Wednesday, June 21, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JUNE 21, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

PARTLY SUNNY DAY WITH INCREASING AFTERNOON WINDS

Skies have remained partly sunny all day with a mixture
of different cloud types.  Altocumulus clouds dissipated
by the afternoon while cumulus began to form in late
morning.  A combination of cirrus and cirrocumulus clouds
have been present throughout the day.

Temperatures reached the low 80s again today, but dew points
have been lower making for much more pleasant conditions.
Winds began to pick up in the afternoon with gusts up to 30 MPH.
Visibility was 60-70 miles during each observation.

Today’s Observations:

7 A.M.
Weather: Few altocumulus in all directions, broken cirrus, patches
of cirrocumulus overhead
Temperature: 71F; Dew Point: 58F; Wind: SW at 10 kts
Sea-level pressure: 29.89 ins. Hg, rising then falling
Visibility: 60 miles
6-hr Max temp: 71F
6-hr Min temp: 64F
24-hr precip: 0.00 in.
BHO SA 1155 E250 BKN 60 123/71/58/2310/989/ FEW AC ALQDS
PTCHS CC OVHD/ 8/099 58004 10071 20064

10 A.M.
Weather: Few cumulus in all directions, broken altocumulus, broken cirrus
Temperature: 80F; Dew Point: 55F; Wind: SW at 11G20 kts
Sea-level pressure: 29.86 ins. Hg, falling, then more quickly
Visibility: 60 miles
BHO SA 1455 E120 BKN 250 BKN 60 113/80/55/2311G20/986/ FEW CU ALQDS/
8/132 58010

1 P.M.
Weather: Scattered cumulus, scattered cirrocumulus
Temperature: 82F; Dew Point: 54F; Wind: WSW at 13G22 kts
Sea-level pressure: 29.82 ins. Hg, falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 82F
6-hr Min temp: 71F
BHO SA 1755 54 SCT 250 SCT 70 098/82/54/2513G22/982/ PK WND 2726/58
WND 21V29/ 8/109 56015 10082 20071

SUMMARY FOR TUESDAY, JUNE 20, 2017

TEMPERATURE (DEGREES F)
MAX…..84   NORMAL…..76
MIN…..66   NORMAL…..59
MEAN….75   NORMAL…..68

DEPARTURE FROM 30-YEAR NORMAL…………………….+7
TOTAL DEPARTURE FOR THE MONTH……………………+28 [+1.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE MONTH…………..62   DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE SEASON………..5724   DEPARTURE……..-642
TOTAL HEATING UNITS LAST SEASON TO DATE……5282   DIFFERENCE…….+442

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..10   DEPARTURE……….+6
TOTAL COOLING UNITS FOR THE MONTH…………..84   DEPARTURE………+29
TOTAL COOLING UNITS FOR THE SEASON…………140   DEPARTURE………+61
TOTAL COOLING UNITS LAST SEASON TO DATE……..90   DEPARTURE………+50

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….38 SW  AT 4:08 P.M.
AERO……………………44 SW  AT 4:09 P.M.
ASOS……………………40 SW  AT 4:09 P.M.
DAVIS…………………..38 WSW AT 4:09 P.M. RMY 40
FASTEST MILE FOR YESTERDAY…………………30 SW  AT 4:09 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………30 SW  AT 4:09 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..28 SW  AT 4:09 P.M.
AVERAGE WIND SPEED AND DIRECTION………….15.0 SW
ASOS………………….14.8
DAVIS…………………13.5 SW [223 DEG.]

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……….5.62  DEPARTURE……+2.48
ASOS…………..5.69
TOTAL PRECIPITATION FOR THE YEAR……….30.96  DEPARTURE……+5.16
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/…/..              25 W   AERO 28 WNW RMY 28
6/14 78/56/67/+1/0.02/…/..               20 S   AERO 20 S   RMY 20
6/15 75/54/65/-1/0.00/…/..               25 SSW AERO 29 S   RMY 30
6/16 70/56/63/-3/2.14/…/..               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/…/..                  33 SSW*AERO 35 SSW RMY 37
6/19 82/67/75/+8/…./…/..               40 S   AERO 43 S   RMY 43
6/20 84/66/75/+7/…./…/..               38 SW  AERO 44 SW  RMY 40

6/21 Low temp since midnight is 64F; normal low is now 59F

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 21
HIGH 94F IN 2012
LOW 42F IN 1940
PRECIP 1.40 INS 1903
PEAK GUST 51 MPH SSW IN 2000

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

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle and Nick Rousseau