Sunday, December 9, 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
SUNDAY, DECEMBER 9, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

COLD DAY WITH WESTERLY WINDS….

Today has been cold, with a high temperature so far
of only 33F, which is 8 degrees cooler than our
normal daily high of 41F. Our low since midnight
was 17F, which is 9 degrees below our normal minimum
of 26F. Pressure has been decreasing slightly through-
out the afternoon, bringing an increase in cloud cover
to the area. Winds shifted to the west overnight, and
a smoke layer could be seen along the horizon earlier
today.

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 stratus, scattered altocumulus
Temperature: 19F; Dew Point: 15F; Wind: WSW at 8 kts
Sea-level pressure: 30.40 ins. Hg, falling unsteadily
Visibility: 70 miles
6-hr Max temp: 19F
6-hr Min temp: 17F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 25 SCT 100 SCT 70 295/19/15/2508/040/ DSNT
HZ ALQS/ 8/480 57004 10019 20017

10 A.M.
Weather: Scattered cirrus, few cumulus all quadrants,
think smoke layer along horizon SW-E
Temperature: 25F; Dew Point: 18F; Wind: WSW at 7 kts
Sea-level pressure: 30.38 ins. Hg, falling, then more quickly
Visibility: 70 miles, thin smoke layer
3-hr Precip: 0.00 ins.
BHO SA 1455 200 SCT 70 289/25/18/2507/038/ FEW CU ALQDS THN K
LYR ALG HRZN SW-E/ 8/101 58006

1 P.M.
Weather: Scattered stratocumulus, scattered cirrus
Temperature: 33F; Dew Point: 10F; Wind: WSW at 8 kts
Sea-level pressure: 30.28 ins. Hg, falling then more slowly
Visibility: 50 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 30 SCT 200 SCT 50 255/33/10/2508/028/ 8/402
56034 10033 20019

SUMMARY FOR SATURDAY, DECEMBER 8, 2018

TEMPERATURE (DEGREES F)
MAX…..27   NORMAL…..42
MIN…..15   NORMAL…..26
MEAN….21   NORMAL…..34

DEPARTURE FROM 30-YEAR NORMAL…………………..-13
TOTAL DEPARTURE FOR THE MONTH…………………..-19 [-2.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..44   DEPARTURE……..+13
TOTAL HEATING UNITS FOR THE MONTH………….257   DEPARTURE………19
TOTAL HEATING UNITS FOR THE SEASON………..1577   DEPARTURE……..+78
TOTAL HEATING UNITS LAST SEASON TO DATE……1175   DIFFERENCE……+402

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..28 NW  AT 1:53 P.M.
AERO…………………….27 NW  AT 1:53 P.M.
ASOS…………………….28 WNW AT 1:54 P.M.
DAVIS……………………20 WNW AT 1:53 P.M. RMY 29
FASTEST MILE FOR YESTERDAY………………….21 NW  AT 1:56 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 WNW AT 1:54 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20 WNW AT 1:57 P.M.
AVERAGE WIND SPEED AND DIRECTION……………9.0 NW
ASOS……………………9.0
DAVIS…………………..9.4 NW [316 deg.]

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……….1.04  DEPARTURE…….-0.28
ASOS…………..1.78
TOTAL PRECIPITATION FOR THE YEAR……….64.41  DEPARTURE……+14.75
ASOS………….67.41

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……..-2.4
TOTAL SNOWFALL FOR THE SEASON……………7.6  DEPARTURE……..+2.6

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 27/15/21/-13/0.00/…/..         28 NW  AERO 27 NW  RMY 29

12/09 Low temp since midnight is 17F; normal low is 26F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and

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

RECORDS FOR DECEMBER 10
HIGH 62 IN 1946
LOW -6 IN 1902
PRECIP 1.67 INS. IN 1907
SNOWFALL 6.0 INS. IN 1905
PEAK GUST 66e SW IN 1940

TODAY’S REPORT PREPARED BY: Samantha Richard

 

Category: Daily Discussions

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