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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 15, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

AFTERNOON SKIES SEE BREAKS IN CLOUD COVER,
TEMPS REACH 74F BY 1:00PM EST

Overcast conditions continued this morning during the
first two observations.  The stratocumulus and stratus
layers began to break before noon to give us some
sunshine and blue skies.  With the breaks in cloud cover,
temperatures were able to rise to 74F by 1:00PM after an
overnight low of 59F which occurred before midnight last
night.  Winds were very light this morning with near calm
conditions.  They began to pick up in the afternoon, but
the peak gust for the day is still just 10 MPH.  

The high temperature on Friday of 63F was just one degree
warmer than the record low maximum for the date of 62F
set in 1937. 

Today's Observations:

7 A.M.
Weather: Few cumulus in all directions, broken stratocumulus, 
broken stratus
Temperature: 63F; Dew Point: 60F; Wind: estimated SE at 1 kt,
Wind: Light and variable
Sea-level pressure: 29.96 ins. Hg, steady then falling
Visibility: 20 miles, distant fog in all directions
6-hr Max temp: 63F
6-hr Min temp: 60F
24-hr precip: Trace 
BHO SA 1155 E12 BKN E29 BKN 20 146/63/60/E1401/996/ FEW CU ALQDS
DSNT FG ALQDS WND L/V/ 8/600 58003 10063 20060

10 A.M.
Weather: Broken stratocumulus, overcast stratus
Temperature: 67F; Dew Point: 62F; Wind: estimated WNW at 1 kt,
Wind: Light and variable
Sea-level pressure: 29.95 ins. Hg, falling then steady
Visibility: 20 miles, distant fog in all directions
BHO SA 1455 E14 BKN 19 OVC 20 141/67/62/E2901/995/ DSNT FG ALQDS 
WND L/V/ 8/6// 56005

1 P.M. 
Weather: Scattered cumulus, broken stratocumulus
Temperature: 72F; Dew Point: 63F; Wind: W at 3 kts,
Wind: Light and variable
Sea-level pressure: 29.92 ins. Hg, steady then falling
Visibility: 20 miles, distant fog in all directions
6-hr Max temp: 74F
6-hr Min temp: 62F
BHO SA 1755 18 SCT E23 BKN 20 133/72/63/E2703/992/ DSNT FG ALQDS 
WND L/V/ 8/500 58008 10074 20062


SUMMARY FOR FRIDAY, JULY 14, 2017
 
TEMPERATURE (DEGREES F)
MAX.....63   NORMAL.....81
MIN.....56   NORMAL.....63
MEAN....60   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL........................-12
TOTAL DEPARTURE FOR THE MONTH.........................+4 [+0.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE..........-7
TOTAL COOLING UNITS FOR THE MONTH.............101   DEPARTURE..........+8
TOTAL COOLING UNITS FOR THE SEASON............302   DEPARTURE.........+80
TOTAL COOLING UNITS LAST SEASON TO DATE.......245   DEPARTURE.........+57

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................15  E  AT 10:00 A.M.
                   AERO........................14  E  AT 10:00 A.M.
                   ASOS........................15 ENE AT 10:17 A.M.
                   DAVIS.......................13  NE AT  1:26 A.M. RMY 14
FASTEST MILE FOR YESTERDAY.....................10  E  AT  9:59 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................12  E  AT 10:18 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................10 ENE AT 10:17 A.M.
AVERAGE WIND SPEED AND DIRECTION..............5.5 ENE
                   ASOS.......................6.1
                   DAVIS......................4.7 ENE [062 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...Trace  DEPARTURE......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.51  DEPARTURE......-0.15
                         ASOS..............1.48
TOTAL PRECIPITATION FOR THE YEAR..........32.88  DEPARTURE......+4.25
                         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/+0/0.00/664/73               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 TSTM
7/9  81/60/71/-1/0.00/.../..               26 W   AERO 26 W   RMY 26
7/10 85/63/74/+2/T/.../..                  25 SW  AERO 25 S   RMY 26
7/11 82/66/74/+2/0.25/.../..               24 S   AERO 24 S   RMY N/A
7/12 85/68/77/+5/0.43/.../..               23 NE  AERO 22 NE  RMY 23 TSTM
7/13 68/55/62/-10/..../.../..              28 NNE AERO 28 NE  RMY 29
7/14 63/56/60/-12/..../.../..              15 E   AERO 14 E   RMY 14

7/13 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 15
HIGH 94F IN 1995
LOW 50F IN 1929, 1930
PRECIP 1.64 INS IN 1896
WIND 71 MPH WNW IN 2002

RECORDS FOR JULY 16
HIGH 94F IN 1968, 1980, 1983, 1999
LOW 50F IN 1889, 1903
PRECIP 0.97 INS IN 2014
WIND 48e MPH SW 1944

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle