Monday, December 2, 2019

| December 2, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, DECEMBER 2, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

RAIN TURNING TO SNOW WITH A STRONG
EASTERLY WIND….

Conditions have been rainy today, with moderate snow
beginning in the afternoon following the 1 P.M.
observation. Snowfall yesterday night totaled to 5.8
inches, becoming rain shortly after midnight. Winds
have been strong and easterly, with a max gust exceeding
50 mph. Visibility has been incredibly limited by either
rain, snow, or fog, only reaching 1 mile at most. A trace
of snowfall was recorded between 10 and 11 P.M., when
the wind shifted northeasterly and brought temperatures
down by almost four degrees. The wind then shifted back
to the east, and the light snow turned back to rain.
Between 7 A.M. and 1 P.M., another 0.35 inches was
measured. Around 2 P.M., wind began to blow out of the
north-northeast, bringing with it a moderate, consistent
snowfall.

The daily snowfall record for today is
relatively low and may be surpassed in the
storm.

The current record is:
December 2: 5.0 inches in 1894 and 1929

With 5.7 inches falling yesterday, the record
of 2.0 inches in 1902 has been smashed!

The high so far today is 37F, which is 7 degrees below the
daily normal maximum of 44F. The low since midnight is 27F,
which is a degree below the normal minimum of 29F.

Today’s Observations:

7 A.M.
Weather: Light rain and fog
Temperature: 36F; Dew Point: 36F; Wind: ENE at 20G34 kts,
Peak wind: 44 MPH (38 kts) ENE at 6:08 A.M.
Sea-level pressure: 29.57 ins. Hg, steady
Visibility: 1 mile, fog
6-hr Max temp: 36F
6-hr Min temp: 33F
24-hr Precip:  1.05 ins.
24-hr Snowfall: 5.8 ins.
BHO SA 1155 E65 OVC 1R-F 015/36/36/0620G34/957/ R-CTD NEW
SNOW PAST 24 HRS 5.8 INS PK WND 0638/08/ 8/02/ 4/005 70105
54000 10036 20033

10 A.M.
Weather: Light rain and fog
Temperature: 37F; Dew Point: 37F; Wind: NE at 19G36 kts,
Peak Wind: 43 MPH (37 kts) NE at 9:03 A.M.
Sea-level pressure: 29.60 ins. Hg, rising, then falling
Visibility: 1/2 mile, fog
3-hr Precip: 0.15 ins.
BHO SA 1455 X W3 1/2R-F 023/37/37/0519G36/960/ R-CTD PK
WND 0537/03/ 8//// 6015/ 53008

1 P.M.
Weather: Light rain and fog
Temperature: 36F; Dew Point: 36F; Wind: NE at 22G45 kts,
Peak wind: 52 MPH (45 kts) NE at 12:42 P.M.
Sea-level pressure: 29.52 ins. Hg, falling, then more quickly
Visibility: 1 mile, fog
6-hr Max temp: 37F
6-hr Min temp: 36F
6-hr Precip: 0.35 ins.
6-hr Snowfall: Trace
BHO SA 1755 E65 OVC 1R-F 998/36/36/0522G45/952/ R-CTD NEW SNOW
PAST 6 HRS TRACE PK WND 0545/42/ 8/02/ 4/003 6035/ 58025 10037
20036

SUMMARY FOR SUNDAY, DECEMBER 1, 2019

TEMPERATURE (DEGREES F)
MAX…..32   NORMAL…..44
MIN…..16   NORMAL…..29
MEAN….24   NORMAL…..37

DEPARTURE FROM 30-YEAR NORMAL…………………-13
TOTAL DEPARTURE FOR THE MONTH…………………-13 [-13.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………41  DEPARTURE…….+13
TOTAL HEATING UNITS FOR THE MONTH……………41  DEPARTURE…….+12
TOTAL HEATING UNITS FOR THE SEASON…………1278  DEPARTURE…….-12
TOTAL HEATING UNITS LAST SEASON TO DATE…….1349  DEPARTURE…….-71

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..33 ENE AT 11:45 P.M.
AERO…………………….32 ENE AT 11:58 P.M.
ASOS…………………….36 ENE AT  9:44 P.M.
DAVIS……………………34 ENE AT  9:43 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….24 E   AT 10:08 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….24 ENE AT 11:20 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………24 E   AT 10:00 P.M.
AVERAGE WIND SPEED AND DIRECTION……………9.2 ENE
ASOS……………………9.4
DAVIS…………………..9.6 NE [50 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.05  DEPARTURE……+0.89
ASOS…………..1.05
TOTAL PRECIPITATION FOR THE MONTH……….1.05  DEPARTURE……+0.89
ASOS…………..1.05
TOTAL PRECIPITATION FOR THE YEAR……….50.13  DEPARTURE……+1.43
ASOS………….50.45

