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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, DECEMBER 30, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

SNOW BEGINNING IN AFTERNOON AS COOL TEMPERATURES AND LIGHT 
WINDS CONTINUE...

Light snow began to fall at Great Blue Hill in the late morning, 
but so far only a trace has been measured. The current snow depth 
is at 2 ins. Temperatures are slightly warmer than yesterday, but 
are still very cold and well below normal. A minimum of 1F was 
measured this morning shortly before 7:00 A.M. EST, and the maximum 
so far for today is 14F. Yesterday, a high of 13F was reached in the 
afternoon, and with a minimum of -3F, the average came out to be 22F 
below normal. Winds are continuing to be lighter out of the W and WSW. 
A peak gust of 25 MPH out of the W was measured yesterday at 4:08 P.M., 
when winds were the strongest.


Today's Observations:

7 A.M.
Weather: Few stratocumulus along the horizon NNE-ESE, 
scattered altostratus, scattered cirrus
Temperature: 2F; Dew Point: -5F; Wind: W at 9G16 kts
Sea-level pressure: 30.12 ins. Hg, falling, then rising
Visibility: 60 miles
6-hr Max temp: 4F
6-hr Min temp: 1F
24-hr precip: 0.00 ins.
24-hr snowfall: 0.0 ins. 
Snow depth: 2 ins.
BHO SA 1155 150 SCT 250 SCT 60 199/2/M5/2709G16/012/ FEW 
SC DSNT ALG HRSN NNE-ESE/ 8/511 4/002 53006 10004 20001

10 A.M.
Weather: Few stratocumulus along the horizon NNE-E, overcast 
stratus, sun dimly visible
Temperature: 8F; Dew Point: -6F; Wind: W at 7 kts
Sea-level pressure: 30.11 ins. Hg, falling, then more quickly
Visibility: 30 miles
3-hr precip: 0.00 ins. 
BHO SA 1455 E060 OVC 30 197/8/M4/2707/011/ FEW SC DSNT ALG 
HRSN NNE-E SUN DMLY VSBL/ 8/6// 58002

1 P.M.
Weather: Light snow, overcast stratus, sun dimly visible
Temperature: 14F; Dew Point: 5F; Wind: WSW at 4 kts,
Wind speed: Light
Sea-level pressure: 30.01 ins. Hg, falling, then more slowly 
Visibility: 4 miles, distant fog in all directions
6-hr Max temp: 14F
6-hr Min temp: 1F
6-hr precip: Trace
6-hr snowfall: Trace
Snow depth: 2 ins.
BHO SA 1755 E040 OVC 4S- 161/14/5/2404/001/ NEW SNW PST 6 HRS 
TRACE SUN DMLY VSBL DSNT FG ALQDS WND LGT/ 8/6// 4/002 58036 
MANUAL 600// 10014 20002


SUMMARY FOR FRIDAY, DECEMBER 29, 2017

TEMPERATURE (DEGREES F)
MAX.....13   NORMAL.....35
MIN.....-3   NORMAL.....20
MEAN.....5   NORMAL.....27

DEPARTURE FROM 30-YEAR NORMAL..........................-22
TOTAL DEPARTURE FOR THE MONTH..........................-59 [-2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............60  DEPARTURE.........+22
TOTAL HEATING UNITS FOR THE MONTH...........1036  DEPARTURE.........+69
TOTAL HEATING UNITS FOR THE SEASON..........2005  DEPARTURE........-224
TOTAL HEATING UNITS LAST SEASON TO DATE.....1966  DIFFERENCE........+39

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................25 W AT 4:08 P.M. 
                   AERO........................25 W AT  6:14 P.M.
                   ASOS........................25 W AT 4:09 P.M. 
                   DAVIS.......................24 W AT 4:08 P.M. RMY 27
FASTEST MILE FOR YESTERDAY.....................19 W AT  4:10 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................18 WNW AT 4:09 P.M
MAXIMUM 2-MINUTE DAVIS AVERAGE.................19 WNW  AT 4:10 P.M.
AVERAGE WIND SPEED AND DIRECTION..............9.4 W   
                   ASOS.......................9.2  
                   DAVIS......................9.3 WNW [294 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.95  DEPARTURE......-1.66
                         ASOS..............3.20
TOTAL PRECIPITATION FOR THE YEAR..........52.79  DEPARTURE......-0.35
                         ASOS...............N/A **
** ASOS annual total not available due to erroneous readings

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.5
TOTAL SNOWFALL FOR THE MONTH................8.9  DEPARTURE.......-3.4
TOTAL SNOWFALL FOR THE SEASON...............8.9  DEPARTURE.......-6.0


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 50/35/43/+6/0.04/0.0/262/47         28 NW  AERO 29 NW  RMY 30
12/02 42/29/36/0/0.00/0.0/033/06          20 NNW AERO 18 NNW RMY N/A
12/03 42/32/37/+1/0.00/0.0/172/31         14 N   AERO 10 N   RMY N/A 
12/04 43/32/38/+3/0.00/0.0/522/94         16 E   AERO 14 E   RMY N/A 
12/05 58/34/46/+11/0.18/0.0/000/00        62 S   AERO 66 S   RMY 65
12/06 56/32/44/+9/0.54/0.0/160/29         52 S   AERO 55 S   RMY N/A
12/07 44/30/37/+3/0.00/0.0/540/98         25 WSW AERO 24 WSW RMY 25
12/08 38/28/33/-1/0.00/0.0/116/21         21 W   AERO 18 W   RMY 20
12/09 34/28/31/-3./0.70/.../000/00        23 NNW AERO 23 NNW RMY 23 
12/10 35/27/31/-2/0.02/.../384/70         30 W   AERO 30 W   RMY 27 
12/11 38/29/34/+1/0.00/0.0/301/55         23 W   AERO 21 W   RMY 22
12/12 43/31/37/+4/0.06/0.0/000/00         35 W   AERO 31 W   RMY N/A
12/13 31/18/25/-7/0.00/0.0/372/68         44 W   AERO 44 W   RMY 44
12/14 27/14/21/-11/T/T/257/47             35 WSW AERO 33 W   RMY 34 
12/15 24/12/18/-14/T/.../011/02           25 W   AERO 23 W   RMY N/A
12/16 32/17/25/-6/0.00/0.0/382/70         33 W   AERO 35 W   RMY 36
12/17 27/14/21/-10/0.00/0.0/425/78        21 NW  AERO 21 NW  RMY 20
12/18 35/20/28/-3/T/.../011/02            20 SSE AERO 16 SSE RMY 20
12/19 49/34/42/+12/T/.../185/34           36 WNW AERO 35 SW  RMY 38  
12/20 42/26/34/+4/T/.../.../..            41 W   AERO 40 W   RMY 45 
12/21 32/23/28/-2/0.00/0.0/.../..         26 NW  AERO 24 NW  RMY 27
12/22 32/21/27/-2/..../.../.../..         18 E   AERO 17 E   RMY N/A
12/23 36/24/30/+1/..../.../.../..         31 WSW AERO 28 WSW RMY 31
12/24 35/29/32/+3/..../.../.../..         30 ENE AERO 25 ENE RMY N/A
12/25 35/21/28/0/..../.../.../..           50 W   AERO 54 W   RMY 47
12/26 24/13/19/-9/0.00/0.0/..../..         39 W   AERO 39 W   RMY 41     
12/27 19/6/13/-15/0.00/0.0/..../..         28 WNW AERO 25 WNW RMY N/A
12/28 10/1/6/-22/0.00/0.0/..../..          37 WNW AERO 44 WNW RMY 43          
12/29 13/-3/5/-22/0.00/0.0/.../..          25 W   AERO 25 W   RMY 27

12/30 Low temp since midnight is 1F; normal low is now 19F


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

RECORDS FOR DECEMBER 30
HIGH 60 IN 1984
LOW -18 IN 1933
PRECIP 1.48 INS. IN 1891
SNOWFALL 7.5 INS. IN 1956
PEAK GUST 81 MPH WNW IN 1962

RECORDS FOR DECEMBER 31
HIGH 62 IN 1965
LOW -12 IN 1917
PRECIP 0.96 INS. IN 1906
SNOWFALL 7.5 INS. IN 2008
PEAK GUST 78 MPH NW IN 1990

TODAY'S REPORT PREPARED BY: Lizzy Suzedell