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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JUNE 21, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

MILD AND GLOOMY DAY WITH PASSING SHOWERS ON TOP OF 
GREAT BLUE HILL….

Overnight rainfall left 0.43 inches in the gauge at 7 A.M, 
making the 24 hour precipitation total ending at 7 A.M 
0.90 inches. Passing showers throughout the day, however, 
only left a trace at the 10 A.M observation. A few breaks in 
the clouds allowed for the sun to shine for a short while at
mid-day. Clouds thickened later in the afternoon with heavy 
downpours in the distance. The high so far today is 68F, nine 
degrees below the daily maximum temperature of 77F. Our low 
since midnight was 61F, which is two degrees above our normal 
minimum temperature for today of 59F.   


Today's Observations:

7 A.M.
Weather: broken stratus, few stratus fractus
Temperature: 59F; Dew Point: 59F; Wind: N at 7 kts,
Sea-level pressure: 29.48 ins. Hg, rising steadily
Visibility: 35 mile
6-hr Max temp: 67F
6-hr Min temp: 58F
24-hr Precip: 0.90 ins.
BHO SA 1155 E45 BKN 35 984/59/59/3607/948/ FEW SF ALQDS/ 
8/600 70090 53008 10067 20058

10 A.M.
Weather: light drizzle, overcast nimbostratus
Temperature: 63F; Dew Point: 59F; Wind: N at 9 kts
Sea-level pressure: 29.51 ins. Hg, rising then, steady
Visibility: 35 mile
3-hr Precip: 0.00 ins.
BHO SA 1455 E100 OVC 35L- 994/63/59/3509/951/ L-EUKN/ 
8/020 51013

1 P.M.
Weather: overcast cumulus & stratocumulus
Temperature: 67F; Dew Point: 61F; Wind: WSW at 10G18 kts
Sea-level pressure: 29.53 ins. Hg, rising then, steady
Visibility: 40 mile, 10 mile NW-N
6-hr Max temp: 68F
6-hr Min temp: 59F
6-hr Precip: 0.00 ins. 
BHO SA 1755 E45 OVC 40 001/67/61/3410G18/953/ VSBY 10 NW-W/
8/8// 51007 10068 20059


SUMMARY FOR THURSDAY, JUNE 20, 2019 

TEMPERATURE (DEGREES F)
MAX.....69   NORMAL.....77
MIN.....61   NORMAL.....59
MEAN....65   NORMAL.....68

DEPARTURE FROM 30-YEAR NORMAL......................-3
TOTAL DEPARTURE FOR THE MONTH......................+4 [+0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............0   DEPARTURE.........0
TOTAL HEATING UNITS FOR THE MONTH..............31   DEPARTURE........-31
TOTAL HEATING UNITS FOR THE SEASON...........6250   DEPARTURE.......-116
TOTAL HEATING UNITS LAST SEASON TO DATE......5909   DIFFERENCE......+341

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE.........-3
TOTAL COOLING UNITS FOR THE MONTH..............32   DEPARTURE........-23
TOTAL COOLING UNITS FOR THE SEASON.............40   DEPARTURE........-39
TOTAL COOLING UNITS LAST SEASON TO DATE.......115   DEPARTURE........-75

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................26 S AT  4:26 P.M.
                   AERO.........................26 S AT  4:27 P.M.
                   ASOS.........................28 S AT  4:28 P.M.
                   DAVIS........................33 S AT  4:25 P.M. RMY 29
FASTEST MILE FOR YESTERDAY......................23 S AT  4:25 P.M
MAXIMUM 2-MINUTE ASOS AVERAGE...................22 S AT  4:28 P.M
MAXIMUM 2-MINUTE DAVIS AVERAGE..................23 S AT  4:22 P.M
AVERAGE WIND SPEED AND DIRECTION..............8.0 S
                   ASOS.......................8.5
                   DAVIS......................8.4 SEE [162 deg.]
 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.90  DEPARTURE.......+0.77
                         ASOS..............0.88
TOTAL PRECIPITATION FOR THE MONTH..........3.38  DEPARTURE.......+0.24
                         ASOS..............3.36
TOTAL PRECIPITATION FOR THE YEAR..........29.17  DEPARTURE.......+3.37
                         ASOS.............29.09


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 71/54/63/+1/0.00/.../..               21 E   AERO 20 E   RMY 18
06/02 75/51/63/+1/..../.../..               23 S   AERO 21 S   RMY N/A
06/03 69/50/60/-2/..../.../..               41 W   AERO 39 W   RMY 43
06/04 70/45/58/-5/0.00/.../..               29 W   AERO 23 W   RMY N/A
06/05 81/57/69/+6/..../.../..               33 SSW AERO 33 SSW RMY N/A
06/06 75/64/70/+6/..../.../..               28 SSW AERO 28 SSW RMY N/A
06/07 80/59/70/+6/0.00/.../..               23 S   AERO 23 S   RMY 22
06/08 78/57/68/+4/0.00/.../..               23 ENE AERO 21 SW  RMY 21
06/09 78/55/67/+3/0.00/.../..               22 S   AERO 21 S   RMY 21
06/10 79/54/67/+2/..../.../..               26 SSE AERO 25 SSE RMY 33 
06/11 73/58/66/+1/..../.../..               32 NW  AERO 30 NW  RMY 35
06/12 75/52/64/-1/..../.../..               25 SSW AERO 25 S   RMY 28
06/13 55/49/52/-13/..../.../..              36 NE  AERO 35 NE  RMY 35
06/14 72/50/61/-5/0.00/.../..               38 W   AERO 39 W   RMY 38
06/15 79/54/67/+1/0.00/.../..               38 SSW AERO 41 SSW RMY 40
06/16 70/62/66/0/..../.../..                32 SW  AERO 35 SW  RMY N/A
06/17 74/62/68/+1/..../.../..               12 SSE AERO 18 NW  RMY 17
06/18 71/62/67/0/..../.../..                17*S   AERO 17 S   RMY 16
06/19 74/61/68/+1/..../.../..               16 SSE AERO 20 SSE RMY 19
06/20 69/61/65/-3/..../.../..               26 S   AERO 26 S   RMY 29

Low temp since midnight is 58F; normal low is 59F

*Estimated

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

RECORDS FOR JUNE 21
HIGH 94F IN 2012
LOW 42F IN 1940
PRECIP 1.40 INS 1903
PEAK GUST 51 MPH SSW IN 2000

RECORDS FOR JUNE 22
HIGH 93F IN 1921, 2012
LOW 43F IN 1940
PRECIP 1.57 INS IN 1900
PEAK GUST 74 MPH NW IN 1988

TODAY'S REPORT PREPARED BY: Nicholas Rousseau