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

THURSDAY, JUNE 18, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

HOT AND HUMID IN THE MORNING HOURS....

We observed partly cloudy skies, with 
limited visibility this morning due to 
fog. It increased, going from a 1/2 mile
to 85 miles at the 1 P.M. observation. 
Wind increased as the day went on, coming
from the south with a max gust of 20 mph.

Great Blue Hill is lacking in the rainfall
department, being 0.81 inches below the 
monthly normal. While that quantity seems
small, we are currently 3.68 inches below
the normal seasonal amount.  

The high so far today is 85 degrees, this
is 9 degrees above the daily normal high
of 76F. The low since midnight is 59F,
which is a degree higher than the daily normal
low of 58F.


Today's Observations:

7 A.M.
Weather: Fog
Temperature: 63F; Dew Point: 63F; Relative Humidity: 100%
Wind: SE at 7 kts  
Sea-level pressure: 30.23 ins. Hg: steady, then rising
Visibility: 1/2 miles, fog
6-hr Max temp: 63F
6-hr Min temp: 59F
24-hr Precip:  0.00 ins
24-hr Snowfall: 0.0 ins.
BHO SA 1155 X W3 1/2F 236/63/63/2207/023/ 8//// 53012 10063 
20059

10 A.M.
Weather: Scattered cumulus, cirrus 
Temperature: 77F; Dew Point: 63F; Relative Humidity: 62%
Wind: S at 5 kts, light 
Sea-level pressure: 30.21 ins. Hg: falling steadily
Visibility: 75 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 50 SCT 250 SCT 75 229/77/63/1905/021/ WND LGT/ 
8/101 58007

1 P.M.
Weather: Scattered cumulus/ altostratus, broken cirrus
Temperature: 84F; Dew Point: 63F; Relative Humidity: 50%
Wind: S at 9G15 kts
Sea-level pressure: 30.16 ins. Hg: falling steadily
Visibility: 85 miles
6-hr Max temp: 85F
6-hr Min temp: 63F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 50 SCT 140 SCT 250 BKN 85 214/84/63/1909G15/016/ 
8/111 58015 10085 20063


SUMMARY FOR WEDNESDAY, JUNE 17, 2020 

TEMPERATURE (DEGREES F)
MAX.....78   NORMAL.....76
MIN.....57   NORMAL.....58
MEAN....68   NORMAL.....67

DEPARTURE FROM 30-YEAR NORMAL..................+1
TOTAL DEPARTURE FOR THE MONTH.................+18 [+0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY................0  DEPARTURE....... -2
TOTAL HEATING UNITS FOR THE MONTH...............40  DEPARTURE.......-18
TOTAL HEATING UNITS FOR THE SEASON............5852  DEPARTURE......-509
TOTAL HEATING UNITS LAST SEASON TO DATE.......6252  DEPARTURE......-400

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY................3  DEPARTURE....... -1
TOTAL COOLING UNITS FOR THE MONTH...............45  DEPARTURE........+1
TOTAL COOLING UNITS FOR THE SEASON..............77  DEPARTURE........+9
TOTAL COOLING UNITS LAST SEASON TO DATE.........35  DEPARTURE.......+42

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................20 S   AT  7:37 P.M.  
                   AERO.........................20 S   AT  7:34 P.M.  
                   ASOS.........................21 S   AT  7:38 P.M. 
                   DAVIS........................21 S   AT  7:38 P.M. RMY 20
FASTEST MILE FOR YESTERDAY......................15 SSW AT 10:11 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................15 SSW AT 10:11 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................14 S   AT  7:39 P.M.
AVERAGE WIND SPEED AND DIRECTION...............5.9 SE               
                   ASOS........................6.5
                   DAVIS.......................6.1 SSE [155 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.91  DEPARTURE......-0.81
                         ASOS..............1.91
TOTAL PRECIPITATION FOR THE YEAR..........21.70  DEPARTURE......-3.68
                         ASOS.............22.22


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

06/01  64/42/53/-9/T/0.0/.../..            28 WNW  AERO 29 WNW RMY 28
06/02  72/45/59/-3/..../0.0/.../..         28 W    AERO 27 W   RMY 28
06/03  79/55/67/+5/T/0.0/.../..            29 W    AERO 28 W   RMY 26
06/04  87/62/75/+12/..../0.0/.../..        26 W    AERO 25 S   RMY N/A
06/05  80/65/73/+10/..../0.0/.../..        28 SSW  AERO 28 SSW RMY N/A TSTM
06/06  86/57/72/+9/..../0.0/.../..         55 SW   AERO 59 SW  RMY 59  TSTM
06/07  68/54/61/-3/0.00/0.0/.../..         24 NW   AERO 24 NW  RMY N/A
06/08  77/51/64/0/0.00/0.0/.../..          25 W    AERO 24 W   RMY 25
06/09  77/60/69/+5/T/.../..                23 E    AERO 21 E   RMY N/A
06/10  70/58/64/-1/T/0.0/.../..            25 E    AERO 24 E   RMY N/A
06/11  71/64/68/+3/0.62/0.0/.../..         40 S    AERO 40 S   RMY 42
06/12  82/63/73/+8/0.00/.../..             26 W    AERO 25 W   RMY 27
06/13  71/53/62/-3/0.00/.../..             21 WNW  AERO 20 WNW RMY N/A            
06/14  67/49/58/-8/0.00/.../..             21 E    AERO 21 ENE RMY 21
06/15  67/53/60/-6/5/0/.../..              21 NE   AERO 16 ENE RMY 20
06/16  73/54/64/-2/0.00/.../..             18 E    AERO 18 E   RMY 18
06/17  78/57/68/+1/0.00/.../..             20 S    AERO 20 S   RMY 20

06/18 The low since midnight is 59F, the daily normal low is 58F

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

RECORDS FOR JUNE 18
HIGH 93F IN 1929,1994
LOW 39F IN 1920
PRECIP 3.36 INS 1998
PEAK GUST 48e MPH W IN 1943

RECORDS FOR JUNE 19
HIGH 92F IN 1923
LOW 40F IN 1920
PRECIP 3.92 INS 1922
PEAK GUST 66e MPH NW IN 1940

TODAY'S REPORT PREPARED BY: Benjamin Turner