Monday, June 26, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JUNE 26, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

EVENING SHOWERS LEAVE TRACE OF PRECIP,
TODAY SEES COOLER TEMPS.

Two rounds of passing showers left just traces of precip.
at BHO yesterday afternoon and evening.  Light rain fell
between 3:00PM and 4:00PM EST followed by a quick shower
which ended just before 6:00PM.  Skies cleared shortly
after and remained clear through the evening and morning.
Diurnal cumulus had appeared by this afternoon making for
partly cloudy conditions.

Temperatures have been slightly cooler than the previous
days but still within normal levels.  The max. by 1:00PM
was 76F compared to the maximums for the past week of 80F
or higher.  The minimum this morning of 57F has also been
the lowest temperature at BHO for the past week and a half.

Today’s Observations:

7 A.M.
Weather: Few distant cumulus NW
Temperature: 64F; Dew Point: 51F; Wind: W at 7 kts
Sea-level pressure: 29.99 ins. Hg, rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 64F
6-hr Min temp: 57F
24-hr precip: Trace
BHO SA 1155 CLR 70 157/64/51/2807/999/ FEW DSNT CU NW/
8/100 51016 10064 20057

10 A.M.
Weather: Few cumulus in all directions
Temperature: 73F; Dew Point: 53F; Wind: W at 7 kts
Sea-level pressure: 30.00 ins. Hg, rising then steady
Visibility: 70 miles
BHO SA 1455 CLR 70 160/73/53/2707/000/ FEW CU AQLDS/ 8/100 52003

1 P.M.
Weather: Scattered cumulus
Temperature: 74F; Dew Point: 50F; Wind: W at 8G18 kts
Sea-level pressure: 29.98 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 76F
6-hr Min temp: 64F
BHO SA 1755 54 SCT 70 153/74/50/2708G18/998/ 8/100 58007 10076 20064

SUMMARY FOR SUNDAY, JUNE 25, 2017

TEMPERATURE (DEGREES F)
MAX…..83   NORMAL…..78
MIN…..61   NORMAL…..60
MEAN….72   NORMAL…..69

DEPARTURE FROM 30-YEAR NORMAL…………………….+3
TOTAL DEPARTURE FOR THE MONTH……………………+56 [+2.0 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……..-648
TOTAL HEATING UNITS LAST SEASON TO DATE……5282   DIFFERENCE…….+442

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………7   DEPARTURE……….+2
TOTAL COOLING UNITS FOR THE MONTH………….129   DEPARTURE………+52
TOTAL COOLING UNITS FOR THE SEASON…………185   DEPARTURE………+84
TOTAL COOLING UNITS LAST SEASON TO DATE…….114   DEPARTURE………+71

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….29 WNW AT 8:58 P.M.
AERO……………………35 WNW AT 8:58 P.M.
ASOS……………………30 WNW AT 8:58 P.M.
DAVIS…………………..32 WNW AT 8:57 P.M. RMY 34
FASTEST MILE FOR YESTERDAY…………………22 WNW AT 8:57 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………21 SSW AT 5:15 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20 WNW AT 8:59 P.M.
AVERAGE WIND SPEED AND DIRECTION………….10.4  W
ASOS………………….10.3
DAVIS………………….9.1  W [266 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…TRACE  DEPARTURE……-0.12
ASOS…………..0.100
TOTAL PRECIPITATION FOR THE MONTH……….5.81  DEPARTURE……+2.01
ASOS…………..5.88
TOTAL PRECIPITATION FOR THE YEAR……….31.15  DEPARTURE……+4.75
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 Low temp since midnight is 57F; 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 26
HIGH 96F IN 1952
LOW 45F IN 1986
PRECIP 1.52 INS IN 1945
PEAK GUST 48 MPH N IN 1998

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

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle