Thursday, June 15, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JUNE 15, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

HIGH PRESSURE OVER REGION YIELDS ANOTHER PLEASANT DAY

Today has been another very pleasant day on top of
Great Blue Hill.  Skies have been mostly sunny as
altocumulus entered the region and diurnal cumulus
popped up in the afternoon.  Scattered cirrus have
been present for the entire morning and early after-
noon.

Temperatures have returned to their near-normal levels.
The max. observed at 1:00PM was 75F.  The overnight low
temp. was 54F.  Dew points have remained in the mid 40s
all day and have made for very comfortable conditions
outside.  Visibility was again at 70 miles at each ob.

Today’s Observations:

7 A.M.
Weather: Few altocumulus SSE-W, scattered cirrus, patches of
cirrocumulus W
Temperature: 61F; Dew Point: 44F; Wind: S at 5 kts,
Wind speed: Light
Sea-level pressure: 30.11 ins. Hg, rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 61F
6-hr Min temp: 54F
24-hr precip: 0.00 in.
BHO SA 1155 250 SCT 70 198/61/44/1805/011/ FEW AC SSE-W PTCHS CC W
WND LGT/ 8/039 51011 10061 20054

10 A.M.
Weather: Few altocumulus SSE-W, few cirrus all directions
Temperature: 70F; Dew Point: 44F; Wind: S at 7G12 kts
Sea-level pressure: 30.11 ins. Hg, rising then steady
Visibility: 70 miles
BHO SA 1455 CLR 70 198/70/44/1807G12/011/ FEW AC SSE-W FEW CI ALQDS/
8/031 55000

1 P.M.
Weather: Few cumulus WNW, few altocumulus SW-NW, scattered cirrus,
distant fires SE of observatory
Temperature: 74F; Dew Point: 44F; Wind: S at 14G20 kts
Sea-level pressure: 30.09 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 75F
6-hr Min temp: 61F
BHO SA 1755 250 SCT 70 188/74/44/1914G20/009/ FEW CU WNW FEW AC SW-NW
FIRES SE OF OBSVTRY CAUSING SMK/ 8/131 58010 10075 20061

SUMMARY FOR WEDNESDAY, JUNE 14, 2017

TEMPERATURE (DEGREES F)
MAX…..78   NORMAL…..75
MIN…..56   NORMAL…..57
MEAN….67   NORMAL…..66

DEPARTURE FROM 30-YEAR NORMAL…………………….+1
TOTAL DEPARTURE FOR THE MONTH……………………+13 [+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……….+8
TOTAL HEATING UNITS FOR THE SEASON………..5721   DEPARTURE……..-633
TOTAL HEATING UNITS LAST SEASON TO DATE……5282   DIFFERENCE…….+439

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH…………..55   DEPARTURE………+22
TOTAL COOLING UNITS FOR THE SEASON…………111   DEPARTURE………+54
TOTAL COOLING UNITS LAST SEASON TO DATE……..67   DEPARTURE………+44

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….20  S  AT  9:04 P.M.
AERO……………………20  S  AT  9:23 P.M.
ASOS……………………20  S  AT  9:13 P.M.
DAVIS…………………..17 ENE AT  8:05 A.M. RMY 20
FASTEST MILE FOR YESTERDAY…………………14  S  AT  9:02 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15  S  AT 10:10 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..13  S  AT 10:10 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.0  N
ASOS…………………..8.3
DAVIS………………….6.6 ENE [070 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.17  DEPARTURE……+0.89
ASOS…………..3.23
TOTAL PRECIPITATION FOR THE YEAR……….28.51  DEPARTURE……+3.57
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 78/56/67/+1/0.02/…/..               20 S   AERO 20 S   RMY 20

6/15 Low temp since midnight is 54F; 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 15
HIGH 94F IN 1988
LOW 42F IN 1959, 1978
PRECIP 2.04 INS IN 1903
PEAK GUST 52 MPH SW IN 1972

RECORDS FOR JUNE 16
HIGH 92F IN 1891, 1967
LOW 44F IN 1926
PRECIP 2.17 INS IN 1931
PEAK GUST 55 MPH W IN 1958

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