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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, OCTOBER 13, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

CHILLY START TO A PLEASANT DAY ON TOP OF GREAT BLUE HILL

The day started with a temperatures inversion with temperatures
higher on top of Great Blue Hill than down in the valley.
We had an overnight minimum of 48F while neighboring Norwood
recorded an overnight low of 31F. We have also returned to
more seasonable conditions with a high of 63F by 1:00 PM EST.
The normal for this time of year is 61F. 

Winds have been mild coming from the East/ Southeast. Skies 
have remained mostly clear with scattered cumulus at each 
observation. We had patches of steam fog over the ponds this 
morning that quickly burned at after 7:00 AM EST. Visibility 
stayed consistent at 70 miles. 

Today's Observations:

7 A.M.
Weather: Scattered cumulus, patches of steam fog over ponds
ESE-SE
Temperature: 51F; Dew Point: 43F; Wind: E at 7 kts
Sea-level pressure: 30.52 ins. Hg, rising unsteadily 
Visibility: 70 miles
6-hr Max temp: 51F
6-hr Min temp: 48F
24-hr precip: 0.00 ins. 
BHO SA 1155 30 SCT 70 334/51/43/0907/052/ PTCHS STEAM FG OVR PNDS 
ESE-SE INVSN PRSNT ALQDS/ 8/100 52006 10051 20048

10 A.M.
Weather: Scattered cumulus
Temperature: 59F; Dew Point: 45F; Wind: E at 10 kts
Sea-level pressure: 30.51 ins. Hg, rising then falling
Visibility: 70 miles
BHO SA 1455 30 SCT 70 333/59/45/1010/051/ 8/100 51001 

1 P.M. 
Weather: Scattered cumulus 
Temperature: 63F; Dew Point: 47F; Wind: SE AT 7 kts
Sea-level pressure: 30.46 ins. Hg, falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 63F 
6-hr Min temp: 47F
BHO SA 1755 45 SCT 70 314/63/47/1307/046/ 8/100 58019 10063 20051

SUMMARY FOR THURSDAY, OCTOBER 12, 2017
 
TEMPERATURE (DEGREES F)
MAX.....58   NORMAL.....62
MIN.....48   NORMAL.....44
MEAN....53   NORMAL.....53

DEPARTURE FROM 30-YEAR NORMAL..........................0
TOTAL DEPARTURE FOR THE MONTH........................+97 [+7.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE...........0
TOTAL COOLING UNITS FOR THE MONTH..............20   DEPARTURE.........+16
TOTAL COOLING UNITS FOR THE SEASON............727   DEPARTURE........+126
TOTAL COOLING UNITS LAST SEASON TO DATE.......894   DEPARTURE........-167

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............12   DEPARTURE...........0
TOTAL HEATING UNITS FOR THE MONTH..............43   DEPARTURE.........-82
TOTAL HEATING UNITS FOR THE SEASON............136   DEPARTURE........-131
TOTAL HEATING UNITS LAST SEASON TO DATE.......180   DEPARTURE.........-44

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................30 NE  AT  8:25 A.M.
                   AERO........................28 NE  AT  7:43 A.M.
                   ASOS........................32 NE  AT  9:02 A.M.
                   DAVIS.......................30 ENE AT  7:45 A.M.   RMY 30
FASTEST MILE FOR YESTERDAY.....................23 ENE AT  9:29 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................22 ENE AT  7:47 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................21 ENE AT  7:47 A.M.
AVERAGE WIND SPEED AND DIRECTION.............13.0 NE
                   ASOS......................12.5
                   DAVIS.....................12.5 ENE [63 DEG.]


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..........0.45  DEPARTURE......-1.33
                         ASOS..............0.46
TOTAL PRECIPITATION FOR THE YEAR..........42.31  DEPARTURE......+1.45
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings


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

10/1  65/42/54/-3/0.00/697/99               18 WNW AERO 16 NW  RMY N/A
10/2  65/46/56/-1/0.00/687/98               21 NNW AERO 21 NNW RMY 21
10/3  67/50/59/+3/0.00/677/97               21 S   AERO 21 S   RMY N/A
10/4  75/50/63/+7/0.00/660/95               30 SSW AERO 30 SW  RMY 32
10/5  79/60/70/+14/0.00/.../..              28 SW  AERO 26 SW  RMY N/A
10/6  73/57/65/+10/T/.../..                 15 NW  AERO 14 NW  RMY 15
10/7  75/59/67/+12/T/.../..                 29 S   AERO 30 SSW RMY N/A
10/8  71/67/69/+15/0.23/.../..              33 S   AERO 36 SSW RMY 37
10/9  71/68/70/+16/0.22/.../..              43 S   AERO 41 S   RMY 45
10/10 76/61/69/+15/0.00/.../..              21 WNW AERO 20 WNW RMY 21 
10/11 68/55/62/+9/0.00/.../..               29 ENE AERO 25 ENE RMY 29 
10/12 58/48/50/0/T/.../..                   30 NE  AERO 28 ENE RMY 30 

10/13 Low temp since midnight is 48F; normal low is now 44F

DAILY RECORDS FOR OCTOBER

10/8/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
         BREAKS PREVIOUS RECORD OF 60F SET IN 1944

10/9/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
         BREAKS PREVIOUS RECORD OF 61F SET IN 2011

10/9/17: MONTHLY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
         BREAKS PREVIOUS RECORD OF 67F SET ON OCTOBER 13, 1990
         AND TIED ON OCTOBER 8, 2017

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

RECORDS FOR OCTOBER 13
HIGH 84F IN 1930,1954
LOW 29F IN 2012
PRECIP 5.92 INCHES IN 1895
SNOWFALL 4.2 INCHES IN 1934
PEAK GUST 46e MPH W IN 1950

RECORDS FOR OCTOBER 14
HIGH 79F IN 2000
LOW 28F IN 1958
PRECIP 2.69 INCHES IN 1990
SNOWFALL 2.0 INCHES IN 1913
PEAK GUST 63e W IN 1976

TODAY'S REPORT PREPARED BY: Kaitlin Geagan