Wednesday, December 5, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, DECEMBER 5, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER WITH LIGHT AND VARIABLE WIND….

Visibility remained at 70 miles since this morning, with
mild obscuration from a thin smoke layer in the distance.
Wind remained light and northwesterly, with speeds at or
below 5 mph on average. There is partial freezing observed
on the surface of both Houghton’s Pond and Lake Ponkapoag.
Weather conditions remained fair today, with less than half
the sky being covered at any point in the observation period.
The high temperature so far today is 33F, 10 degrees below the
daily normal of 43F. The low since midnight is 18F, 9 degrees
above the normal minimum of 27F.

BHO Wettest Novembers, inches (1886-2018):

1) 10.32 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) 25.42 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: 10.32 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: Clear, few distant cumulus in all directions
Temperature: 20F; Dew Point: 11F; Wind: NNW at 9 kts
Sea-level pressure: 30.09 ins. Hg, rising then falling
Visibility: 70 miles
6-hr Max temp: 21F
6-hr Min temp: 18F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 CLR 70 190/20/11/3409/009/ FEW DSNT CU ALQDS/
8/100 50004 10021 20018

10 A.M.
Weather: Scattered cumulus
Temperature: 27F; Dew Point: 12F; Wind: NW at 3 kts,
Wind: Light and variable
Sea-level pressure: 30.13 ins. Hg, rising steadily
Visibility: 70 miles, thin smoke layer in all directions
3-hr Precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 50 SCT 70 204/27/12/3303/013/ THN K LYR ALQDS
WND L/V/ 8/100 51014

1 P.M.
Weather: Scattered altocumulus, few cumulus N-SSE
Temperature: 33F; Dew Point: 11F; Wind: NW at 3 knots,
Wind: Light and variable
Sea-level pressure: 30.05 ins. Hg, falling rapidly
Visibility: 70 miles
6-hr Max temp: 33F
6-hr Min temp: 19F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 250 SCT 70 176/33/11/3303/005/ FEW CU N-SSE WND
L/V/ 8/170 56028 10033 20019

SUMMARY FOR TUESDAY, DECEMBER 4, 2018

TEMPERATURE (DEGREES F)
MAX…..38   NORMAL…..43
MIN…..23   NORMAL…..28
MEAN….31   NORMAL…..35

DEPARTURE FROM 30-YEAR NORMAL……………………-4
TOTAL DEPARTURE FOR THE MONTH…………………..+12 [+2.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..34   DEPARTURE………+4
TOTAL HEATING UNITS FOR THE MONTH………….104   DEPARTURE……..-12
TOTAL HEATING UNITS FOR THE SEASON………..1424   DEPARTURE……..+46
TOTAL HEATING UNITS LAST SEASON TO DATE……1075   DIFFERENCE……+342

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..30 WNW AT  8:35 A.M.
AERO…………………….31 WNW AT  8:34 A.M.
ASOS…………………….33 NW  AT  8:36 A.M.
DAVIS……………………33 NW  AT  8:36 A.M. RMY 33
FASTEST MILE FOR YESTERDAY………………….21 WNW AT  8:36 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 NW  AT  4:45 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 NW  AT  8:37 A.M.
AVERAGE WIND SPEED AND DIRECTION……………13.4 NNW
ASOS……………………12.4
DAVIS…………………..13.5 NW [324 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…….+0.39
ASOS…………..0.80
TOTAL PRECIPITATION FOR THE YEAR……….64.41  DEPARTURE……+15.42
ASOS………….66.43

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……..-1.1
TOTAL SNOWFALL FOR THE SEASON……………7.6  DEPARTURE……..+3.9

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 Low temp since midnight is 18F; normal low is 28F

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

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

RECORDS FOR DECEMBER 6
HIGH 70 IN 2001
LOW 5 IN 1901,1935
PRECIP 2.78 INS. IN 2003
SNOWFALL 17.0 INS. IN 2003
PEAK GUST 74 MPH NW IN 1981

TODAY’S REPORT PREPARED BY: Benjamin Turner