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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 16, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY, COOL AND WINDY ATOP GREAT BLUE HILL....

We measured a total of 0.07 inches this morning from last
night's rain. The highest wind measured last night was 48 mph
from the west at 2:50 A.M. Winds remained strong this morning,
but decreased in intensity shortly after noontime. Weather 
remained fair today, with visibility being 80 miles  
after the 10 A.M. observation. Relative humidity has remained
under 50% since this morning. The high temperature so far today is
55F, which is 5 degrees below the normal of 60F. The low
since midnight is 41F, which is 2 degrees above the daily
normal minimum of 43F. 


Today's Observations:

7 A.M.
Weather: Scattered cirrus, few distant cumulus SW-NW
Temperature: 42F; Dew Point: 30F; Wind: W at 18G26 kts,
Peak Wind: 30 MPH (26 kts) @ 6:41 A.M. 
Sea-level pressure: 30.01 ins. Hg, rising steadily       
Visibility: 70 miles
6-hr Max temp: 52F
6-hr Min temp: 41F
24-hr Precip: 0.09 ins.   
BHO SA 1155 200 SCT 70 163/42/30/2718G26/001/ FEW DSNT CU SW-NW 
PK WND 2726/41/ 8/102 70009 51029 10052 20041

10 A.M.
Weather: Scattered cirrus, few distant cumulus S-NW
Temperature: 50F; Dew Point: 31F; Wind: S at 16G24 kts,
Peak wind: 32 MPH (28 kts) W at 9:43 A.M.  
Sea-level pressure: 30.04 ins. Hg, falling then rising 
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 200 SCT 80 172/50/31/2816G24/004/ FEW DSNT CU 
S-NW PK WND 2826/43/ 8/102 50009  

1 P.M.
Weather: Scattered cirrus, few distant cumulus E-NW
Temperature: 55F; Dew Point: 33F; Wind: W at 13G20 kts
Sea-level pressure: 29.99 ins. Hg, falling steadily    
Visibility: 80 miles
6-hr Max temp: 55F
6-hr Min temp: 42F 
6-hr Precip: 0.00 ins.
BHO SA 1755 250 SCT 80 159/55/33/2813G20/999/ FEW DSNT 
CU E-NW/ 8/102 58013 10055 20042
  
SUMMARY FOR MONDAY, OCTOBER 15, 2018 

TEMPERATURE (DEGREES F)
MAX.....66   NORMAL.....61
MIN.....44   NORMAL.....43
MEAN....55   NORMAL.....52

DEPARTURE FROM 30-YEAR NORMAL.......................+3
TOTAL DEPARTURE FOR THE MONTH.......................51 [+3.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............10   DEPARTURE.........-3
TOTAL HEATING UNITS FOR THE MONTH.............116   DEPARTURE........-48
TOTAL HEATING UNITS FOR THE SEASON............203   DEPARTURE.......-103
TOTAL HEATING UNITS LAST SEASON TO DATE.......150   DIFFERENCE.......+53

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....................46 W   AT 11:28  P.M.
                   AERO.........................46 W   AT 11:32  P.M.
                   ASOS.........................45 W   AT 11:57  P.M.
                   DAVIS........................47 WSW AT 10:39  P.M. RMY 21
FASTEST MILE FOR YESTERDAY......................33 W   AT 11:50  P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................31 SW  AT 10:29  P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................33 WSW AT 10:29  P.M.
AVERAGE WIND SPEED AND DIRECTION...............17.0 SSW
                   ASOS........................16.1 
                   DAVIS.......................16.2 SW [214 deg.]   

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.09  DEPARTURE......-0.06
                         ASOS..............0.07
TOTAL PRECIPITATION FOR THE MONTH..........2.75  DEPARTURE......+0.53
                         ASOS..............2.73 
TOTAL PRECIPITATION FOR THE YEAR..........49.95  DEPARTURE......+8.83
                         ASOS.............51.65 

