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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JANUARY 22, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A MILDER DAY WITH EXCELLENT VISIBILITY FOLLOWING
RECORD-SETTING COLD....

We observed a perfect visibility of 90 miles at the 1 P.M.
observation. Weather conditions remained mostly clear, 
with some scattered cirrostratus being seen in the morning.
Winds persist from the northwest, though slightly lighter in 
relation to yesterday's wind. A new record low maximum 
temperature has been set yesterday, only reaching a high 
of 3F. This is 6 degrees less than the record of 9F set in 
1985, and it was the coldest daily maximum temperature in
January or any month since a high of 2F was observed on 
January 8, 1968. The high so far today is 20F, 13 degrees 
less than the daily normal of 33F. The low since midnight 
is 0F, 17 degrees under the normal minimum of 17F.  
  

Today's Observations:

7 A.M.
Weather: Clear, few distant cumulus offshore 
Temperature: 3F; Dew Point: -8F; Wind: NW at 15G21 kts
Sea-level pressure: 30.38 ins. Hg, rising rapidly
Visibility: 70 miles
6-hr Max temp:  3F
6-hr Min temp:  1F
24-hr Precip: 0.00 in.
24-hr snowfall: 0.0
Snow depth: 3 ins. 
BHO SA 1155 CLR 70 288/3/-8/3115G21/038/ FEW DSNT CU OFFSHR/ 
8/100 4/003 51053 10003 20001

10 A.M.
Weather: Clear, few distant cumulus offshore
Temperature: 12F; Dew Point: 1F; Wind: NW at 11G21 kts
Sea-level pressure: 30.48 ins. Hg, rising rapidly
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 80 321/12/1/3211G21/048/ FEW DSNT CU OFFSHR/ 
8/100 51033

1 P.M.
Weather: Scattered cirrostratus
Temperature: 20F; Dew Point: 5F; Wind: NW at 11G18 kts
Sea-level pressure: 30.47 ins. Hg, rising then falling
Visibility: 90 miles
6-hr Max temp: 20F
6-hr Min temp:  2F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.00 ins.  
Snow depth: 3 ins.
BHO SA 250 SCT 90 319/20/5/3211G18/047/ 8/008 4/003 58002 
10020 20002 

SUMMARY FOR MONDAY, JANUARY 21, 2019 

TEMPERATURE (DEGREES F)
MAX......3   NORMAL.....33
MIN.....-2   NORMAL.....17
MEAN.....1   NORMAL.....25

DEPARTURE FROM 30-YEAR NORMAL.......................-24
TOTAL DEPARTURE FOR THE MONTH.......................+23 [0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............64   DEPARTURE........+24
TOTAL HEATING UNITS FOR THE MONTH.............806   DEPARTURE........-22
TOTAL HEATING UNITS FOR THE SEASON...........3102   DEPARTURE........-31
TOTAL HEATING UNITS LAST SEASON TO DATE......2986   DIFFERENCE......+116

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................32 WNW AT 3:32 P.M.
                   AERO.........................41 WNW AT 3:32 P.M.
                   ASOS.........................45 W   AT 3:32 P.M. 
                   DAVIS........................MISSING
FASTEST MILE FOR YESTERDAY......................27 NW  AT 9:13 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................31 NW  AT 9:13 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................MISSING
AVERAGE WIND SPEED AND DIRECTION..............16.2 WNW
                   ASOS.......................19.9
                   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....0.00  DEPARTURE.......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........4.10  DEPARTURE.......+1.12
                         ASOS..............4.11
TOTAL PRECIPITATION FOR THE YEAR...........4.10  DEPARTURE.......+1.12
                         ASOS..............4.11

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.5
TOTAL SNOWFALL FOR THE MONTH................4.2  DEPARTURE........-7.5
TOTAL SNOWFALL FOR THE SEASON..............11.9  DEPARTURE.......-15.8


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 3/-2/1/-24/0.00/0.0/.../..           32*WNW AERO 41 WNW RMY M

01/22 Low temp since midnight is 0F; 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 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

RECORDS FOR JANUARY 23
HIGH 62F IN 1906
LOW -10F IN 1976
PRECIP 2.40 INS. IN 1935
SNOWFALL 14.6 INS. IN 1966
PEAK GUST 85 MPH S IN 1992

TODAY'S REPORT PREPARED BY: Benjamin Turner