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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JANUARY 21, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FRIGID WINDY DAY WITH GUSTY WIND FROM THE NORTHWEST
AND MODERATELY LOW VISIBILITY...

Today started at a cold -2F, which is 19 degrees below our
normal daily minimum of 17F. Icy conditions persist outside
due to these freezing temperatures we are experiencing and
rain that fell yesterday. As the day progresses, temperatures
remain around 0F, with a high temperature so far today of 2F.
Wind has been gusting over 20 knots all day today from the 
northwest, bringing in these freezing temperatures. Visibility
has remained at about 20 miles since mid morning due to a haze
in the area. The wind chill has been as low as -20F today. 
  

Today's Observations:

7 A.M.
Weather: Scattered altocumulus, distant haze in all directions
Temperature: -2F; Dew Point: -8F; Wind: NW at 14G22 kts
Sea-level pressure: 29.66 ins. Hg, increasing, then more quickly
Visibility: 40 miles
6-hr Max temp:  3F
6-hr Min temp: -2F
24-hr Precip: 0.89 in.
24-hr snowfall: 0.0
Snow depth: 3 ins. 
BHO SA 1155 60 SCT 40 043/-2/-8/3114G22/966/ DSNT HZ ALQDS
WND CHILL -20F/ 8/080 70089 53027 10003 21002

10 A.M.
Weather: Broken stratus, haze
Temperature: 0F; Dew Point: -4F; Wind: WNW at 12 kts
Sea-level pressure: 29.66 ins. Hg, falling, rising, then more quickly
Visibility: 20 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E30 BKN 20 075/0/-4/3012/966/ HAZE WND CHILL -18F
/ 8/600 53032

1 P.M.
Weather: Broken altostratus, few cumulus in all directions, haze
Temperature: 2F; Dew Point: -1F; Wind: WNW at 16G20 kts,
Sea-level pressure: 29.75 ins. Hg, rising then falling
Visibility: 20 miles
6-hr Max temp:  2F
6-hr Min temp: -2F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.00 ins.  
Snow depth: 3 ins.
BHO SA 1755 E66 BKN 20 076/2/-1/3016G20/975/ FEW CU ALQDS HAZE
WND CHILL -17F/ 8/110 51001 10002 21002

SUMMARY FOR SUNDAY, JANUARY 20, 2019 

TEMPERATURE (DEGREES F)
MAX.....33   NORMAL.....33
MIN......3   NORMAL.....17
MEAN....18   NORMAL.....25

DEPARTURE FROM 30-YEAR NORMAL........................-7
TOTAL DEPARTURE FOR THE MONTH.......................+47 [+2.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............47   DEPARTURE.........-7
TOTAL HEATING UNITS FOR THE MONTH.............742   DEPARTURE........-46
TOTAL HEATING UNITS FOR THE SEASON...........3038   DEPARTURE........-55
TOTAL HEATING UNITS LAST SEASON TO DATE......2962   DIFFERENCE.......+76

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................39 ENE AT 4:40 A.M.
                   AERO.........................43 ENE AT 4:40 A.M.
                   ASOS.........................47 ENE AT 4:43 A.M. 
                   DAVIS........................42 ENE AT 3:47 A.M. RMY 39
FASTEST MILE FOR YESTERDAY......................33 ENE AT 2:13 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................32 ENE AT 4:57 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................30 E   AT 2:15 A.M.
AVERAGE WIND SPEED AND DIRECTION..............16.8 NW
                   ASOS.......................19.2
                   DAVIS......................M [-- deg.]*

*Davis down due to ice buildup on instruments  

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.89  DEPARTURE.......+0.75
                         ASOS..............0.91
TOTAL PRECIPITATION FOR THE MONTH..........4.10  DEPARTURE.......+1.26
                         ASOS..............4.11
TOTAL PRECIPITATION FOR THE YEAR...........4.10  DEPARTURE.......+1.26
                         ASOS..............4.11

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.6
TOTAL SNOWFALL FOR THE MONTH................4.2  DEPARTURE........-7.0
TOTAL SNOWFALL FOR THE SEASON..............11.9  DEPARTURE.......-15.3


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 26/12/19/-6/0.00/0.0/.../..          36 WNW AERO 37 WNW RMY 38
01/12 26/9/18/-7/0.00/0.0/.../..           32 NW  AERO 32 NW  RMY 29
01/13 25/11/18/-7/0.00/0.0/.../..          18 NNW AERO 16 NW  RMY N/A
01/14 27/20/24/-1/0.00/0.0/.../..          20 NNE AERO 17 N   RMY N/A
01/15 34/18/26/1/0.00/0.0/.../..    22 NW  AERO 21 NNW RMY N/A
01/16 34/23/29/+4/0.00/0.0/.../..          33 W   AERO 32 W   RMY 35
01/17 27/13/20/-5/0.00/0.0/.../..          30 NNW AERO 28 NW  RMY N/A
01/18 40/21/31/+6/0.00/0.0/.../..          18 WNW AERO 18 WNW RMY N/A 
01/19 31/24/28/+3/.../1.6/.../..           30 E   AERO 30 E   RMY N/A
01/20 33/3/18/-7/.../.../.../..            39 ENE AERO 43 ENE RMY 39

01/21 Low temp since midnight is -2F; normal low is 17F


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

RECORDS FOR JANUARY 21
HIGH 65F IN 1906
LOW -4F IN 1888,1893
PRECIP 2.49 INS. IN 1979
SNOWFALL 9.0 INS. IN 2014
PEAK GUST 78e MPH SE IN 1979

RECORDS FOR JANUARY 22
HIGH 59F IN 1916
LOW -8F IN 1888,1976
PRECIP 1.24 INS. IN 1891,1987
SNOWFALL 10.0 INS. IN 2005
PEAK GUST 67 MPH W IN 1976

TODAY'S REPORT PREPARED BY: Samantha Richard