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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, OCTOBER 26, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

A COOL AUTUMN DAY WITH EXCELLENT VISIBILITY
ATOP GREAT BLUE HILL....

Light northwesterly winds have persisted between the 7 A.M. 
and 1 P.M. observations. Visibility has remained excellent 
at 85 miles throughout the day. Relative humidity has dropped 
from 73% at 7 A.M. to 37% at 1 P.M. The high temperature so 
far today is 44F, 13 below the normal of 57F. The low since 
midnight is 27F, 12 degrees below the daily normal minimum.
Temperatures measured today are normally observed in late 
November-early December! 
  

Today's Observations:

7 A.M.
Weather: Scattered altostratus, scattered cirrus 
Temperature: 30F; Dew Point: 23F; Wind: NW at 6 kts,
Wind: Light 
Sea-level pressure: 30.12 ins. Hg, rising, then more rapidly       
Visibility: 85 miles
6-hr Max temp: 30F
6-hr Min temp: 27F
24-hr Precip: 0.00 ins.   
BHO SA 1155 110 SCT 250 SCT 85 199/30/23/3006/012/ WND LGT/ 
8/022 53015 10030 20027

10 A.M.
Weather: Scattered altocumulus, broken cirrocumulus,
distant cumulus offshore
Temperature: 38F; Dew Point: 20F; Wind: NW at 8G13 kts 
Sea-level pressure: 30.16 ins. Hg, rising steadily 
Visibility: 85 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 120 SCT E250 BKN 85 212/38/20/3008G13/016/ 
CU DSNT OFFSHR/ 8/159 51013 

1 P.M.
Weather: Scattered cirrus
Temperature: 44F; Dew Point: 20F; Wind: W at 3 kts,
Wind: Light and variable
Sea-level pressure: 30.13 ins. Hg, falling steadily     
Visibility: 85 miles
6-hr Max temp: 44F
6-hr Min temp: 30F 
6-hr Precip: 0.00 ins.
BHO SA 1755 250 SCT 85 203/44/20/2803/013/ WND L/V/ 8/001 
58009 10044 20030 

SUMMARY FOR THURSDAY, OCTOBER 25, 2018 

TEMPERATURE (DEGREES F)
MAX.....48   NORMAL.....57
MIN.....32   NORMAL.....40
MEAN....40   NORMAL.....49

DEPARTURE FROM 30-YEAR NORMAL......................-9
TOTAL DEPARTURE FOR THE MONTH......................-3 [-0.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............25   DEPARTURE.........+8
TOTAL HEATING UNITS FOR THE MONTH.............323   DEPARTURE.........+7
TOTAL HEATING UNITS FOR THE SEASON............410   DEPARTURE........-48
TOTAL HEATING UNITS LAST SEASON TO DATE.......203   DIFFERENCE......+207

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0  DEPARTURE...........0
TOTAL COOLING UNITS FOR THE MONTH..............11  DEPARTURE..........+6
TOTAL COOLING UNITS FOR THE SEASON............874  DEPARTURE........+272
TOTAL COOLING UNITS LAST SEASON TO DATE.......727  DIFFERENCE.......+147

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................35 NW  AT   9:36 P.M.
                   AERO.........................35 NW  AT   9:34 P.M.
                   ASOS.........................36 NW  AT   9:37 P.M. 
                   DAVIS........................35 NW  AT   9:37 P.M. RMY 36
FASTEST MILE FOR YESTERDAY......................25 WNW AT  10:46 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................24 NW  AT   9:40 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................25 NW  AT   9:40 A.M.
AVERAGE WIND SPEED AND DIRECTION..............13.8 WNW
                   ASOS.......................13.3   
                   DAVIS......................13.9 WNW [307 deg.] 
**Davis malfunctioning  

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........3.35  DEPARTURE......-0.40
                         ASOS..............3.31 
TOTAL PRECIPITATION FOR THE YEAR..........50.53  DEPARTURE......+7.90
                         ASOS.............52.23 


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 65/53/59/+2/0.22/042/06         21 ENE AERO 18 SSW RMY N/A
10/02 64/53/59/+2/0.77/000/00         33 S   AERO 32 S   RMY 35 TSTM
10/03 60/52/56/0/0.33/000/00          18 NNE AERO 14 NNE RMY 14
10/04 69/57/63/+7/0.00/204/30         29 SSW AERO 29 SSW RMY 32
10/05 64/47/56/0/0.00/618/92          25 NE  AERO 21 NE  RMY 24
10/06 64/45/55/0/0.00/264/40          23 SSW AERO 23 SSW RMY 25
10/07 75/56/66/+11/0.05/072/11        28 NE  AERO 24 ENE RMY 27
10/08 56/53/55/+1/0.03/000/00         22 ENE AERO 20 ENE RMY N/A
10/09 75/56/66/+12/0.00/204/31        26 WSW AERO 28 SW  RMY 29
10/10 82/65/74/+20/0.00/480/73        24 WSW AERO 23 WSW RMY 25
10/11 70/56/63/+10/0.78/000/00        48 NNE AERO 47 NNE RMY 50
10/12 59/44/52/-1/0.31/174/27         32 NW  AERO 32 NW  RMY 33
10/13 49/40/45/-8/0.17/108/17         21 WNW AERO 20 WNW RMY 20
10/14 55/37/46/-6/0.00/120/19         21 W   AERO 18 W   RMY 21
10/15 66/44/55/+3/0.06/030/05         46 W   AERO 46 W   RMY N/A
10/16 56/41/49/-2/0.03/606/94         48 W   AERO 48 W   RMY N/A
10/17 60/39/50/-1/0.01/564/89         48 W   AERO 50 W   RMY 53
10/18 45/33/39/-12/..../.../..        32 WNW AERO 35 WNW RMY 36
10/19 60/31/46/-4/..../.../..         33 SSW AERO 36 SSW RMY 36
10/20 62/46/54/+4/..../.../..         35 SSW AERO 37 SSW RMY 33
10/21 46/31/39/-11/..../.../..        39 NNW AERO 41 NW  RMY 41
10/22 50/27/39/-10/..../.../..        24 W   AERO 22 W   RMY 21
10/23 53/40/47/-2/..../.../..         29 WNW AERO 29 WNW RMY 29 TSTM
10/24 45/35/40/-9/..../.../..         31 NW  AERO 31 NW  RMY 32 
10/25 48/32/40/-9/..../.../..         35 NW  AERO 35 NW  RMY 36

10/26 Low temp since midnight is 27F; normal low is 39F

DAILY RECORDS FOR OCTOBER

10/10/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 65F,
           BREAKS PREVIOUS RECORD OF 62F SET IN 1949

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

RECORDS FOR OCTOBER 26
HIGH 80F IN 1963
LOW 24F IN 1933
PRECIP 1.72 INCHES IN 1894
SNOW 3.0 INCHES IN 1962
WIND 59 MPH SSE IN 1967 

RECORDS FOR OCTOBER 27
HIGH 83F IN 1963
LOW 21F IN 1936
PRE 1.79 INCHES IN 1886
SNOW 2.5 INCHES IN 2011
WIND 54 MPH WNW IN 1968

TODAY'S REPORT PREPARED BY: Benjamin Turner