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/01 75/58/67/-1/0.00/521/66        17 NE  AERO 15 NE  RMY 16
9/02 83/61/72/+4/0.00/684/87        20 SSW AERO 18 SSW RMY N/A
9/03 92/68/80/+13/0.00/650/83       24 WSW AERO 22 WSW RMY 25
9/04 88/70/79/+12/0.00/695/89       17 W   AERO 16 W   RMY 17
9/05 89/67/78/+11/0.00/638/82       23 SSW AERO 23 SSW RMY 25
9/06 92/70/81/+14/0.56/488/63       29 NNW AERO 29 NNW RMY N/A TSTM
9/07 70/63/67/+1/0.01/000/00        24 NE  AERO 22 NE  RMY N/A
9/08 68/54/61/-5/0.00/031/04        22 NE  AERO 18 NE  RMY 21
9/09 61/53/57/-9/0.00/000/00        23 NE  AERO 21 NE  RMY N/A
9/10 62/56/59/-6/0.94/000/00        30 E   AERO 28 E   RMY 28
9/11 75/61/68/+3/0.43/000/00        23 E   AERO 21 E   RMY N/A TSTM
9/12 69/63/66/+1/0.43/000/00        21 ENE AERO 21 ENE RMY 21  TSTM
9/13 68/62/65/+1/0.57/091/12        21 NE  AERO 21 NE  RMY N/A TSTM
9/14 75/61/68/+4/0.00/233/31        13 NE  AERO 12 ENE RMY 12
9/15 76/62/69/+5/0.01/218/29        14 SW  AERO 13 SW  RMY 13
9/16 84/61/73/+10/0.00/695/93       15 S   AERO 14 S   RMY N/A
9/17 82/64/73/+10/0.01/372/50       22 SSW AERO 22 SSW RMY N/A
9/18 74/67/71/+9/3.34/000/00        31 SSW AERO 30 SSW RMY N/A TSTM
9/19 66/57/62/0/0.09/007/01         28 NE  AERO 25 NE  RMY 26
9/20 63/55/59/-3/0.00/110/15        22 NE  AERO 21 NE  RMY 19
9/21 70/55/63/+2/0.00/352/48        37 SSW AERO 37 SSW RMY 41
9/22 70/51/61/0/0.07/175/24         37 SW  AERO 36 SW  RMY 30
9/23 60/47/54/-6/0.00/058/08        14 N   AERO 13 N   RMY N/A
9/24 55/50/53/-7/0.00/000/00        37 ENE AERO 35 ENE RMY 35
9/25 68/51/60/0/1.74/000/00         36 SE  AERO 37 SE  RMY 38
9/26 79/66/73/+14/0.39/244/34       35 SSW AERO 37 SSW RMY 37
9/27 66/56/61/+2/0.17/465/65        26 NNE AERO 25 NNE RMY 28
9/28 56/52/54/-4/0.49/029/04        24 NNE AERO 21 NNE RMY 23
9/29 71/50/61/+3/0.00/518/73        20 NW  AERO 18 NW  RMY 20
9/30 68/48/58/0/0.00/650/92         20 W   AERO 16 W   RMY N/A


DAILY RECORDS FOR SEPTEMBER

09/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F,
          BREAKS PREVIOUS RECORD OF 68F SET IN 1937 AND 1959

09/06/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 92F,
          TIES PREVIOUS RECORD OF 92F SET IN 1900 


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/..../.../..         21 ENE AERO 18 SSW RMY N/A
10/02 64/53/59/+2/..../.../..         33 S   AERO 32 S   RMY 35 TSTM
10/03 60/52/56/0/..../.../..          18 NNE AERO 14 NNE RMY 14
10/04 69/57/63/+7/..../.../..         29 SSW AERO 29 SSW RMY 32
10/05 64/47/56/0/..../.../..          25 NE  AERO 21 NE  RMY 24
10/06 64/45/55/0/0.00/.../..          23 SSW AERO 23 SSW RMY 25
10/07 75/56/66/+11/..../.../..        28 NE  AERO 24 ENE RMY 27
10/08 56/53/55/+1/..../.../..         22 ENE AERO 20 ENE RMY N/A
10/09 75/56/66/+12/..../.../..        26 WSW AERO 28 SW  RMY 29
10/10 82/65/74/+20/..../.../..        24 WSW AERO 23 WSW RMY 25
10/11 70/56/63/+10/..../.../..        48 NNE AERO 47 NNE RMY 50
10/12 59/44/52/-1/..../.../..         32 NW  AERO 32 NW  RMY 33
10/13 49/40/45/-8/..../.../..         21 WNW AERO 20 WNW RMY 20
10/14 55/37/46/-6/..../.../..         21 W   AERO 18 W   RMY 21
10/15 66/44/55/+3/..../.../..         46 W   AERO 46 W   RMY 54

10/16 Low temp since midnight is 41F; normal low is 43F

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

RECORDS FOR OCTOBER 16
HIGH 86F IN 1897
LOW 28F IN 1886
PRECIP 2.82 INCHES IN 1974
SNOWFALL TRACE IN 2009
PEAK GUST 68e MPH SSE IN 1954 (HURRICANE HAZEL)

RECORDS FOR OCTOBER 17
HIGH 86F IN 1947
LOW 25F IN 1886
PRECIP 1.87 INCHES IN 1989
SNOWFALL TRACE IN 1970
PEAK GUST 55 MPH NE IN 1964

TODAY'S REPORT PREPARED BY: Benjamin Turner