Wednesday, June 14, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JUNE 14, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

COOLER TEMPS AND LESS HUMID CONDITIONS WITH HIGH PRESSURE

Temperatures quickly dropped as the cold front passed last
evening reaching a daily minimum of 67F at midnight. The
maximum temperature for yesterday was just shy of tying the
daily record of 93F.  Temps continued to fall to a morning
low of 64F which is still 7F above normal.  Rain between
10:00PM EST and 1:00AM EST left 0.05 inches.

High pressure has been building from the north and has given
us much more pleasant weather.  Dew points fell to the upper
40s and low 50s today.  Visibility was back to 70 miles, and
skies have been partly sunny with cirrus.

Today’s Observations:

7 A.M.
Weather: Few altocumulus SE-WSW, scattered cirrus
Temperature: 69F; Dew Point: 55F; Wind: N at 5 kts,
Wind speed: Light
Sea-level pressure: 30.00 ins. Hg, rising, then more quickly
Visibility: 70 miles
6-hr Max temp: 69F
6-hr Min temp: 64F
24-hr precip: 0.05 in.
BHO SA 1155 250 SCT 70 158/69/55/0105/000/ FEW AC SE-WSW WND LGT/
8/081 53025 MANUAL 70005 ASOS 70003 10069 20064

10 A.M.
Weather: Few altocumulus standing lenticularis S-SE, scattered cirrus
Temperature: 72F; Dew Point: 44F; Wind: E at 8 kts
Sea-level pressure: 30.02 ins. Hg, rising, then more slowly
Visibility: 70 miles
BHO SA 1455 250 SCT 70 165/72/44/0908/002/ FEW ACSL S-SE/ 8/041 51007

1 P.M.
Weather: Few cumulus SSW, broken cirrus
Temperature: 77F; Dew Point: 50F; Wind: N at 6 kts,
Wind: Light and variable
Sea-level pressure: 29.98 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 77F
6-hr Min temp: 69F
BHO SA 1755 E250 BKN 154/77/50/0106/998/ FEW CU SSW WND L/V/ 8/101
58011 10077 20069

SUMMARY FOR TUESDAY, JUNE 13, 2017

TEMPERATURE (DEGREES F)
MAX…..92   NORMAL…..74
MIN…..67   NORMAL…..56
MEAN….80   NORMAL…..65

DEPARTURE FROM 30-YEAR NORMAL……………………+15
TOTAL DEPARTURE FOR THE MONTH……………………+12 [+0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-3
TOTAL HEATING UNITS FOR THE MONTH…………..59   DEPARTURE………+10
TOTAL HEATING UNITS FOR THE SEASON………..5721   DEPARTURE……..-630
TOTAL HEATING UNITS LAST SEASON TO DATE……5281   DIFFERENCE…….+440

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..15   DEPARTURE………+12
TOTAL COOLING UNITS FOR THE MONTH…………..53   DEPARTURE………+23
TOTAL COOLING UNITS FOR THE SEASON…………109   DEPARTURE………+55
TOTAL COOLING UNITS LAST SEASON TO DATE……..67   DEPARTURE………+42

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….25  W  AT  1:59 P.M.
AERO……………………28 WNW AT  1:15 P.M.
ASOS……………………28 WNW AT 12:30 P.M.
DAVIS…………………..26  W  AT  1:14 P.M. RMY 28
FASTEST MILE FOR YESTERDAY…………………20  W  AT  1:58 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………21  W  AT  2:00 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20  W  AT  2:00 P.M.
AVERAGE WIND SPEED AND DIRECTION………….11.9  W
ASOS………………….12.0
DAVIS…………………10.5 WNW [285 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.05  DEPARTURE……-0.11
ASOS…………..0.03
TOTAL PRECIPITATION FOR THE MONTH……….3.17  DEPARTURE……+1.04
ASOS…………..3.23
TOTAL PRECIPITATION FOR THE YEAR……….28.51  DEPARTURE……+3.72
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/…/..                21 SSE AERO 21 SSE RMY 18
6/9  78/53/66/+2/0.16/…/..               48 N   AERO 54 N   RMY 52 TSTM
6/10 83/59/71/+6/0.00/…/..               25 SSW AERO 28 SSW RMY 27
6/11 89/64/77/+12/0.00/…/..              29 SW  AERO 32 WSW RMY 30
6/12 94/69/82/+17/0.00/…/..              28 W   AERO 29 W   RMY 28
6/13 92/67/80/+15/0.03/…/..              25 W   AERO 28 WNW RMY 28

6/14 Low temp since midnight is 64F; normal low is now 57F

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 14
HIGH 93F IN 1956
LOW 41F IN 1912
PRECIP 1.49 INS 1896
PEAK GUST 55 MPH WNW IN 1958

RECORDS FOR JUNE 15
HIGH 94F IN 1988
LOW 42F IN 1959, 1978
PRECIP 2.04 INS IN 1903
PEAK GUST 52 MPH SW IN 1972

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle/Nicholas Rousseau