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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JUNE 11, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

WARMING CONTINUES ON TOP OF GREAT BLUE HILL

We are beginning a dry warming trend here on top of Great Blue Hill. 
We have had a maximum temperature of 86F by 1:00 P.M. This is over 
10 degrees above our climatological normal of 74F. Winds coming from 
the south/ southwest were lighter in the morning and slightly increased 
in the afternoon with a peak wind of 28 MPH by 1:00 P.M.

Relative humidity decreased from 66% at 7:00 A.M. to 39% at 1:00 P.M.
Visibility increased throughout the day with hazy morning conditions 
clearing before 10:00 A.M. observation but a distant haze lingered 
all day.

Today's Observations:

7 A.M.
Weather: Clear, few cirrostratus in all directions
Temperature: 73F; Dew Point: 61F; Wind: SW at 9 kts
Sea-level pressure: 30.03 ins. Hg, rising then steady
Visibility: 20 miles
6-hr Max temp: 73F
6-hr Min temp: 64F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 20 168/73/61/2309/003/ FEW CS ALQDS HAZY/
8/005 51010 10073 20064

10 A.M.
Weather: Broken cirrostratus
Temperature: 82F; Dew Point: 63F; Wind: WSW at 9 kts
Sea-level pressure: 30.01 ins. Hg, falling, then more slowly
Visibility: 40 miles
BHO SA 1455 E220 BKN 40 164/82/63/2509/001/ HAZY/ 8/004 55004

1 P.M.
Weather: Few altocumulus, Broken cirrostratus
Temperature: 85F; Dew Point: 57F; Wind: SW at 10G19 kts
Sea-level pressure: 29.96 ins. Hg, falling, then more quickly
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 86F
6-hr Min temp: 72F
BHO SA 1755 E250 BKN 40 144/85/57/2310G19/996/ FEW AC ALQDS
DSNT HZ ALQDS/ 8/066 58020 10086 20072

SUMMARY FOR SATURDAY, JUNE 10, 2017

TEMPERATURE (DEGREES F)
MAX.....83   NORMAL.....73
MIN.....59   NORMAL.....56
MEAN....71   NORMAL.....65

DEPARTURE FROM 30-YEAR NORMAL.........................+6
TOTAL DEPARTURE FOR THE MONTH........................-32 [-3.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............0   DEPARTURE..........-6
TOTAL HEATING UNITS FOR THE MONTH..............59   DEPARTURE.........+19
TOTAL HEATING UNITS FOR THE SEASON...........5721   DEPARTURE........-622
TOTAL HEATING UNITS LAST SEASON TO DATE......5270   DIFFERENCE.......+451

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............6   DEPARTURE..........-6
TOTAL COOLING UNITS FOR THE MONTH...............9   DEPARTURE.........-12
TOTAL COOLING UNITS FOR THE SEASON.............65   DEPARTURE.........+20
TOTAL COOLING UNITS LAST SEASON TO DATE........67   DEPARTURE..........-2

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................25 SSW AT 2:07 P.M.
                   AERO........................28 SSW AT 1:22 P.M.
                   ASOS........................27 S   AT 2:07 P.M.
                   DAVIS.......................26 M   AT 2:07 P.M. RMY 18
FASTEST MILE FOR YESTERDAY.....................20 SSW AT 2:52 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................21 S   AT 2:07 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................19 M   AT 2:07 P.M.
AVERAGE WIND SPEED AND DIRECTION.............12.3 SSW
                   ASOS......................12.7
                   DAVIS.....................10.6 (M)

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.......0.00
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........3.12  DEPARTURE......+1.47
                         ASOS..............3.20
TOTAL PRECIPITATION FOR THE YEAR..........28.46  DEPARTURE......+4.15
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR JUNE 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

6/1  78/55/67/+5/0.06/.../..               39 NW  AERO 39 NW  RMY 41
6/2  70/50/60/-2/T/.../..                  32 WNW AERO 35 WNW RMY 34
6/3  66/47/57/-5/0.01/.../..               23 NW  AERO 25 NW  RMY 24
6/4  71/49/60/-3/0.28/.../..               21 SSE*AERO 21 SW  RMY N/A
6/5  55/49/52/-11/1.20/000/00              32 NE  AERO 35 NE  RMY N/A
6/6  49/45/47/-16/..../000/00              40 ENE AERO 43 ENE RMY 43
6/7  65/47/56/-8/..../.../..               21 NNE AERO 18 NE* RMY 20
6/8  76/52/64/0/0.00/.../..                21 SSE AERO 21 SSE RMY 18
6/9  78/53/66/+2/..../.../..               48 N   AERO 54 N   RMY 52 TSTM
6/10 83/59/71/+6/0.00/.../..               25 SSW AERO 28 SSW RMY 27  

6/11 Low temp since midnight is 64F; normal low is now 56F

DAILY RECORDS FOR JUNE
None so far.

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

RECORDS FOR JUNE 12
HIGH 92F IN 1973
LOW 40F IN 1906
PRECIP 1.79 INS 1955
PEAK GUST 58 MPH NW IN 1991

RECORDS FOR JUNE 11
HIGH 92F IN 1973, 1984
LOW 40F IN 1972
PRECIP 2.66 INCHES IN 1922
PEAK GUST 43e MPH S IN 1945

TODAY'S REPORT PREPARED BY: Kaitlin Geagan