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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, OCTOBER 20, 2016  
ALL TIMES ARE IN EASTERN STANDARD TIME

COOLER AND DRIER TODAY,
YESTERDAY'S TEMPS. TOO COOL FOR NEW RECORDS

Last night's temperatures cooled too quickly for a record high minimum
temp. and reached 58F at midnight before cooling further for an overnight
minimum of 54F at 6:30AM EST this morning.  Temperatures have been cooler
today, but they are still slightly above normal levels.

Winds shifted easterly shortly after midnight.  Dew points have decreased
into the low 50s with this change in flow.  Cloud cover has increased
throughout the day as high pressure moved out of the region.  


7 A.M. 
Weather: Few cirrus in all directions
Temperature: 57F; Dew Point: 50F; Wind: E at 12G18 kts
Sea-level pressure: 30.23 ins. Hg, rising, then more quickly
Visibility: 30 miles, distant fog
6-hr Max temp: 57F
6-hr Min temp: 54F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 30 238/57/50/0812G18/023/ FEW CI ALQDS DSNT FG/
8/001 53012 10057 20054

10 A.M.
Weather: Few cumulus in all directions, scattered cirrus
Temperature: 62F; Dew Point: 50F; Wind: E at 9 kts
Sea-level pressure: 30.24 ins. Hg, rising then falling
Visibility: 40 miles
BHO SA 1455 250 SCT 40 240/62/50/0809/024/ FEW CU ALQDS/ 8/101 50002

1 P.M.
Weather: Scattered cumulus, broken altocumulus
Temperature: 63F; Dew Point: 53F; Wind: E at 11G19 kts
Sea-level pressure: 30.19 ins. Hg, falling, then more quickly
Visibility: 30 miles, except 40 miles SE-SW
6-hr Max. temp: 64F
6-hr Min. temp: 56F
BHO SA 1755 15 SCT E140 BKN 20 224/63/53/0911G19/019/ VSBY 40 SE-SW/
8/130 58016 10064 20056

SUMMARY FOR WEDNESDAY, OCTOBER 19, 2016
 
TEMPERATURE (DEGREES F)
MAX.....79   NORMAL.....59
MIN.....58   NORMAL.....42
MEAN....69   NORMAL.....50

DEPARTURE FROM 30-YEAR NORMAL.......................+19
TOTAL DEPARTURE FOR THE MONTH.......................+73 [+3.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............4   DEPARTURE..........+4
TOTAL COOLING UNITS FOR THE MONTH...............6   DEPARTURE..........+1
TOTAL COOLING UNITS FOR THE SEASON............900   DEPARTURE........+298
TOTAL COOLING UNITS LAST SEASON TO DATE.......810   DIFFERENCE........+90 

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............0   DEPARTURE.........-15
TOTAL HEATING UNITS FOR THE MONTH.............148   DEPARTURE.........-73
TOTAL HEATING UNITS FOR THE SEASON............223   DEPARTURE........-140
TOTAL HEATING UNITS LAST SEASON TO DATE.......281   DIFFERENCE........-58

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................29 SSW AT  12:26 A.M.
                   ASOS........................32 SSW AT  12:27 A.M.
                   DAVIS.......................30  S  AT  12:26 A.M. RMY N/A 
FASTEST MILE FOR YESTERDAY.....................23 SSW AT  12:25 A.M.     
MAXIMUM 2-MINUTE ASOS AVERAGE..................23 SSW AT  12:52 A.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE.................22 SSW AT  12:26 A.M.   
AVERAGE WIND SPEED AND DIRECTION.............12.2 SSW
                   ASOS......................12.2
                   DAVIS.....................11.0 W [255 Deg.]
*last of several occurrences

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..........3.84  DEPARTURE......+1.01
                         ASOS..............3.86
TOTAL PRECIPITATION FOR THE YEAR..........31.16  DEPARTURE.....-10.75
                         ASOS.............31.50 
 

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  57/52/55/-2/1.22/000/00                 33 NNE AERO  M  RMY 34
10/2  55/52/54/-3/0.19/.../..                 23 N   AERO  M  RMY N/A
10/3  69/53/61/+5/0.00/.../..                 21 ENE AERO  M  RMY 20
10/4  61/47/54/-2/T/.../..                    26 NE  AERO  M  RMY 27
10/5  61/44/53/-3/0.00/.../..                 22 NE  AERO  M  RMY 21
10/6  71/46/59/+4/0.00/.../..                 16 SW* AERO  M  RMY 15
10/7  75/54/65/+10/0.00/.../..                16 S   AERO  M  RMY 16
10/8  69/53/61/+7/0.00/.../..                 23 SSW AERO  M  RMY 23
10/9  63/44/54/0/1.89/.../..                  28 N   AERO  M  RMY 34
10/10 57/40/49/-5/0.00/.../..                 32 NW  AERO  M  RMY 32
10/11 62/39/51/-2/0.00/.../..                 17 N   AERO  M  RMY N/A
10/12 68/49/59/+6/0.00/.../..                 17 S   AERO  M  RMY 17
10/13 71/52/62/+9/T/.../..                    24 SSW AERO  M  RMY 28
10/14 58/41/50/-2/0.00/.../..                 26 NNW AERO  M  RMY 25
10/15 58/38/48/-4/0.00/.../..                 23 S   AERO  M  RMY 26
10/16 68/46/57/+6/0.00/.../..                 28 SSW AERO  M  RMY 30
10/17 76/58/67/+16/0.00/.../..                23 WSW AERO  M  RMY N/A
10/18 74/56/65/+14/0.54/.../..                35 SSW AERO  M  RMY 37
10/19 79/58/69/+19/0.00/.../..                29 SSW AERO  M  RMY N/A

10/20 Low temp since midnight is 54F; normal low is now 41F

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

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

RECORDS FOR OCTOBER 21
HIGH 79F IN 1979
LOW 24F IN 1974
PRECIP 2.39 INCHES IN 1944
SNOWFALL TRACE IN 1895,1907,1940
PEAK GUST 69e MPH S IN 1976

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle