMBER 6, 2018

TEMPERATURE (DEGREES F)
MAX…..37   NORMAL…..42
MIN…..24   NORMAL…..27
MEAN….31   NORMAL…..35

DEPARTURE FROM 30-YEAR NORMAL……………………-4
TOTAL DEPARTURE FOR THE MONTH……………………-1 [+/-0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..34   DEPARTURE………+4
TOTAL HEATING UNITS FOR THE MONTH………….177   DEPARTURE……….0
TOTAL HEATING UNITS FOR THE SEASON………..1497   DEPARTURE……..+59
TOTAL HEATING UNITS LAST SEASON TO DATE……1115   DIFFERENCE……+382

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..29 NNW AT  1:47 P.M.
AERO…………………….28 W   AT 11:56 A.M.
ASOS…………………….29 W   AT 11:59 A.M.
DAVIS……………………30 W   AT 11:01 A.M. RMY 30
FASTEST MILE FOR YESTERDAY………………….24 W   AT  1:16 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 W   AT  1:19 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………25 W   AT  1:20 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..11.5 W
ASOS…………………..11.6
DAVIS………………….11.6 W [266 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.04  DEPARTURE…….+0.06
ASOS…………..0.81
TOTAL PRECIPITATION FOR THE YEAR……….64.40  DEPARTURE……+15.08
ASOS………….66.44

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……..-1.7
TOTAL SNOWFALL FOR THE SEASON……………7.6  DEPARTURE……..+3.3

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 Low temp since midnight is 29F; normal low is 27F

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

RECORDS FOR DECEMBER 7
HIGH 74 IN 1998
LOW 6 IN 1906
PRECIP 1.67 INS. IN 1953
SNOWFALL 6.3 INS. IN 2003
PEAK GUST 76e SE IN 1976

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

TODAY’S REPORT PREPARED BY: Benjamin Turner

 

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