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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JUNE 11, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

A COOLER THAN SEASONABLE DAY WITH GOOD VISIBILITY AND DECREASING
CLOUDS....

We observed 70 miles of visibility between 10 A.M. and 1 P.M., along
with decreasing clouds since morning. The air has stayed dry, with 
the humidity staying around 55%. Light winds have picked up slightly
since this morning, and have shifted from east to northeast. The 
maximum temperature so far today is 68F, six degrees below the normal
of 74F. The low since midnight was 54F, two degrees below the normal of 56F. 

Today's Observations:

7 A.M.
Weather: Scattered stratocumulus, overcast cirrostratus
Temperature: 59F; Dew Point: 43F; Wind: ESE at 4 kts,
Wind: Light  
Sea-level pressure: 30.08 ins. Hg, rising, then more rapidly
Visibility: 40 miles, thin smoke layer in all directions
6-hr Max temp: 59F
6-hr Min temp: 54F
24-hr Precip: 0.00 ins.
BHO SA 1155 60 SCT E250 OVC 40 187/59/43/1204/008/ 
FEW CU N-NE THN K LYR ALQDS WND LGT/ 8/808 53012 
10059 20054

10 A.M.
Weather: Scattered cumulus, broken cirrostratus
Temperature: 62F; Dew Point: 45F; Wind: E at 4 kts,
Wind: Light
Sea-level pressure: 30.12 ins. Hg, rising, then more rapidly
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 60 SCT E250 BKN 70 200/62/45/1004/012/ 
FEW CU W-NNW WND LGT/ 8/508 53013

1 P.M.
Weather: Scattered cumulus, broken altocumulus, 
broken cirrostratus
Temperature: 67F; Dew Point: 47F; Wind: NE at 8G14 kts
Sea-level pressure: 30.11 ins. Hg, falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 68F
6-hr Min temp: 58F
6-hr precip: 0.00 ins.
BHO SA 1755 50 SCT E95 BKN 250 BKN 70 196/67/47/0408G14/011/ 
8/188 58004 10068 20058


SUMMARY FOR SUNDAY, JUNE 10, 2018

TEMPERATURE (DEGREES F)
MAX.....72   NORMAL.....73
MIN.....56   NORMAL.....56
MEAN....64   NORMAL.....65

DEPARTURE FROM 30-YEAR NORMAL.........................-1
TOTAL DEPARTURE FOR THE MONTH........................-21 [-2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............1   DEPARTURE...........-2
TOTAL HEATING UNITS FOR THE MONTH.............51   DEPARTURE..........+11
TOTAL HEATING UNITS FOR THE SEASON..........5898   DEPARTURE.........-445
TOTAL HEATING UNITS LAST SEASON TO DATE.....5721   DIFFERENCE........+177

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE..........-3
TOTAL COOLING UNITS FOR THE MONTH..............12   DEPARTURE..........-9
TOTAL COOLING UNITS FOR THE SEASON.............74   DEPARTURE.........+29
TOTAL COOLING UNITS LAST SEASON TO DATE........65   DEPARTURE..........+9

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................20  S   AT 5:22 P.M.
                   AERO.........................18  S   AT 5:17 P.M. 
                   ASOS.........................20  S   AT 5:12 P.M.
                   DAVIS........................20  M   AT 5:15 P.M.** RMY 17
FASTEST MILE FOR YESTERDAY......................15  S   AT 5:12 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................15  S   AT 5:12 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..................14  M   AT 5:12 P.M.**
AVERAGE WIND SPEED AND DIRECTION...............8.4 S
                   ASOS........................8.6
                   DAVIS.......................8.3
** Davis direction malfunctioning 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.16
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.01  DEPARTURE......-0.64
                         ASOS..............1.04  
TOTAL PRECIPITATION FOR THE YEAR..........28.33  DEPARTURE......+4.20
                         ASOS.............29.91

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

6/01 78/62/70/+8/T/.../..            21 S   AERO 21 S   RMY N/A
6/02 79/54/67/+5/0.00/.../..         26 ENE AERO 25 ENE RMY 27
6/03 59/45/52/-10/0.00/.../..        28 ENE AERO 25 ENE RMY N/A  
6/04 52/45/49/-14/.../.../..         29 ENE AERO 26 ENE RMY 29
6/05 64/47/56/-7/..../.../..         24 N   AERO 21 N   RMY 23 TSTM  
6/06 66/50/58/-5/0.00/.../..         23 S   AERO 21 S   RMY 22
6/07 69/50/60/-4/0.00/.../..         25 S   AERO 25 S   RMY 27 
6/08 79/52/66/+2/0.00/.../..         20 SW  AERO 17 SW  RMY 18
6/09 79/58/69/+5/0.00/.../..         22 W   AERO 21 W   RMY 22
6/10 72/56/64/-1/0.00/.../..         20 S   AERO 18 S   RMY 17

6/11 Low temp since midnight is 54F; normal low is now 56F


DAILY RECORDS FOR JUNE 2018

None so far.


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

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

RECORDS FOR JUNE 12
HIGH 94F IN 2017
LOW 40F IN 1906
PRECIP 1.79 INS 1955
PEAK GUST 58 MPH NW IN 1991

TODAY'S REPORT PREPARED BY: Benjamin Turner