Tuesday, June 20, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JUNE 20, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

HEAVY MORNING RAIN, HUMIDITY DECREASES
FIRST RIPE BLUEBERRY OF THE YEAR

Light rain last evening and heavy rain early this morning
totaled 0.30 inches at 7:00AM EST.  With the passing of
the cold front, dew points began to fall, and visibility
began to improve.  Dew points fell from the upper 60s to
the much more comfortable low 60s by 1:00PM.  Visibility
reached 70 miles in most directions by early afternoon.

The first ripe blueberry of the season was observed today.
It occurs very close to the long-term average date of
June 21 and 13 days later than last year’s first ripe
blueberry.

Today’s Observations:

7 A.M.
Weather: Broken stratus fractus, overcast altostratus, patches of fog
drifting below summit
Temperature: 68F; Dew Point: 67F; Wind: SSW at 10 kts
Sea-level pressure: 29.87 ins. Hg, rising, then more slowly
Visibility: 20 miles, distant fog in all directions
6-hr Max temp: 68F
6-hr Min temp: 67F
24-hr precip: 0.30 in.
BHO SA 1155 E12 BKN 110 OVC 20 114/68/67/2010/987/ PTCHS FG DRFTNG
BLO SMT DSNT FG ALQDS/ 8/72/ 51007 MANUAL 70030 ASOS 70031 10068 20067

10 A.M.
Weather: Scattered cumulus, scattered cirrostratus
Temperature: 76F; Dew Point: 67F; Wind: SSW at 11G19 kts
Sea-level pressure: 29.86 ins. Hg, rising then falling
Visibility: 40 miles, distant haze
BHO SA 1455 19 SCT 200 SCT 40 112/76/67/2111G19/986/ DSNT HZ ALQDS/
8/105 58002

1 P.M.
Weather: Scattered cumulus, scattered cirrostratus
Temperature: 80F; Dew Point: 60F; Wind: SW at 11G19 kts
Sea-level pressure: 29.84 ins. Hg, falling unsteadily
Visibility: 70 miles
6-hr Max temp: 82F
6-hr Min temp: 68F
BHO SA 1755 49 SCT 250 SCT 70 105/80/60/2213G21/984/ VSBY NE-S 50/
8/105 58007 10082 20068

SUMMARY FOR MONDAY, JUNE 19, 2017

TEMPERATURE (DEGREES F)
MAX…..82   NORMAL…..76
MIN…..67   NORMAL…..58
MEAN….75   NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL…………………….+8
TOTAL DEPARTURE FOR THE MONTH……………………+21 [+0.9 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………..0
TOTAL HEATING UNITS FOR THE SEASON………..5724   DEPARTURE……..-641
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…………..74   DEPARTURE………+23
TOTAL COOLING UNITS FOR THE SEASON…………130   DEPARTURE………+55
TOTAL COOLING UNITS LAST SEASON TO DATE……..86   DEPARTURE………+44

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….40  S  AT 1:37 P.M.
AERO……………………43  S  AT 1:49 P.M.
ASOS……………………42  S  AT 1:37 P.M.
DAVIS…………………..42 SSW AT 2:24 P.M. RMY 43
FASTEST MILE FOR YESTERDAY…………………30  S  AT 1:32 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………30  S  AT 1:38 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..28 SSW AT 2:25 P.M.
AVERAGE WIND SPEED AND DIRECTION………….18.2  S
ASOS………………….17.3
DAVIS…………………15.4 SSW [195 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.30  DEPARTURE……+0.15
ASOS…………..0.31
TOTAL PRECIPITATION FOR THE MONTH……….5.62  DEPARTURE……+2.61
ASOS…………..5.69
TOTAL PRECIPITATION FOR THE YEAR……….30.96  DEPARTURE……+5.29
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 Low temp since midnight is 67F; 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 20
HIGH 94F IN 1953
LOW 41F IN 1918
PRECIP 2.62 INS 1945
PEAK GUST 63 MPH NE IN 1967, SSW IN 2010

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

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