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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JANUARY 11, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

CLEAR DAY SEES SEASONAL TEMPERATURES RETURN TO THE REGION...

After a warm start to the month of January the past day has 
witnessed the advent of cold northwesterly air in the region,
dropping temperatures back to seasonal readings.  Even so, after the 
the first ten days of the month, we currently sit at a +66 degree
cumulative departure from monthly averages (+6.4 degrees/day).  
Today's weather should help this departure drift back towards 
seasonal norms, with temperatures on track to stay below the 
climatological expectation.  At the time of the 1 P.M. observation, 
a high temperature of 26 F had been reached, well below the 
expected max of 34 F.  Rising pressure has seen clouds clear
from the Blue Hills, with relatively little cloud activity appearing 
directly overhead instead appearing mostly in the distance.  
Winds have decreased in magnitude since yesterday, but continue 
to sustain at significant speeds, continuing to drive in cold air from 
the west-Northwest. 

BHO Greatest Annual Precipitation, inches (1886-2018):

1) 71.00 in 1998
2) 69.36 in 1996
3) 67.20 in 2018
4) 66.23 in 2005
5) 65.51 in 1972

Today's Observations:

7 A.M.
Weather: Clear, Few distant altocumulus E-N-W, few distant cumulus S,
few distant stratocumulus SE-N
Temperature: 20F; Dew Point: 12F; Wind: WNW at 19G27 kts
Peak wind: 35 MPH (30 KTS) WNW at 6:43 A.M.
Sea-level pressure: 29.93 ins. Hg, increasing, then more rapidly     
Visibility: 50 miles
6-hr Max temp: 21F
6-hr Min temp: 19F
24-hr Precip: Trace
24-hr snowfall: Trace
Snow depth: 0 ins. 
BHO SA 1155 CLR 50 136/20/12/3019G27/993/ FEW DSNT AC E-N-W 
FEW DSNT CU S FEW DSNT SC SE-N PK WND 3030/43//  8/450/ 53025 
10021 20019

10 A.M.
Weather: Clear, Few distant cirrocumulus S, few distant altocumulus NE-N, 
few distant cumulus E, few distant stratocumulus W 
Temperature: 23F; Dew Point: 11F; Wind: WNW at 17G21 kts,
Sea-level pressure: 30.04 ins. Hg, rising steadily
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 70 174/23/11/3017G21/004/ FEW DSNT CC S FEW 
DSNT AC NE-N FEW DSNT CU E FEW DSNT SC W/ 8189/ 51038 

1 P.M.
Weather: Clear, Few cirrocumulus, few distant stratocumulus NW-NE  
Temperature: 26F; Dew Point: 11F; Wind: WNW at 18G25 kts,
Peak wind: 31 MPH (27 KTS) NW at 12:37 P.M
Sea-level pressure: 30.04 ins. Hg, falling steadily
Visibility: 75 miles
6-hr Max temp: 26F
6-hr Min temp: 19F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.  
Snow depth: 0 ins.
BHO SA 1755 CLR 75 173/26/11/3018G25/004/ FEW CC FEW DSNT 
SC NW-NE PK WND 3127/37// 8809/ 57001 10026 20019


SUMMARY FOR THURSDAY, JANUARY 10, 2019 

TEMPERATURE (DEGREES F)
MAX.....32   NORMAL.....34
MIN.....20   NORMAL.....17
MEAN....26   NORMAL.....25

DEPARTURE FROM 30-YEAR NORMAL........................+1
TOTAL DEPARTURE FOR THE MONTH.......................+66 [+6.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............39   DEPARTURE.........-1
TOTAL HEATING UNITS FOR THE MONTH.............323   DEPARTURE........-66
TOTAL HEATING UNITS FOR THE SEASON...........2619   DEPARTURE........-74
TOTAL HEATING UNITS LAST SEASON TO DATE......2617   DIFFERENCE........+2

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.....................37  NW  AT  7:20 P.M.
                   AERO..........................46  NW  AT  7:19 P.M.
                   ASOS..........................40  NW  AT  7:21 P.M. 
                   DAVIS.........................43  NW  AT  7:20 P.M. RMY 43
FASTEST MILE FOR YESTERDAY.......................30  NW  AT 10:40 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE....................26  NW  AT  2:18 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...................29  NW  AT 10:43 P.M.
AVERAGE WIND SPEED AND DIRECTION..............17.5 NW
                   ASOS.......................16.7
                   DAVIS......................17.6 NW [305 deg.]   

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...Trace  DEPARTURE.......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.14  DEPARTURE.......+0.72
                         ASOS..............2.14
TOTAL PRECIPITATION FOR THE YEAR...........2.14  DEPARTURE.......+0.72
                         ASOS..............2.14 

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M........Trace  DEPARTURE........-0.5
TOTAL SNOWFALL FOR THE MONTH................Trace   DEPARTURE........-5.6
TOTAL SNOWFALL FOR THE SEASON...................7.7  DEPARTURE.......-13.9

PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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

01/01 54/29/42/+15/..../0.0/.../..      53 W   AERO 53 W   RMY 54
01/02 34/24/29/+2/..../.../.../..          22 NW  AERO 22 NW  RMY N/A
01/03 42/28/35/+9/0.01/T/.../..        28 WNW AERO 30 WNW RMY 30
01/04 43/30/37/+11/..../.../.../..        29 SW  AERO 29 SW  RMY 29
01/05 41/32/37/+11/1.19/.../.../..     26 NE  AERO 25 NNW RMY 27
01/06 42/21/32/+6/0.00/0.0/.../..     42 NW  AERO 46 NW  RMY 50
01/07 26/14/20/-6/.../.../.../..         37 NW  AERO 41 NW  RMY N/A
01/08 40/24/32/+6/.../.../.../..           24 SSE AERO 23 SSE RMY N/A
01/09 42/31/37/+11/.../.../.../..         44 W   AERO 46 WNW RMY 45
01/10 32/20/26/+1/T/T/.../..             37 NW  AERO 41 NW  RMY 43
 
01/11 Low temp since midnight is 19F; normal low is 17F

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

RECORDS FOR JANUARY 11
HIGH 59F IN 1975
LOW -7F IN 1968
PRECIP 1.58 INS. IN 2008
SNOW 10.2 INS. 1927
PEAK GUST 95e MPH S IN 1980

RECORDS FOR JANUARY 12
HIGH 60F IN 2018
LOW -15F IN 1886
PRECIP 2.04 INS. IN 2011
SNOW 18.2 INS. IN 2011
WIND 84e MPH S IN 1980

TODAY'S REPORT PREPARED BY:  Nate Iannuccillo