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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JUNE 27, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER COOLER DAY WITH PASSING SHOWERS

Temperatures were slightly cooler again today reaching
72F by 1:00PM EST.  Dew points were slightly higher and
measured in the upper 50s.  The morning low temp. of 60F
is the same as the normal minimum temperature, but the
max. so far today is 6F below average.

Passing rain showers before the 10:00AM and 1:00PM obs.
left traces of precip.  Towering cumulus were spotted to
the south during the 10:00AM ob.  Distant showers and
fog dropped visibility to 40-50 miles by early afternoon.


Today's Observations:

7 A.M.
Weather: Few cumulus SSE, broken altocumulus
Temperature: 65F; Dew Point: 57F; Wind: S at 5 kts,
Wind speed: Light
Sea-level pressure: 30.02 ins. Hg, rising then falling
Visibility: 70 miles, distant fog SE-NNE
6-hr Max temp: 65F
6-hr Min temp: 60F
24-hr precip: 0.00 in.
BHO SA 1155 E120 BKN 70 165/65/57/1805/002/ FEW CU SSE DSNT FG 
SE-NNE WND LGT/ 8/130 50000 10065 20060

10 A.M.
Weather: Few cumulus E-SSW, towering cumulus SSE and S, overcast
altocumulus, distant showers SSW
Temperature: 63F; Dew Point: 56F; Wind: W at 7 kts
Sea-level pressure: 30.03 ins. Hg, rising then steady
Visibility: 70 miles, except 50 miles SSe-SSW
3-hr precip: Trace
BHO SA 1455 E110 OVC 70 168/63/56/2707/003/ FEW CU E-SSW TCU SSE 
AND S VSBY SSE-SSW 50 R-B15E55 DSNT SHWRS SSW/ 8/23/ 53003 MANUAL 
6000/

1 P.M. 
Weather: Few cumulus SE-SSW, scattered altocumulus, broken 
altocumulus, broken altostratus
Temperature: 72F; Dew Point: 55F; Wind: S at 9G16 kts
Sea-level pressure: 29.97 ins. Hg, falling, then more slowly
Visibility: 50 miles, except 40 miles W-NW, distant fog W-NW
6-hr Max temp: 72F
6-hr Min temp: 63F
6-hr precip: Trace
BHO SA 1755 84 SCT E140 BKN 200 BKN 50 149/72/55/1809G16/997/ 
FEW CU SE-SSW DSNT FG W-NW VSBY W-NW 40 RW-B30E40/ 8/110 56019 
MANUAL 6000/ 10072 20063

SUMMARY FOR MONDAY, JUNE 26, 2017
 
TEMPERATURE (DEGREES F)
MAX.....79   NORMAL.....78
MIN.....57   NORMAL.....60
MEAN....68   NORMAL.....69

DEPARTURE FROM 30-YEAR NORMAL.........................-1
TOTAL DEPARTURE FOR THE MONTH........................+55 [+1.9 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..........-8
TOTAL HEATING UNITS FOR THE SEASON...........5724   DEPARTURE........-649
TOTAL HEATING UNITS LAST SEASON TO DATE......5282   DIFFERENCE.......+442

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............3   DEPARTURE..........-2
TOTAL COOLING UNITS FOR THE MONTH.............132   DEPARTURE.........+50
TOTAL COOLING UNITS FOR THE SEASON............188   DEPARTURE.........+82
TOTAL COOLING UNITS LAST SEASON TO DATE.......122   DEPARTURE.........+66

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................24  W  AT 9:03 A.M.
                   AERO........................24  W  AT 9:03 A.M.
                   ASOS........................25  W  AT 9:03 A.M.
                   DAVIS.......................23  W  AT 9:02 A.M. RMY 23
FASTEST MILE FOR YESTERDAY.....................17 SSW AT 6:56 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................18  W  AT 9:03 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................17  W  AT 9:04 A.M.
AVERAGE WIND SPEED AND DIRECTION.............10.3  W
                   ASOS......................10.2
                   DAVIS......................9.0  W [264 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.12
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........5.81  DEPARTURE......+1.95
                         ASOS..............5.88
TOTAL PRECIPITATION FOR THE YEAR..........31.15  DEPARTURE......+4.63
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings


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

6/1  78/55/67/+5/0.06/706/78               39 NW  AERO 39 NW  RMY 41
6/2  70/50/60/-2/T/652/72                  32 WNW AERO 35 WNW RMY 34
6/3  66/47/57/-5/0.01/472/52               23 NW  AERO 25 NW  RMY 24
6/4  71/49/60/-3/0.28/490/54               21 SSE*AERO 21 SW  RMY N/A
6/5  55/49/52/-11/1.20/000/00              32 NE  AERO 35 NE  RMY N/A
6/6  49/45/47/-16/1.36/000/00              40 ENE AERO 43 ENE RMY 43
6/7  65/47/56/-8/0.05/519/57               21 NNE AERO 18 NE* RMY 20
6/8  76/52/64/0/0.00/602/66                21 SSE AERO 21 SSE RMY 18
6/9  78/53/66/+2/0.16/438/48               48 N   AERO 54 N   RMY 52 TSTM
6/10 83/59/71/+6/0.00/722/79               25 SSW AERO 28 SSW RMY 27  
6/11 89/64/77/+12/0.00/704/77              29 SW  AERO 32 WSW RMY 30
6/12 94/69/82/+17/0.00/851/93              28 W   AERO 29 W   RMY 28
6/13 92/67/80/+15/0.03/796/87              25 W   AERO 28 WNW RMY 28
6/14 78/56/67/+1/0.02/889/97               20 S   AERO 20 S   RMY 20
6/15 75/54/65/-1/0.00/870/95               25 SSW AERO 29 S   RMY 30
6/16 70/56/63/-3/2.14/073/08               28 S   AERO 29 S   RMY N/A
6/17 70/58/64/-3/0.01/000/00               18 S   AERO 18 S   RMY N/A
6/18 82/65/74/+7/T/394/43                  33 SSW*AERO 35 SSW RMY 37
6/19 82/67/75/+8/0.05/312/34               40 S   AERO 43 S   RMY 43
6/20 84/66/75/+7/0.25/651/71               38 SW  AERO 44 SW  RMY 40
6/21 83/64/74/+6/0.00/734/80               29 W   AERO 30 W   RMY 30
6/22 83/59/71/+3/0.00/779/85               23 W   AERO 22 W   RMY 21 
6/23 88/66/77/+9/0.00/.../..               33 S   AERO 36 S   RMY 36
6/24 84/68/76/+7/0.19/.../..               28 WNW AERO 31 WNW RMY 32
6/25 83/61/72/+3/T/.../..                  29 WNW AERO 35 WNW RMY 34
6/26 79/57/68/-1/0.00/.../..               24 W   AERO 24 W   RMY 23

6/27 Low temp since midnight is 60F; normal low is now 60F


DAILY RECORDS FOR JUNE

6/12/17: DAILY RECORD MAXIMUM TEMPERATURE OF 94F,
         BREAKS PREVIOUS RECORD OF 92F SET IN 1973

6/12/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 69F,
         TIES PREVIOUS RECORD SET IN 1942

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

RECORDS FOR JUNE 27
HIGH 93F IN 1999, 2007
LOW 46F IN 1897
PRECIP 1.72 INS IN 1938
PEAK GUST 55e N IN 1945

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

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle