Saturday, November 30, 2019

| December 1, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, NOVEMBER 30, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

BRIGHT AND SUNNY BUT COLDER AND BREEZY TODAY…

The sky has been nearly completely clear today with just
a few clouds passing during the day. The temperature has
been well below average after a morning low in the low
20’s and a high so far only in the middle 30’s. With dew
points dropping into the single digits, the relative
humidity has dropped to near 25 percent by early afternoon.
The wind continues breezy out of the NW with a peak gust
to 30 mph from the NW at 6:47 AM, which matched a gust
to the same speed earlier in the day. The visibility has
been excellent, climbing from 70 to 80 miles during
the day.

The high so far today is 35F, which is 10 degrees below the
daily normal maximum of 45F. The low since midnight is 23F,
which is six degree below the normal minimum of 29F.

The daily snowfall records for the next two days are
relatively low and may be surpassed in the upcoming storm.
The current records are:
December 1: 2.0 inches in 1902
December 2: 5.0 inches in 1894 and 1929

Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant offshore E-SE,
few altocumulus distant W, few cirrus S-W
Temperature: 23F; Dew Point: 10F; Wind: NW at 16G26,
Wind: Peak gust 26 knots, NW at 6:47 AM
Sea-level pressure: 29.97 ins. Hg, falling, then rising,
now higher
Visibility: 70 miles
6-hr Max temp: 26F
6-hr Min temp: 23F
24-hr Precip:  0.00 ins.
24-hr Snowfall: Trace.
BHO SA 1155 CLR 70 149/23/10/3116G26/997/ FEW SC DSNT
OFFSHR E-SE FEW AC DSNT W FEW CI S-W PK WND 3126/47/
8/131 53003 10026 20023

10 A.M.
Weather: Thin scattered cirrus
Temperature: 29F; Dew Point: 7F; Wind: NW at 14
Sea-level pressure: 29.97 ins. Hg, rising, then falling
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 –SCT 75 149/29/7/3214/997/ 8/001 55000

1 P.M.
Weather: Clear, few cirrus S-NNW, few lower dense cirrus SW-WSW
Temperature: 35F; Dew Point: 4F; Wind: NW at 13G22
Sea-level pressure: 29.92 ins. Hg, falling, then more quickly
Visibility: 80 miles
6-hr Max temp: 35F
6-hr Min temp: 23F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 80 131/35/4/3213G22/992/ FEW CI S-WNW
FEW LWR DNS CI SW-WSW/ 8/001 58018 10035 20023

SUMMARY FOR FRIDAY, NOVEMBER 29, 2019

TEMPERATURE (DEGREES F)
MAX…..39   NORMAL…..45
MIN…..27   NORMAL…..29
MEAN….33   NORMAL…..37

DEPARTURE FROM 30-YEAR NORMAL…………………-4
TOTAL DEPARTURE FOR THE MONTH………………..-92 [-3.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………32  DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE MONTH…………..761  DEPARTURE…….+91
TOTAL HEATING UNITS FOR THE SEASON…………1201  DEPARTURE…….-32
TOTAL HEATING UNITS LAST SEASON TO DATE…….1287  DEPARTURE…….-86

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..35  NW AT 12:50 A.M.
AERO…………………….36  NW AT  1:00 A.M. *
ASOS…………………….39  NW AT  6:14 P.M.
DAVIS……………………37  NW AT 12:40 A.M. RMY 39
FASTEST MILE FOR YESTERDAY………………….26  NW AT  6:14 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….25  NW AT  6:15 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………29  NW AT  6:13 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..16.5  NW
ASOS…………………..16.1
DAVIS………………….16.5  NW [322 deg.]
* Last of several occurrences

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……….3.74  DEPARTURE……-0.86
ASOS…………..3.93
TOTAL PRECIPITATION FOR THE YEAR……….49.08  DEPARTURE……+0.70
ASOS………….49.40

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.1
TOTAL SNOWFALL FOR THE MONTH…………….0.1  DEPARTURE…….-1.9
TOTAL SNOWFALL FOR THE SEASON……………0.1  DEPARTURE…….-2.2

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/…./0.0/534/86            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 The low since midnight is 23F, 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.

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

RECORDS FOR NOVEMBER 30
HIGH 67 IN 2006
LOW 7 IN 1887, 1929
PRECIP 2.42 INCHES IN 1944
SNOWFALL 10.2 INS IN 1945
PEAK GUST 90 SSW IN 1963

RECORDS FOR DECEMBER 1
HIGH 70 IN 2001
LOW 3 IN 1887
PRECIP 1.46 INS. IN 1917
SNOW 2.0 INS. IN 1902
PEAK GUST 72 MPH NW IN 1964

TODAY’S REPORT PREPARED BY: Mike Iacono

Category: Daily Discussions

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