Tuesday, December 3, 2019

| December 3, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, DECEMBER 3, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

CONSISTENT SNOW OVERNIGHT INTO TODAY,
CLEARING UP IN THE AFTERNOON….

Conditions have been snowy today, with it tapering
off around 3 P.M. Snowfall overnight totaled to 4.2
inches, with an additional 2.2 inches between 7 A.M.
and 1 P.M. Wind was moderate and northwesterly at
speeds around 20 mph. Visibility has been limited by
snow, but reached almost 80 miles to the west with
the storm moving away from the region in the afternoon.

Yesterday’s snowfall totaled 2.7 inches, still far
off from the current record.

Yesterday’s record is:
5.0 inches in 1894 and 1929

The high so far today is 30F, which is 14 degrees below the
daily normal maximum of 44F. The low since midnight is 25F,
which is 3 degrees below the normal minimum of 28F.

PRELIMINARY STATS FOR NOVEMBER 2019

TEMPERATURE, Deg. F
Avg. Max. 46.0 [-4.0]
Avg. Min. 30.3 [-3.2]
Mean      38.2 [-3.5]
24-hour corrected mean: 38.0
Max. for month: 67F on the 1st
Min. for month: 15F on the 13th

HEATING DEGREE DAYS
Total heating units:    761 [+99]
Total for the season:  1237 [-24]
Total for last season: 1319

PRECIPITATION, Inches
Total: 3.74 [-1.02]
Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: 0.1 [-2.2]
Greatest in 24 hrs: 0.1 ins. on the 12th

WIND, mph
Avg. uncorrected wind speed: 12.5 mph
Avg. corrected wind speed:   12.9 mph
Prevailing wind direction:   W [16%]
Peak gust and direction:     67 S on the 1st

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes:   N/A

Today’s Observations:

7 A.M.
Weather: Moderate snow
Temperature: 36F; Dew Point: 36F; Wind: NW at 12G20 kts
Sea-level pressure: 29.36 ins. Hg, falling steadily
Visibility: 1/2 mile
6-hr Max temp: 26F
6-hr Min temp: 25F
24-hr Precip:  1.12 ins.
24-hr Snowfall: 4.2 ins.
BHO SA 1155 X W3 1/2S 943/26/26/3312G20/936/ SCTD NEW
SNOW PAST 24 HRS 4.2 INS/ 8//// 4/007 70112 56008 10026
20025

10 A.M.
Weather: Moderate snow
Temperature: 27F; Dew Point: 27F; Wind: NW at 12G16 kts
Sea-level pressure: 29.33 ins. Hg, falling steadily
Visibility: 1/2 mile
3-hr Precip: 0.16 ins.
3-hr Snowfall: 1.5 ins.
BHO SA 1455 X W3 1/2S 935/27/27/3212G16/933/ SCTD NEW
SNOW PAST 3 HRS 1.5 INS/ 8//// 6016/ 58008

1 P.M.
Weather: Light snow
Temperature: 29F; Dew Point: 29F; Wind: WNW at 10G20 kts
Sea-level pressure: 29.27 ins. Hg, falling then rising
Visibility: 1 mile
6-hr Max temp: 30F
6-hr Min temp: 26F
6-hr Precip:  0.23 ins.
6-hr Snowfall: 2.2 ins.
BHO SA 1755 E65 OVC 1S 913/29/29/3010G20/927/ S-CTD NEW SNOW PAST
6 HRS 2.2 INS/ 8/02/ 4/009 6023/ 56022 10030 20026

SUMMARY FOR MONDAY, DECEMBER 2, 2019

TEMPERATURE (DEGREES F)
MAX…..37   NORMAL…..44
MIN…..25   NORMAL…..28
MEAN….31   NORMAL…..36

DEPARTURE FROM 30-YEAR NORMAL…………………-5
TOTAL DEPARTURE FOR THE MONTH…………………-18 [-9.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………34  DEPARTURE……..+5
TOTAL HEATING UNITS FOR THE MONTH……………75  DEPARTURE…….+17
TOTAL HEATING UNITS FOR THE SEASON…………1312  DEPARTURE……..-7
TOTAL HEATING UNITS LAST SEASON TO DATE…….1370  DEPARTURE…….-58

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..52 NE  AT 12:42 P.M.
AERO…………………….47 NE  AT 12:42 P.M.
ASOS…………………….51 NE  AT 12:42 P.M.
DAVIS……………………50 ENE AT 12:41 P.M. RMY 53
FASTEST MILE FOR YESTERDAY………………….34 NE  AT 12:53 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….30 NE  AT 12:56 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………34 NE  AT 12:54 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..22.2 ENE
ASOS…………………..21.3
DAVIS………………….21.4 NE [51 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.12  DEPARTURE……+0.96
ASOS…………..1.21
TOTAL PRECIPITATION FOR THE MONTH……….2.17  DEPARTURE……+1.85
ASOS…………..2.26
TOTAL PRECIPITATION FOR THE YEAR……….51.25  DEPARTURE……+2.39
ASOS………….51.66

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….4.2  DEPARTURE…….+3.9
TOTAL SNOWFALL FOR THE MONTH……………10.0  DEPARTURE…….+9.5
TOTAL SNOWFALL FOR THE SEASON…………..10.1  DEPARTURE…….+7.0

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
12/02  37/25/31/-5/…../2.7/…/..           52 NE  AERO 47 NE  RMY 53

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 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

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

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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