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….5.8  DEPARTURE…….+5.6
TOTAL SNOWFALL FOR THE MONTH…………….5.8  DEPARTURE…….+5.6
TOTAL SNOWFALL FOR THE SEASON……………5.8  DEPARTURE…….+3.1

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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  67/35/51/+5/0.12/0.0/534/86            67 S   AERO M  M   RMY N/A
11/02  50/31/41/-5/0.00/0.0/612/99            17 WNW AERO 14 W   RMY N/A
11/03  53/35/44/-2/0.00/0.0/567/92            25 WSW AERO 23 W   RMY 26
11/04  53/33/43/-2/0.00/0.0/546/89            24 S   AERO 20 S   RMY 24
11/05  54/44/49/+4/0.33/0.0/000/00            22 S   AERO 18 WNW RMY 28
11/06  51/36/44/-1/0.00/0.0/596/98            28 WSW AERO 23 W   RMY 27
11/07  55/38/47/+2/0.27/0.0/000/00            30 S   AERO 26 SSW RMY 32
11/08  38/23/31/-13/0.00/0.0/555/92           38 NW  AERO 37 WNW RMY 44
11/09  39/20/30/-14/0.00/0.0/583/97           22 S   AERO 18 S   RMY N/A
11/10  51/30/41/-3/0.00/0.0/174/29            30 SW  AERO 30 SW  RMY 31
11/11  52/39/46/+3/T/0.0/000/00               23 NE  AERO 22 NE  RMY 23
11/12  42/20/31/-12/0.08/0.1/000/00           37 WNW AERO 37 WNW RMY 41
11/13  28/15/22/-21/0.00/0.0/592/100          32 WNW AERO 32 WNW RMY 35
11/14  36/17/28/-14/0.00/0.0/136/23           18 SW  AERO 17 SW  RMY 20
11/15  51/32/42/0/0.00/0.0/553/94             25 WNW AERO 25 WNW RMY N/A
11/16  35/22/29/-13/0.00/0.0/580/99           35 NNW AERO 35 NNW RMY N/A
11/17  40/21/31/-10/T/T/…/..                28 ENE AERO 27 ENE RMY 29
11/18  36/32/34/-7/…./0.0/…/..            28 NNE AERO 29 N   RMY 31
11/19  42/36/39/-2/…./0.0/…/..            12 SSW AERO  9 NNW RMY N/A
11/20  38/33/36/-4/…./T/…/..              20 NW  AERO 18 NW  RMY 21
11/21  46/30/38/-2/0.00/0.0/…/..            21 NW  AERO 21 NW  RMY N/A
11/22  52/32/42/+2/0.12/0.0/…/..            46 W   AERO 47 W   RMY 47
11/23  44/27/36/-3/0.00/0.0/…/..            29 WNW AERO 29 WNW RMY N/A
11/24  44/35/40/+1/1.49/0.0/…/..            45 N   AERO 44 NE  RMY 46 TSTM
11/25  50/34/42/+3/0.00/0.0/…/..            32 WNW AERO 35 WNW RMY 23
11/26  59/39/49/+11/0.00/0.0/…/..           28 SSW AERO 27 SSW RMY 29
11/27  50/42/46/+8/…./0.0/…/..            30 W   AERO 32 W   RMY N/A TSTM
11/28  48/30/39/+1/…./T/…/..              42 NW  AERO 44 NW  RMY 44
11/29  39/27/33/-4/0.00/0.0/…/..            35 NW  AERO 36 NW  RMY 39
11/30  35/22/29/-8/0.00/0.0/…/..            30 NW  AERO 28 WNW RMY 31

12/01 The low since midnight is 16F, daily normal minimum is 29F

DAILY RECORDS FOR NOVEMBER

11/13/19: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 28F,
BREAKS PREVIOUS RECORD OF 30F SET IN 1920.
It was also the third earliest maximum temperature
colder than 30F on record, behind only 28F on 11/8/1894
and 29F on 11/12/1894.

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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  32/16/24/-13/…./5.8/…/..           33 ENE AERO 32 ENE RMY N/A

DAILY RECORDS FOR DECEMBER

12/01/19: DAILY RECORD SNOWFALL OF 5.7 INS.,
BREAKS PREVIOUS RECORD OF 2.0 INS. SET IN 1902.

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

RECORDS FOR DECEMBER 2
HIGH 61 IN 1998
LOW 3 IN 1890
PRECIP 2.09 INS. IN 1974
SNOWFALL 5.0 INS. IN 1894, 1929
PEAK GUST 89e MPH SSE IN 1942

RECORDS FOR DECEMBER 3
HIGH 67 IN 2009
LOW  -1 IN 1890
PRECIP 2.10 INS. IN 1986
SNOWFALL 6.0 INS. IN 1963
PEAK GUST 73e MPH W IN 1942

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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