Friday, December 28, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, DECEMBER 28, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

WET FOGGY DAY WITH RISING TEMPERATURES….

Rain held off until just before the 7 A.M. observation, with only a trace
of precipitation measured at that time.  Since then, rain and drizzle have
endured throughout the day, along with yesterday’s clear skies yielding to
the advance of fog that has encompassed the blue hills since around 8 A.M..
Pressure has continued to fall throughout the day, with significant drops
observed in comparison to the relatively high pressure readings taken over
the past couple of days.  Winds have increased throughout the morning, with
strong southerly winds ushering in warm air that has already produced unseasonably
high temperatures.  Already, at the time of 1 P.M., a high temperature of
49 F has been produced.  Likewise, elevated gusts reached a maximum of 43 MPH
so far today.
Yesterday, despite modest northerly winds, the day went down in the books as
warmer than average, largely thanks to a high minimum temperature of 26 F.
With only a few days left in the December, the month is looking like it will
close out as a warm one, with a departure of +27 F at the time of this discussion.

Today’s Observations:

7 A.M.
Weather: Light Rain, overcast nimbostratus
Temperature: 34F; Dew Point: 32F; Wind: SSE at 13G24 kts
Sea-level pressure: 30.32 ins. Hg, falliing steadily
Visibility: 15 miles
6-hr Max temp: 34F
6-hr Min temp: 30F
24-hr Precip: TRACE
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E18 OVC 15R- 267/34/32/1613G24/032/ 8/02X/ 57039 10034 20030

10 A.M.
Weather: Light rain, fog
Temperature: 39F; Dew Point: 39F; Wind: SSE at 18G29 kts
Peak Wind: S 33 MPH (29 KTS) at 9:51 A.M.
Sea-level pressure: 30.23 ins. Hg, decreasing steadily, then more rapidly
Visibility: 1/8 mile
3-hr Precip: 0.05 ins.
BHO SA 1455 W2 X 1/8R-F 232/39/39/1618G29/023/ PK WND 1829/51/ 8//// 58035 6005/

1 P.M.
Weather: Light rain, light drizzle, fog
Temperature: 48F; Dew Point: 48F; Wind: S at 25G37 kts
Peak Wind: S 43 MPH (37 KTS) at 1:00 P.M.
Sea-level pressure: 30.02 ins. Hg, falling rapidly, then more slowly
Visibility: 1/8 mile
6-hr Max temp: 49F
6-hr Min temp: 34F
6-hr Precip: 0.08 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 W2 X 1/8R-L-F 166/48/48/1825G37/002/
PK WND 1837/60/ 8//// 6008/ 56066 10049 20034

SUMMARY FOR THURSDAY, DECEMBER 27, 2018

TEMPERATURE (DEGREES F)
MAX…..35   NORMAL…..36
MIN…..26   NORMAL…..20
MEAN….31   NORMAL…..28

DEPARTURE FROM 30-YEAR NORMAL……………………+3
TOTAL DEPARTURE FOR THE MONTH…………………..+27 [+0.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..34   DEPARTURE………-3
TOTAL HEATING UNITS FOR THE MONTH………….863   DEPARTURE……..-29
TOTAL HEATING UNITS FOR THE SEASON………..2183   DEPARTURE……..+29
TOTAL HEATING UNITS LAST SEASON TO DATE……1886   DIFFERENCE……+297

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..23 NW  AT  4:07 A.M.
AERO…………………….22 NW  AT  4:07 A.M.
ASOS…………………….24 NW  AT  4:12 A.M.
DAVIS……………………23 NW  AT  4:12 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….15 NNW AT  8:39 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 NW  AT  8:42 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………17 NW  AT  8:42 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.5 NNW
ASOS…………………..8.7
DAVIS………………….9.0  NW [315 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…TRACE  DEPARTURE…….-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.13  DEPARTURE…….-1.19
ASOS…………..3.78 *
TOTAL PRECIPITATION FOR THE YEAR……….66.50  DEPARTURE……+13.84
ASOS………….69.41 *
* ASOS MONTHLY AND ANNUAL PRECIPITATION IS SUSPECT

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.6
TOTAL SNOWFALL FOR THE MONTH…………….0.1  DEPARTURE…….-11.1
TOTAL SNOWFALL FOR THE SEASON……………7.7  DEPARTURE……..-6.1

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 41/28/35/-2/0.00/0.0/391/70          20 NNW AERO 18 NNW RMY N/A
12/02 52/35/44/+8/1.04/0.0/000/00          28 ESE AERO 25 ESE RMY 27
12/03 54/38/46/+10/0.00/0.0/178/32         35 W   AERO 35 W   RMY 38
12/04 38/23/31/-4/0.00/0.0/516/93          30 WNW AERO 31 WNW RMY 33
12/05 33/18/26/-9/0.00/0.0/432/78          16 NNW AERO 15 NNW RMY N/A
12/06 37/24/31/-4/0.00/0.0/354/64          29 W   AERO 28 W   RMY 30
12/07 37/21/29/-5/0.00/0.0/546/99          29 NW  AERO 29 NW  RMY 32
12/08 27/15/21/-13/0.00/0.0/518/94         28 NW  AERO 27 NW  RMY 29
12/09 34/17/26/-8/0.00/0.0/391/71          23 SSW AERO 21 SSW RMY 22
12/10 36/22/29/-4/0.00/0.0/544/99          24 NNW AERO 23 NNW RMY 22
12/11 36/17/27/-6/0.00/0.0/543/99          16 WSW AERO 14 WSW RMY N/A
12/12 35/18/27/-6/0.00/0.0/471/86          30 NW  AERO 29 NW  RMY M
12/13 31/16/24/-8/0.00/0.0/088/16          16 NNE AERO 12 SE  RMY N/A
12/14 46/28/37/+5/0.00/0.0/399/73          28 SSW AERO 28 SSW RMY 29
12/15 49/33/43/+11/0.04/0.0/000/00         28 NE  AERO 27 NE  RMY 30
12/16 40/37/39/+8/…./0.0/…/..          38 NE  AERO 38 NE  RMY 40
12/17 37/32/35/+4/…./0.0/…/..          39 NNE AERO 37 NNE RMY N/A
12/18 34/20/27/-4/0.02/0.1/…/..          48 NW  AERO 55 NW  RMY 48
12/19 38/17/28/-2/0.00/0.0/…/..          23 WNW AERO 23 WNW RMY N/A
12/20 47/30/39/+9/0.00/0.0/…/..         23 SW  AERO 22 SW  RMY N/A
12/21 62/43/53/+23/…./0.0/…/..         60 SSE AERO 62 SSE RMY 63
12/22 54/31/43/+14/…./0.0/…/..         41 W   AERO 45 W   RMY 43
12/23 38/27/33/+4/0.00/0.0/…/..          30 WNW AERO 32 WNW RMY N/A
12/24 34/27/31/+2/0.01/T/…/..            21 W   AERO 21 W   RMY N/A
12/25 35/23/29/+1/0.00/0.0/…/..          28 NW  AERO 28 NW  RMY 29
12/26 36/20/28/0/0.00/0.0/…/..           24 NW  AERO 24 NW  RMY 25
12/27 35/26/31/+3/0.00/0.0/…/..          23 NW  AERO 22 NW  RMY N/A

12/28 Low temp since midnight is 26F; normal low is 20F

DAILY RECORDS FOR DECEMBER 2018

12/21/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 62F,
BREAKS PREVIOUS RECORD OF 60F SET IN 1957

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

RECORDS FOR DECEMBER 28
HIGH 60 IN 1982
LOW -2 IN 1933
PRECIP 2.16 INS. IN 1967
SNOWFALL 9.5 INS. IN 1967
PEAK GUST 89 MPH SSE IN 1983

RECORDS FOR DECEMBER 29
HIGH 72 IN 1984
LOW -19 IN 1933 (RECORD FOR DECEMBER)
PRECIP 1.91 INS. IN 1945
SNOWFALL 18.4 INS. IN 1945
PEAK GUST 95 MPH S IN 1966 (RECORD FOR DECEMBER)

TODAY’S REPORT PREPARED BY: Nate Iannuccillo