Tuesday, January 1, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JANUARY 1, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM TEMPERATURES AND STRONG WINDS START OFF THE NEW YEAR…

This morning, an exceptionally high temperature of 54F was
recorded during the 10 A.M. observation.  While this value
approached the daily record high of 58F, reaching this looks
unlikely to happen, as winds shifting northwesterly this
morning have begun to shuttle in cold air from the north.
Despite clearing skies, elevated wind speeds continue to
enforce advective cooling throughout the region, with
temperatures slowly declining since the 10 A.M. observation.
So far today, peak gusts of up to 53 MPH have been recorded.
Pressure readings began the day with significantly low
readings in the wake of last night’s storm, with a station
pressure of 974.9 MB recorded at 7 A.M., with the
corresponding sea level pressure clocking in at 999.0 MB.
Since then, pressure has been on the rise, helping to
produce clear skies and excellent visibility for the
afternoon hours. Rainfall totaling 0.81 inches was recorded
at 7 A.M. this morning, ending 2018 and beginning 2019 with
a substantial precipitation event.

Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, scattered altocumulus
Temperature: 50F; Dew Point: 49F; Wind: WSW at 19G30 kts
Peak Wind: SW 37 MPH (32 KTS) at 6:08 A.M.
Sea-level pressure: 29.50 ins. Hg, falling quickly, then
more slowly
Visibility: 35 miles
6-hr Max temp: 50F
6-hr Min temp: 37F
24-hr Precip: 0.81 ins.
24-hr snowfall: Trace
Snow depth: 0 ins.
BHO SA 1155 E35 BKN 200 BKN 35 990/50/49/2419G30/950/
PK WND 2332/08// 857// 70081 56025 20050 10037

10 A.M.
Weather: Broken stratocumulus, scattered altocumulus
Temperature: 54F; Dew Point: 47F; Wind: W at 21G30 kts
Peak Wind: SW 35 MPH (30 KTS) at 9:02 A.M.
Sea-level pressure: 29.54 ins. Hg, increasing, then more
slowly
Visibility: 65 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E35 BKN 200 BKN 65 003/54/47/2721G30/954/
PK WND 2630/02// 857// 51013

1 P.M.
Weather: Few cumulus, few altocumulus
Temperature: 50F; Dew Point: 34F; Wind: WNW at 21G39 kts
Peak Wind: WNW 46 MPH (40 KTS) at 12:01 P.M.
Sea-level pressure: 29.65 ins. Hg, steady, then rising
more quickly
Visibility: 65 miles
6-hr Max temp: 54F
6-hr Min temp: 50F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 CLR 65 040/50/34/2921G39/965/ FEW CU FEW AC
PK WND 2940/01// 8150/ 53037 10054 20050

SUMMARY FOR MONDAY, DECEMBER 31, 2018

TEMPERATURE (DEGREES F)
MAX…..41   NORMAL…..35
MIN…..28   NORMAL…..19
MEAN….35   NORMAL…..27

DEPARTURE FROM 30-YEAR NORMAL……………………+8
TOTAL DEPARTURE FOR THE MONTH…………………..+66 [+1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..30   DEPARTURE………-8
TOTAL HEATING UNITS FOR THE MONTH………….976   DEPARTURE……..-67
TOTAL HEATING UNITS FOR THE SEASON………..2295   DEPARTURE……..-10
TOTAL HEATING UNITS LAST SEASON TO DATE……2122   DIFFERENCE……+173

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..33 SSE AT 10:47 P.M.
AERO…………………….32 SSE AT 10:46 P.M.
ASOS…………………….30 SSE AT 10:48 P.M.
DAVIS……………………35 SSE AT 10:45 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….25 SSE AT 10:40 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 SE  AT 10:48 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………26 SSE AT 10:48 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..12.3 SW
ASOS…………………..12.3
DAVIS………………….12.2 SSW [202 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.81  DEPARTURE…….+0.66
ASOS…………..0.79
TOTAL PRECIPITATION FOR THE MONTH……….3.55  DEPARTURE…….-1.34
ASOS…………..4.22 *
TOTAL PRECIPITATION FOR THE YEAR……….66.92  DEPARTURE……+13.69
ASOS………….69.85 *
* ASOS MONTHLY AND ANNUAL PRECIPITATION IS SUSPECT

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……..Trace  DEPARTURE……..-0.6
TOTAL SNOWFALL FOR THE MONTH…………….0.1  DEPARTURE…….-13.3
TOTAL SNOWFALL FOR THE SEASON……………7.7  DEPARTURE……..-8.3

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 54/30/42/+14/…./0.0/…/.. 44 SSW AERO M  M   RMY 47
12/29 54/30/42/+15/…./…/…/..         38 WNW AERO 38 WNW RMY 38
12/30 33/23/28/+1/0.00/0.0/…/..          24 NNW AERO 21 NNW RMY 17
12/31 41/28/35/+8/…./…/…/..          33 SSE AERO 32 SSE RMY N/A

01/01 Low temp since midnight is 35F; normal low is 19F

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 JANUARY 1
HIGH 58F IN 1966
LOW -6F IN 1918
PRECIP 1.45 INS. IN 1982
SNOWFALL 7.2 INS. IN 1938
PEAK GUST 90e MPH S IN 1945

RECORDS FOR JANUARY 2
HIGH 62F IN 1890
LOW -7F IN 1899,1918
PRECIP 2.10 INS. IN 1987
SNOWFALL 9.0 INS. IN 1904
PEAK GUST 85e MPH S IN 1942

TODAY’S REPORT PREPARED BY: Nate Iannuccillo