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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, AUGUST 17, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

EXTREMELY PLEASANT SUMMER DAY WITH DEW POINTS IN THE 40s

Temperatures fell to 58F this morning and had risen to
79F by 1:00PM.  The lower temperatures combined with dew
points in the upper 40s made for a very pleasant summer
day.  High cirrus clouds covered the sky during the
morning observations but had become scattered in the
afternoon while a few diurnal cumulus were forming.  The
hazy conditions of the past two days cleared out of the
area under the high pressure and westerly winds to give
us great visibility ranging from 60 to 70 miles.


Today's Observations:

7 A.M.
Weather: Few altocumulus WNW-E, broken cirrus
Temperature: 63F; Dew Point: 49F; Wind: NW at 5 kts,
Wind speed: Light
Sea-level pressure: 30.08 ins. Hg, rising, then more quickly
Visibility: 70 miles
6-hr Max temp: 64F
6-hr Min temp: 58F
24-hr precip: 0.00 in.
BHO SA 1155 E300 BKN 70 185/63/49/3105/008/ FEW AC WNW-E WND LGT/
8/031 53013 10064 20058

10 A.M.
Weather: Broken cirrus
Temperature: 70F; Dew Point: 48F; Wind: estimated W at 2 kts,
Wind speed: Light and variable
Sea-level pressure: 30.08 ins. Hg, falling then rising
Visibility: 70 miles
BHO SA 1455 E300 BKN 70 185/70/48/E2602/008/ WND L/V/ 8/001 50000

1 P.M. 
Weather: Few cumulus NW-NE, scattered cirrus
Temperature: 77F; Dew Point: 48F; Wind: W at 5 kts,
Wind: Light and variable
Sea-level pressure: 30.03 ins. Hg, falling, then more quickly
Visibility: 60 miles
6-hr Max temp: 79F 
6-hr Min temp: 63F
BHO SA 1755 300 SCT 60 169/77/48/2805/003/ FEW CU NW-NE WND L/V/
8/101 58016 10079 20063


SUMMARY FOR WEDNESDAY, AUGUST 16, 2017
 
TEMPERATURE (DEGREES F)
MAX.....83   NORMAL.....79
MIN.....64   NORMAL.....62
MEAN....74   NORMAL.....71

DEPARTURE FROM 30-YEAR NORMAL.........................+3
TOTAL DEPARTURE FOR THE MONTH.........................+9 [+0.4 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............9   DEPARTURE..........+3
TOTAL COOLING UNITS FOR THE MONTH.............114   DEPARTURE..........+5
TOTAL COOLING UNITS FOR THE SEASON............535   DEPARTURE.........+75
TOTAL COOLING UNITS LAST SEASON TO DATE.......647   DEPARTURE........-112

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................23 NW  AT  3:40 P.M.*
                   AERO........................23 NW  AT  3:39 P.M.
                   ASOS........................25 NW  AT 12:44 P.M.
                   DAVIS.......................23 NW  AT 12:43 P.M. RMY 25
FASTEST MILE FOR YESTERDAY.....................17 NW  AT  4:07 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................17 NW  AT  4:08 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................16 WNW AT  4:07 P.M.
AVERAGE WIND SPEED AND DIRECTION.............10.1 NNW
                   ASOS......................10.3
                   DAVIS......................8.8 NW [312 DEG.]
*last of multiple occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.39  DEPARTURE......-0.84
                         ASOS..............1.38
TOTAL PRECIPITATION FOR THE YEAR..........36.15  DEPARTURE......+2.93
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings


PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

8/1  87/65/76/+4/0.00/762/88               16 ESE*AERO 16 NNW RMY 16
8/2  86/65/76/+4/1.09/372/43               32 W   AERO 36 W   RMY 34 TSTM
8/3  83/65/74/+2/0.00/552/64               22 S   AERO 23 S   RMY 24
8/4  84/66/75/+3/0.00/697/81               26 S   AERO 30 S   RMY 29
8/5  75/63/69/-3/0.10/060/07               23 NW  AERO 28 NW  RMY 29
8/6  76/57/67/-5/0.00/795/93               30 NW  AERO 32 NW  RMY 31
8/7  76/60/68/-4/0.01/597/70               28 SSW AERO 28 SSW RMY 29
8/8  74/60/67/-5/0.02/000/00               17 S   AERO 16 SSE RMY 16
8/9  83/58/71/-1/0.00/.../..               18 S   AERO 18 S   RMY 19 
8/10 86/63/75/+4/T/.../..                  20 S   AERO 18 S   RMY 20
8/11 82/63/73/+2/0.00/.../..               17 S   AERO 16 S   RMY 17
8/12 75/57/66/-5/0.17/.../..               22 SSW*AERO 22 SSW RMY 23
8/13 84/67/76/+5/0.00/.../..               26 WNW AERO 24 WNW RMY 26
8/14 82/67/75/+4/0.00/.../..               14 SSW*AERO 14 S   RMY 15
8/15 79/64/72/+1/T/.../..                  21 S   AERO 21 S   RMY 23
8/16 83/64/74/+3/0.00/.../..               23 NW* AERO 23 NW  RMY 25

8/17 Low temp since midnight is 58F; normal low is now 62F


DAILY RECORDS FOR AUGUST

None so far.


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

RECORDS FOR AUGUST 17
HIGH 97F IN 1944
LOW 48F IN 1902
PRECIP 2.17 INCHES IN 1998
PEAK GUST 50e MPH SSW IN 1952, 50 MPH WNW IN 1962

RECORDS FOR AUGUST 18
HIGH 93F IN 2002
LOW 47F IN 1824
PRECIP 5.75 INCHES IN 1955 [DIANE]
PEAK GUST 46 MPH WNW IN 2007

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle