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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JULY 9, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

MOSTLY SUNNY SKIES RETURN TO BLUE HILL
AFTER ROUND OF EVENING THUNDERSTORMS

Winds were gusting 29 MPH yesterday evening during passing
thunderstorms which left 0.15 inches of rain.  The peak
gust for the day of 30 MPH occurred shortly past 2:00PM EST
when storms were passing north of Boston and we could only
discern distant lightning.  Precip. now measures 0.78 inches
for the month, which is below normal by a tenth of an inch
but is still above normal by 4.30 inches for the year.

Skies soon cleared after the storms dissipated and have
remained mostly sunny through the early afternoon.  Morning
skies had few altocumulus, and scattered cumulus had formed
by the 1:00PM ob.  Visibility was at 70 miles despite some
lingering fog in the morning.  Temperatures have been near-
normal today with a max. of 79F by 1:00PM.


Today's Observations:

7 A.M.
Weather: Few altocumulus ENE-S and NW-N
Temperature: 65F; Dew Point: 61F; Wind: W at 7 kts
Sea-level pressure: 29.93 ins. Hg, rising, then more quickly
Visibility: 70 miles, distant fog in all directions
6-hr Max temp: 65F
6-hr Min temp: 60F
24-hr precip: 0.15 inches 
BHO SA 1155 CLR 70 135/65/61/2807/993/ FEW AC ENE-S AND NW-N
DSNT FG ALQDS/ 8/030 53028 MANUAL 70015 ASOS 70014 10065 20060

10 A.M.
Weather: Few cumulus in all directions, few distant altocumulus NNW-N
Temperature: 74F; Dew Point: 53F; Wind: WNW at 9G16 kts
Sea-level pressure: 29.96 ins. Hg, rising, then more slowly
Visibility: 70 miles
BHO SA 1455 CLR 70 145/74/53/3009G16/996/ FEW CU ALQDS
FEW AC DSNT NNW-N/ 8/130 51010

1 P.M. 
Weather: Scattered cumulus
Temperature: 76F; Dew Point: 52F; Wind: W at 8G16 kts
Sea-level pressure: 29.97 ins. Hg, rising then steady
Visibility: 70 miles
6-hr Max temp: 79F
6-hr Min temp: 65F
BHO SA 1755 39 SCT 70 148/76/52/2808G16/997/ 8/100 51003 10079 20065


SUMMARY FOR SATURDAY, JULY 8, 2017
 
TEMPERATURE (DEGREES F)
MAX.....84   NORMAL.....80
MIN.....61   NORMAL.....63
MEAN....73   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.........................+1
TOTAL DEPARTURE FOR THE MONTH........................+18 [+2.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............8   DEPARTURE..........+1
TOTAL COOLING UNITS FOR THE MONTH..............65   DEPARTURE.........+14
TOTAL COOLING UNITS FOR THE SEASON............266   DEPARTURE.........+86
TOTAL COOLING UNITS LAST SEASON TO DATE.......213   DEPARTURE.........+53

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................30 SW  AT  2:05 P.M.*
                   AERO........................32 SSW AT  1:38 P.M.
                   ASOS........................33 SW  AT  2:05 P.M.
                   DAVIS.......................33 SSW AT  1:39 P.M. RMY 33
FASTEST MILE FOR YESTERDAY.....................23  W  AT  6:35 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE..................23  W  AT  6:36 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................24 SSW AT  2:00 P.M.
AVERAGE WIND SPEED AND DIRECTION.............10.3 SSW
                   ASOS......................11.2
                   DAVIS......................9.0 WSW [236 DEG.]
*last of multiple occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.15  DEPARTURE......+0.03
                         ASOS..............0.14
TOTAL PRECIPITATION FOR THE MONTH..........0.78  DEPARTURE......-0.10
                         ASOS..............0.76
TOTAL PRECIPITATION FOR THE YEAR..........32.15  DEPARTURE......+4.30
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings


PRELIMINARY CLIMATE SUMMARY FOR JULY 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

7/1  85/67/76/+6/T/439/48                  35 S   AERO 37 S   RMY 38
7/2  87/69/78/+8/T/785/86                  25 W*  AERO 28 W*  RMY 27
7/3  85/67/76/+5/0.00/894/98               28 W*  AERO 29 W   RMY 30
7/4  84/62/73/+2/0.00/783/86               17 W   AERO 17 W   RMY 18
7/5  82/62/72/+1/0.00/855/94               20 S   AERO 20 ENE RMY 20
7/6  82/60/71/+6/0.00/664/73               21 SSW AERO 22 SSW RMY 21
7/7  71/60/66/-5/0.63/000/00               28 ENE AERO 28 ENE RMY 27
7/8  84/61/73/+1/0.15/.../..               30 SW* AERO 32 SSW RMY 33

7/9 Low temp since midnight is 60F; normal low is now 63F


DAILY RECORDS FOR JULY

None so far.


DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):      

RECORDS FOR JULY 9
HIGH 98F IN 1912
LOW 47F IN 1909
PRECIP 3.74 INS IN 1921
WIND 46 MPH NW IN 1992 

RECORDS FOR JULY 10
HIGH 99F IN 1911
LOW 46F IN 1890
PRECIP 1.95 INS IN 2015
WIND 75 MPH W IN 1985

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle