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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JANUARY 30, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A COLDER THAN NORMAL WINTER DAY WITH GREAT
VISIBILITY IN THE AFTERNOON....

Winter precipitation overnight left a trace of 
snow on the ground, along with 0.20 inches 
in the rain gauge. Visibility increased
considerably throughout the day, becoming
80 miles at the 1 P.M. observation. Winds
remained westerly blowing at around 15 mph,
with a max gust of 30 mph. The high temperature 
so far today is 27F, 7 degrees below the daily 
normal of 34F. The low since midnight is 23F, 
which is 6 degrees above the daily normal 
minimum of 17F.      


Today's Observations:

7 A.M.
Weather: Broken stratocumulus
Temperature: 25F; Dew Point: 24F; Wind: WNW at 14G18 kts
Sea-level pressure: 29.73 ins. Hg, rising steadily
Visibility: 40 miles, distant fog
6-hr Max temp: 36F
6-hr Min temp: 25F
24-hr Precip: 0.20 ins.
24-hr snowfall: Trace
Snow depth: Trace 
BHO SA 1155 E60 BKN 40 069/25/24/2914G18/973/ DSNT FG ALQDS/ 8/400 
70020 51008 10036 20025

10 A.M.
Weather: Clear, few cumulus in all directions 
Temperature: 24F; Dew Point: 17F; Wind: W at 17G23 kts
Sea-level pressure: 29.79 ins. Hg, falling then rising
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 60 087/24/17/2717G23/979/ FEW CU ALQDS/ 8/100 53018 

1 P.M.
Weather: Clear, few cirrostratus E-SW
Temperature: 27F; Dew Point: 11F; Wind: W at 14G22 kts
Sea-level pressure: 29.76 ins. Hg, falling steadily
Visibility: 80 miles
6-hr Max temp: 27F
6-hr Min temp: 23F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins. 
Snow depth: Trace
BHO SA 1755 CLR 80 075/27/11/2614G22/976/ FEW CS E-SW/ 8/005 58012 
10027 20023 

SUMMARY FOR TUESDAY, JANUARY 29, 2019 

TEMPERATURE (DEGREES F)
MAX.....32   NORMAL.....34
MIN.....19   NORMAL.....17
MEAN....26   NORMAL.....25

DEPARTURE FROM 30-YEAR NORMAL........................+1
TOTAL DEPARTURE FOR THE MONTH.......................+53 [+1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............39   DEPARTURE.........-1
TOTAL HEATING UNITS FOR THE MONTH............1096   DEPARTURE........-51
TOTAL HEATING UNITS FOR THE SEASON...........3392   DEPARTURE........-60
TOTAL HEATING UNITS LAST SEASON TO DATE......3234   DIFFERENCE......+158

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................22 SE  AT  8:40 P.M.
                   AERO.........................21 SE  AT  8:08 P.M.
                   ASOS.........................22 ESE AT  8:11 P.M. 
                   DAVIS........................23 ESE AT  7:51 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY......................17 SSE AT 11:48 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................16 ESE AT  4:10 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................17 SE  AT  8:49 P.M.
AVERAGE WIND SPEED AND DIRECTION...............9.0 SE
                   ASOS........................9.8
                   DAVIS.......................9.5 E [346 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.20  DEPARTURE.......+0.06
                         ASOS..............0.19
TOTAL PRECIPITATION FOR THE MONTH..........5.30  DEPARTURE.......+1.22
                         ASOS..............5.44
TOTAL PRECIPITATION FOR THE YEAR...........5.30  DEPARTURE.......+1.22
                         ASOS..............5.44

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M........Trace  DEPARTURE........-0.6
TOTAL SNOWFALL FOR THE MONTH................4.2  DEPARTURE.......-11.9
TOTAL SNOWFALL FOR THE SEASON..............11.9  DEPARTURE.......-20.2

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/..../0.0/386/72         53 W   AERO 53 W   RMY 54
01/02 34/24/29/+2/..../.../432/81          22 NW  AERO 22 NW  RMY N/A
01/03 42/28/35/+9/0.01/T/228/43            28 WNW AERO 30 WNW RMY 30
01/04 43/30/37/+11/..../.../354/66         29 SW  AERO 29 SW  RMY 29
01/05 41/32/37/+11/1.19/000/000/00         26 NE  AERO 25 NNW RMY 27
01/06 42/21/32/+6/0.00/0.0/300/56          42 NW  AERO 46 NW  RMY 50
01/07 26/14/20/-6/.../.../474/88           37 NW  AERO 41 NW  RMY N/A
01/08 40/24/32/+6/.../.../000/00           24 SSE AERO 23 SSE RMY N/A
01/09 42/31/37/+11/.../.../084/16          44 W   AERO 46 WNW RMY 45
01/10 32/20/26/+1/T/T/090/17               37 NW  AERO 41 NW  RMY 43
01/11 26/12/19/-6/0.00/0.0/366/68          36 WNW AERO 37 WNW RMY 38
01/12 26/9/18/-7/0.00/0.0/486/89           32 NW  AERO 32 NW  RMY 29
01/13 25/11/18/-7/0.00/0.0/456/84          18 NNW AERO 16 NW  RMY N/A
01/14 27/20/24/-1/0.00/0.0/120/22          20 NNE AERO 17 N   RMY N/A
01/15 34/18/26/1/0.00/0.0/402/73           22 NW  AERO 21 NNW RMY N/A
01/16 34/23/29/+4/0.00/0.0/270/47          33 W   AERO 32 W   RMY 35
01/17 27/13/20/-5/0.00/0.0/480/87          30 NNW AERO 28 NW  RMY N/A
01/18 40/21/31/+6/0.00/0.0/156/28          18 WNW AERO 18 WNW RMY N/A 
01/19 31/24/28/+3/.../1.6/198/36           30 E   AERO 30 E   RMY N/A
01/20 33/3/18/-7/.../.../000/00            39 ENE AERO 43 ENE RMY 39
01/21 3/-2/1/-24/0.00/0.0/348/62           32*WNW AERO 41 WNW RMY M
01/22 24/0/12/-13/0.00/0.0/.../..          28 NW  AERO 30 NW  RMY 29
01/23 46/15/31/+6/0.00/0.0/.../..          37 SSW AERO 39 SSW RMY N/A
01/24 57/31/44/+19/1.44/0.0/.../..         77 S   AERO 79 S   RMY N/A
01/25 37/23/30/+5/0.00/0.0/.../..          41 WNW AERO 46 WNW RMY N/A
01/26 33/17/25/0/0.00/0.0/.../..           25 W   AERO 25 W   RMY 27        
01/27 44/24/34/+9/0.00/0.0/.../..          39 S   AERO 39 S   RMY 41
01/28 30/19/28/+3/..../.../.../..          28 NW  AERO 28 NW  RMY N/A
01/29 32/19/26/+1/..../.../.../..          22 SE  AERO 21 E   RMY N/A

01/30 Low temp since midnight is 25F; normal low is 17F

*Official gust chart reading low 

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

RECORDS FOR JANUARY 30
HIGH 60F IN 1914
LOW -8F IN 1948
PRECIP 1.12 INS. IN 1925
SNOWFALL 6.5 INS. IN 1986
PEAK GUST 76 MPH WNW IN 1962

RECORDS FOR JANUARY 31
HIGH 58F IN 1913, 1947, 2013
LOW -12F IN 1920
PRECIP 1.03 INS. IN 1914
SNOWFALL 9.0 INS. IN 1898
PEAK GUST 75 MPH NW IN 1974

TODAY'S REPORT PREPARED BY: Benjamin Turner