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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JUNE 22, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

CALM WEATHER CONTINUES WITH TEMPERATURES A LITTLE COOLER

Quiet, calm weather has continued today. We began the morning with a low of 
56F, a few degrees cooler than normal. Temperatures have steadily risen to a 
high so far of 72F, also a little cooler than normal. A light but persistent
wind off the ocean has kept temperatures below those of the past several 
days. Yesterday marked three consecutive days with a high temperature of
81F. We've had plenty of sunshine today, though high clouds have increased 
and filtered the Sun as the day has gone on. Visibility was a spectacular 
85 miles early this morning, but had dropped to 65 miles by afternoon with 
a building haze.

Today's Observations:

7 A.M.
Weather: Mostly clear, few stratocumulus distant ENE-S, few cirrus
distant ESE-W, thin smoke layer above horizon SW-N
Temperature: 62F; Dew Point: 52F; Wind: ENE at 9 kts
Sea-level pressure: 30.05 ins. Hg, rising, then more rapidly 
6-hr Max temp: 62F
6-hr Min temp: 56F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 85 175/62/52/0609/005/ FEW SC DSNT ENE-S 
FEW CI DSNT ESE-W THN K LYR ABV HRZN SW-N/ 8/501 53024 10062 20056

10 A.M.
Weather: Scattered cirrus, few small cumulus N and E-SE, 
few stratocumulus distant SE-SW
Temperature: 70F; Dew Point: 56F; Wind: ENE at 8 kts,
Wind: Direction variable NNE-E
Sea-level pressure: 30.07 ins. Hg, rising then falling
Visibility: 65 miles
3-hr Precip: 0.00 ins
BHO SA 1455 250 SCT 65 183/70/56/0708/007/ FEW SML CU N AND E-SE 
FEW SC DSNT SE-SW WND 03V10/ 8/804 50008

1 P.M.
Weather: Scattered dense cirrus, thin broken cirrus, few cumulus all
quadrants except NNE-E
Temperature: 72F; Dew Point: 57F; Wind: ENE at 7 kts
Sea-level pressure: 30.06 ins. Hg, falling slightly
Visibility: 65 miles, light distant haze
6-hr Max temp: 72F
6-hr Min temp: 62F
6-hr precip: 0.00 ins.
BHO SA 1755 220 SCT E250 -BKN 65 179/72/57/0607/006/ 
FEW CU ALQDS XCPT NNE-E LGT DSNT HZ/ 8/104 58004 10072 20062

SUMMARY FOR THURSDAY, JUNE 21, 2018

TEMPERATURE (DEGREES F)
MAX.....81   NORMAL.....77
MIN.....62   NORMAL.....59
MEAN....72   NORMAL.....68

DEPARTURE FROM 30-YEAR NORMAL.........................+4
TOTAL DEPARTURE FOR THE MONTH.........................+1 [-0.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............0   DEPARTURE...........-1
TOTAL HEATING UNITS FOR THE MONTH.............62   DEPARTURE...........-3
TOTAL HEATING UNITS FOR THE SEASON..........5909   DEPARTURE.........-459
TOTAL HEATING UNITS LAST SEASON TO DATE.....5724   DIFFERENCE........+185

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............7   DEPARTURE..........+3
TOTAL COOLING UNITS FOR THE MONTH..............60   DEPARTURE..........+1
TOTAL COOLING UNITS FOR THE SEASON............122   DEPARTURE.........+39
TOTAL COOLING UNITS LAST SEASON TO DATE.......149   DEPARTURE.........-27

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................22 E AT  1:49 P.M.
                   AERO.........................18 E AT  3:04 P.M.* 
                   ASOS.........................22 E AT  3:04 P.M.
                   DAVIS........................21 M AT 12:17 P.M.** RMY 21
FASTEST MILE FOR YESTERDAY......................16 E AT  1:48 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................17 E AT  1:51 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..................16 M AT  1:50 P.M.**
AVERAGE WIND SPEED AND DIRECTION...............8.0 ENE
                   ASOS........................8.7
                   DAVIS.......................7.9
* Last of multiple occurrences
**Davis direction malfunctioning 

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..........1.13  DEPARTURE......-2.14
                         ASOS..............1.15  
TOTAL PRECIPITATION FOR THE YEAR..........28.45  DEPARTURE......+2.70
                         ASOS.............30.02

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/009/01            21 S   AERO 21 S   RMY N/A
6/02 79/54/67/+5/T/353/39            26 ENE AERO 25 ENE RMY 27
6/03 59/45/52/-10/0.00/816/90        28 ENE AERO 25 ENE RMY N/A  
6/04 52/45/49/-14/0.82/000/00        29 ENE AERO 26 ENE RMY 29
6/05 64/47/56/-7/0.19/173/19         24 N   AERO 21 N   RMY 23  TSTM  
6/06 66/50/58/-5/0.00/373/41         23 S   AERO 21 S   RMY 22
6/07 69/50/60/-4/0.00/282/31         25 S   AERO 25 S   RMY 27 
6/08 79/52/66/+2/0.00/684/75         20 SW  AERO 17 SW  RMY 18
6/09 79/58/69/+5/0.00/767/84         22 W   AERO 21 W   RMY 22
6/10 72/56/64/-1/0.00/593/65         20 S   AERO 18 S   RMY 17
6/11 68/51/60/-5/0.00/594/65         21 ENE AERO 20 SSW RMY N/A
6/12 77/49/63/-2/0.00/814/89         37 SW  AERO 37 SW  RMY 39
6/13 74/56/65/0/T/284/31             35 SW  AERO 36 SW  RMY 36
6/14 77/61/69/+3/0.00/495/54         35 W   AERO 36 WNW RMY 37
6/15 68/53/61/-5/0.01/266/29         17 NNW AERO 16 WNW RMY 19
6/16 83/54/69/+3/0.00/.../..         25 NNW AERO 24 NNW RMY 25
6/17 86/63/75/+8/0.00/.../..         23 S   AERO 22 S   RMY N/A
6/18 86/64/75/+8/0.10/.../..         37 SSW AERO 37 SSW RMY 40  TSTM
6/19 81/64/73/+6/0.01/.../..         31 WSW AERO 32 WSW RMY 32 
6/20 81/58/70/+2/0.00/.../..         22 W   AERO 21 W   RMY 23 
6/21 81/62/72/+4/0.00/.../..         22 E   AERO 18 E   RMY 21 

6/22 Low temp since midnight is 56F; normal low is now 59F

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

RECORDS FOR JUNE 23
HIGH 93F IN 1888
LOW 45F IN 1885
PRECIP 0.70 INS IN 2006
PEAK GUST 63 MPH SE IN 1972 (AGNES)

TODAY'S REPORT PREPARED BY: Jonathan O'Brien