Tuesday, December 4, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, DECEMBER 4, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

A COOL AND DRY DAY WITH GOOD VISIBILITY ATOP GREAT
BLUE HILL….

Visibility rose since this morning, increasing from 70 miles
at 7 A.M. to 80 miles at 1 P.M. This is in conjunction with
drier air moving in from the northwest with an average wind
speed of 20 mph. Relative humidity dropped from 66% to 44%
during the observation period. The high temperature so far
today is 38F, 6 degrees below the daily normal of 44F. The low
since midnight is 30F, 2 degrees above the normal minimum of 28F.

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

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

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus
Temperature: 30F; Dew Point: 20F; Wind: NW at 15G22 kts
Sea-level pressure: 29.79 ins. Hg, rising steadily
Visibility: 70 miles
6-hr Max temp: 37F
6-hr Min temp: 30F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 100 SCT 70 087/30/20/3215G22/979/
8/070 51019 10037 20030

10 A.M.
Weather: Scattered cumulus
Temperature: 35F; Dew Point: 21F; Wind: NW at 15G22 kts
Sea-level pressure: 29.84 ins. Hg, rising steadily
Visibility: 75 miles
3-hr Precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 40 SCT 75 106/35/21/3215G22/984/ 8/100
51019

1 P.M.
Weather: Scattered cumulus
Temperature: 37F; Dew Point: 17F; Wind: NW at 15G22 knots
Sea-level pressure: 29.83 ins. Hg, falling slowly
Visibility: 80 miles
6-hr Max temp: 38F
6-hr Min temp: 30F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 40 SCT 80 103/37/17/3215G22/983/ 8/100
56003 10038 20030

SUMMARY FOR MONDAY, DECEMBER 3, 2018

TEMPERATURE (DEGREES F)
MAX…..54   NORMAL…..44
MIN…..38   NORMAL…..28
MEAN….46   NORMAL…..36

DEPARTURE FROM 30-YEAR NORMAL…………………..+10
TOTAL DEPARTURE FOR THE MONTH…………………..+16 [+5.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..19   DEPARTURE……..-10
TOTAL HEATING UNITS FOR THE MONTH…………..70   DEPARTURE……..-17
TOTAL HEATING UNITS FOR THE SEASON………..1390   DEPARTURE……..+42
TOTAL HEATING UNITS LAST SEASON TO DATE……1048   DIFFERENCE……+342

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..35 W   AT 12:40 P.M.
AERO…………………….35 W   AT 12:42 P.M.
ASOS…………………….35 W   AT 12:46 P.M.
DAVIS……………………37 WNW AT 12:44 P.M. RMY 38
FASTEST MILE FOR YESTERDAY………………….25 W   AT 12:46 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….25 W   AT 12:46 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………28 W   AT 12:46 P.M.
AVERAGE WIND SPEED AND DIRECTION……………13.6 W
ASOS……………………13.8
DAVIS…………………..13.8 W [274 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…….+0.56
ASOS…………..0.80
TOTAL PRECIPITATION FOR THE YEAR……….64.41  DEPARTURE……+15.59
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……..-0.8
TOTAL SNOWFALL FOR THE SEASON……………7.6  DEPARTURE……..+4.2

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 Low temp since midnight is 30F; normal low is 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: Benjamin Turner