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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JUNE 28, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

STORMY DAY WITH RAIN, HEAVY AT TIMES, AND THUNDER... 

The rain began late yesterday overnight and we measured
0.18 ins by 7:00 A.M. today and an additional 1.04 ins. by 
1:00 P.M. We heard rumbles of thunder intermittently throughout
the day beginning around 8:45 A.M. EST. this morning. The thunder 
was heard again around 9:30 A.M., just before 12:00 P.M. EST and 
then a few more in the afternoon ending at 12:45 P.M. The max 
temperature so far today has been below normal with a high of 70F, 
which is 9 degrees below the daily normal of 79F. Temperatures 
only warmed 2 degrees between 7:00 A.M. and 1:00 P.M., this was 
due to the high humidity and cloud cover keeping temperatures fairly 
constant. Humidity was over 95% 7:00 A.M. all day causing us to be 
socked in the fog atop of Great Blue Hill, with the greatest visibility 
of 10 miles at 10:00 A.M. The wind today was moderate and from the south 
with frequent gusts over 20 kts (23 MPH).


Today's Observations:

7 A.M.
Weather: Light drizzle and fog, overcast nimbostratus
Temperature: 68F; Dew Point: 68F; Wind: S at 11G18 kts
Sea-level pressure: 29.87 ins. Hg, falling, then more slowly
Visibility: 1/2 mile
6-hr Max temp: 68F
6-hr Min temp: 63F
24-hr Precip: 0.18 ins. 
BHO SA 1155 E5 OVC 1/2L-F 116/68/68/1811G18/987/ 8/02/ 56015 
MANUAL 70018 ASOS 70018 10068 20063

10 A.M.
Weather: Light rain, scattered stratus fractus, broken 
stratocumulus, overcast nimbostratus, thunder ending at 
9:15 A.M. EST and beginning at 9:30 A.M. EST ending again 
at 9:50 A.M. then moved NE
Temperature: 69F; Dew Point: 68F; Wind: S at 12G19 kts
Sea-level pressure: 29.84 ins. Hg, falling, then more slowly 
Visibility: 10 miles, except N 5 
3-hr Precip: 0.68 ins. 
BHO SA 1455 9 SCT E36 BKN E110 OVC 10R- 105/69/68/1712G19/984/ 
VSBY 5 N TSE15B30E50 MOVD NE/ 8/52/ 58011 MANUAL 6068/ ASOS 60064   

1 P.M.
Weather: Light rain, scattered stratus fractus, broken 
stratocumulus, overcast nimbostratus, thunder ending at 
12:10 P.M. EST and beginning at 12:15 P.M. EST ending 
again at 12:45 P.M. EST 
Temperature: 69F; Dew Point: 69F; Wind: S at 12G20 kts
Sea-level pressure: 29.80 ins. Hg, falling, then more rapidly
Visibility: 3/4 mile, except WNW 1 mile 
6-hr Max temp: 70F
6-hr Min temp: 68F
6-hr precip: 1.04 ins.
BHO SA 1755 4 SCT E12 BKN E50 OVC 3/4R-F 093/69/69/1712G20/980/ 
VSBY 1 WNW TSE10B15E45/ 8/52/ 58012 MANUAL 6104/ ASOS 60103 
10070 20068

SUMMARY FOR WEDNESDAY, JUNE 27, 2018

TEMPERATURE (DEGREES F)
MAX.....78   NORMAL.....78
MIN.....59   NORMAL.....60
MEAN....69   NORMAL.....69

DEPARTURE FROM 30-YEAR NORMAL..........................0
TOTAL DEPARTURE FOR THE MONTH........................-20 [-0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............0   DEPARTURE...........-1
TOTAL HEATING UNITS FOR THE MONTH.............69   DEPARTURE...........-2
TOTAL HEATING UNITS FOR THE SEASON..........5916   DEPARTURE.........-458
TOTAL HEATING UNITS LAST SEASON TO DATE.....5724   DIFFERENCE........+192

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............4   DEPARTURE..........-1
TOTAL COOLING UNITS FOR THE MONTH..............68   DEPARTURE.........-20
TOTAL COOLING UNITS FOR THE SEASON............130   DEPARTURE.........+18
TOTAL COOLING UNITS LAST SEASON TO DATE.......188   DEPARTURE.........-58

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................26 S   AT 3:13 P.M.
                   AERO.........................28 S   AT 3:13 P.M.
                   ASOS.........................27 SSW AT 3:13 P.M.
                   DAVIS........................28 M   AT 3:12 P.M.** RMY N/A
FASTEST MILE FOR YESTERDAY......................19 S   AT 7:06 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE...................20 S   AT 7:06 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................19 M   AT 3:13 P.M.**
AVERAGE WIND SPEED AND DIRECTION..............13.4 S
                   ASOS.......................13.2
                   DAVIS......................13.1
* Last of multiple occurrences, additional fastest mile S at 3:14 P.M.
**Davis direction malfunctioning 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.18  DEPARTURE......+0.06
                         ASOS..............0.18
TOTAL PRECIPITATION FOR THE MONTH..........1.74  DEPARTURE......-2.24
                         ASOS..............1.75  
TOTAL PRECIPITATION FOR THE YEAR..........29.06  DEPARTURE......+2.60
                         ASOS.............30.62


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/+3/0.00/761/83         25 NNW AERO 24 NNW RMY 25
6/17 86/63/75/+8/0.00/807/88         23 S   AERO 22 S   RMY N/A
6/18 86/64/75/+8/0.10/284/31         37 SSW AERO 37 SSW RMY 40  TSTM
6/19 81/64/73/+6/0.01/789/86         31 WSW AERO 32 WSW RMY 32 
6/20 81/58/70/+2/0.00/459/50         22 W   AERO 21 W   RMY 23 
6/21 81/62/72/+4/0.00/706/77         22 E   AERO 18 E   RMY 21 
6/22 75/56/66/-2/0.00/.../..         24 ESE AERO 22 ESE RMY 24
6/23 65/55/60/-8/0.03/.../..         22 ENE AERO 21 NE  RMY 22 
6/24 78/56/67/-2/..../.../..         21 SSW AERO 20 SSW RMY N/A 
6/25 70/56/63/-6/..../.../..         30 N   AERO 29 N   RMY 31  TSTM
6/26 79/53/66/-3/0.00/.../..         24 SSW AERO 24 SSW RMY 25
6/27 78/59/69/0/..../.../..          26 S   AERO 28 S   RMY N/A

6/28 Low temp since midnight is 63F; normal low is now 61F

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 28
HIGH 95F IN 1991
LOW 47F IN 1970
PRECIP 2.09 INS IN 1938
PEAK GUST 52 MPH WSW IN 1993

RECORDS FOR JUNE 29
HIGH 93F IN 1933
LOW 42F IN 1919
PRECIP 1.60 INS IN 1889
PEAK GUST 49 MPH S IN 1957

TODAY'S REPORT PREPARED BY: Kaitlin A. Geagan