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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, OCTOBER 19, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

SUNNY AND COOL WITH LIGHTER WINDS TODAY...

The sky has remained nearly completely clear today with
just a few low clouds far offshore and a few cirrus 
appearing later in the day. The visibility has been 
excellent near 85 miles all day due to the very dry
air with dew points in the 30's all day. 

The high so far today is 56F, 3 degrees below the daily
normal maximum of 59F. The low since midnight is 36F, 
6 degrees above the normal minimum of 42F. 

Today's Observations:

7 A.M.
Weather: Clear, few stratocumulus distant offshore
Temperature: 38F; Dew Point: 34F; Wind: WNW at 10 kts,
Sea-level pressure: 30.00 ins. Hg, steady then rising
Visibility: 85 miles
6-hr Max temp: 40F
6-hr Min temp: 36F
24-hour Precip.: 0.00 in. 
BHO SA 1155 CLR 85 160/38/34/2910/000/ FEW SC DSNT OFFSHR 
E-ESE/ 8/500 53008 10040 20036

10 A.M.
Weather: Clear, few stratocumulus distant offshore
Temperature: 50F; Dew Point: 33F; Wind: NW at 8 kts,
Sea-level pressure: 30.02 ins. Hg, rising then more slowly 
Visibility: 85 miles
3-hour Precip.: 0.00 in.
BHO SA 1455 CLR 85 167/50/33/3108/002/ FEW SC DSNT OFFSHR 
E-ESE/ 8/500 51007 

1 P.M.
Weather: Clear, few cumulus distant E-SE few cirrus SW-WSW
Temperature: 55F; Dew Point: 36F; Wind: W at 7 kts,
Sea-level pressure: 29.99 ins. Hg, falling then more quickly
Visibility: 85 miles
6-hr Max temp: 56F
6-hr Min temp: 38F 
BHO SA 1755 CLR 85 157/55/36/2807/999/ FEW CU DSNT E-ESE 
FEW CI SW-WSW/ 8/501 58010 10056 20038


SUMMARY FOR FRIDAY, OCTOBER 18, 2019 

TEMPERATURE (DEGREES F)
MAX.....57   NORMAL.....60
MIN.....41   NORMAL.....42
MEAN....49   NORMAL.....51

DEPARTURE FROM 30-YEAR NORMAL.....................-2
TOTAL DEPARTURE FOR THE MONTH.....................+3 [ 0.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............16  DEPARTURE.........+2
TOTAL HEATING UNITS FOR THE MONTH..............199  DEPARTURE.........-7
TOTAL HEATING UNITS FOR THE SEASON.............292  DEPARTURE........-56
TOTAL HEATING UNITS LAST SEASON TO DATE........260  DEPARTURE........+32

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY................0  DEPARTURE..........0
TOTAL COOLING UNITS FOR THE MONTH................2  DEPARTURE.........-3
TOTAL COOLING UNITS FOR THE SEASON.............682  DEPARTURE........+80
TOTAL COOLING UNITS LAST SEASON TO DATE........874  DEPARTURE.......-192

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................29 WNW AT 11:20 A.M. * 
                   AERO.........................32 W   AT  3:13 A.M. 
                   ASOS.........................31 NW  AT 11:25 A.M.
                   DAVIS........................32 W   AT 10:00 A.M. RMY 32
FASTEST MILE FOR YESTERDAY......................23 NW  AT 12:12 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE...................22 NW  AT 12:14 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................24 W   AT 10:02 A.M.
AVERAGE WIND SPEED AND DIRECTION..............14.3 WNW
                   ASOS.......................13.3  
                   DAVIS......................14.4 WNW [293 deg.]
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.16
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........4.62  DEPARTURE......+1.94
                         ASOS..............4.88
TOTAL PRECIPITATION FOR THE YEAR..........43.04  DEPARTURE......+1.27
                         ASOS.............43.11


PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

10/01  67/52/60/+3/0.06/.../..               28 SW  AERO 25 SSW RMY 29
10/02  74/49/62/+5/0.42/.../..               30 ENE AERO 25 ENE RMY 28
10/03  51/46/49/-7/..../.../..               28 ENE AERO 26 ENE RMY N/A
10/04  59/40/50/-6/..../.../..               38 NNW AERO 38 NNW RMY 38
10/05  58/35/47/-9/0.00/.../..               21 N   AERO 18 SSW RMY N/A
10/06  65/44/55/0/0.00/.../..                36 SSW AERO 35 SSW RMY N/A
10/07  77/57/67/+12/0.12/.../..              47 SSW AERO 46 SSW RMY 49
10/08  60/52/56/+2/T/.../..                  22 NE  AERO 18 NW  RMY N/A
10/09  55/49/52/-2/..../.../..               43 NE  AERO 37 NE  RMY 44
10/10  54/47/51/-3/..../.../..               41 NE  AERO 37 NE  RMY 42
10/11  52/48/50/-3/..../000/00               41 NE  AERO 39 NE  RMY 41
10/12  52/49/51/-2/..../.../..               39 NE  AERO 37 NE  RMY N/A
10/13  66/48/57/+4/..../.../..               18 WNW AERO 17 WNW RMY 18
10/14  67/51/59/+7/..../.../..               18 WSW AERO 17 WSW RMY N/A
10/15  61/43/52/0/..../.../..                18 NNW AERO 17 NNW RMY N/A
10/16  61/45/53/+2/..../.../..               58 ESE AERO 58 ESE RMY N/A
10/17  60/46/53/+2/..../.../..               61 E   AERO 63 E   RMY N/A
10/18  57/41/49/-2/..../.../..               29 WNW AERO 32 W   RMY 32

10/19 The low since midnight is 36F, normal daily minimum is 42F


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

RECORDS FOR OCTOBER 19
HIGH 81F IN 1945
LOW 21F IN 1922
PRECIP 3.64 INCHES IN 1932
SNOWFALL 1.0 INCHES IN 1972
PEAK GUST 66 MPH SSW IN 1967

RECORDS FOR OCTOBER 20
HIGH 78F IN 1965,1984
LOW 24F IN 1972
PRECIP 7.10 INCHES IN 1996 (RECORD FOR MONTH)
SNOWFALL TRACE IN 1934,1943
PEAK GUST 63 MPH W IN 1966

TODAY'S REPORT PREPARED BY: Mike Iacono