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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, AUGUST 12, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL TEMPERATURES AFTER OVERNIGHT RAINSTORM

After a few days of seasonable temperatures we had a cool day 
here on top of Great Blue Hill. We had a high of only 71F by 1 P.M.
This is close to 10 degrees cooler than the normal daily temperature. 
An overnight rainstorm left 0.17 inches of precipitation. 
Winds were light and variable, even calm at the 7 A.M. observation.
This morning we had patches of fog in all directions which dissipated
before the 10 A.M. observation. Skies turned overcast by 1 P.M. 

Today's Observations:

7 A.M.
Weather: Patches of fog below summit in all directions, broken 
altostratus, few distant cumulus WSW-W, few altocumulus all directions 
Temperature: 62F; Dew Point: 59F; Wind: calm 0 kts,
Wind speed: Light
Sea-level pressure: 30.00 ins. Hg, falling then rising
Visibility: 45 miles
6-hr Max temp: 66F
6-hr Min temp: 57F
24-hr precip: 0.17 in.
BHO SA 1155 E110 BKN 45 160/62/59/0000/000/ FEW DSNT CU WSW-W 
FEW AC ALQDS PTCHS FG BLO SMT ALQDS WND LGT/ 8/110 55013 
MANUAL 70017 ASOS 70016 10066 20057

10 A.M.
Weather: Broken stratocumulus 
Temperature: 68F; Dew Point: 60F; Wind: SE at 3 kts,
Wind speed: Light
Sea-level pressure: 29.99 ins. Hg, falling, then more slowly
Visibility: 40 miles
BHO SA 1455 E60 BKN 40 155/68/60/E1403/999/ WND LGT AND VRB/ 
8/400 56005 

1 P.M. 
Weather: Overcast stratocumulus 
Temperature: 70F; Dew Point: 63F; Wind: SSW at 3 kts,
Wind speed: Light and variable
Sea-level pressure: 29.95 ins. Hg, falling, then more slowly
Visibility: 45 miles distant fog WSW-WNW
6-hr Max temp: 71F 
6-hr Min temp: 62F
BHO SA 1755 E23 OVC 45 142/70/63/E2003/995/ DSNT FG WSW-WNW WND 
LGT AND VRB/ 8/400 56013 10071 20062 

SUMMARY FOR FRIDAY, AUGUST 11, 2017
 
TEMPERATURE (DEGREES F)
MAX.....82   NORMAL.....80
MIN.....63   NORMAL.....63
MEAN....73   NORMAL.....71

DEPARTURE FROM 30-YEAR NORMAL.........................+2
TOTAL DEPARTURE FOR THE MONTH.........................+1 [-0.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............8   DEPARTURE..........-1
TOTAL COOLING UNITS FOR THE MONTH..............76   DEPARTURE..........-2
TOTAL COOLING UNITS FOR THE SEASON............497   DEPARTURE.........+68
TOTAL COOLING UNITS LAST SEASON TO DATE.......577   DEPARTURE.........-80

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................17  S  AT  7:53 P.M.
                   AERO........................16  S  AT  7:45 P.M.
                   ASOS........................18  S  AT  7:50 P.M.
                   DAVIS.......................16 SSW AT  7:19 P.M. RMY 17
FASTEST MILE FOR YESTERDAY.....................12  S  AT  7:51 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................13  S  AT  7:54 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................10  S  AT  7:20 P.M.
AVERAGE WIND SPEED AND DIRECTION..............7.0 SSW
                   ASOS.......................6.9
                   DAVIS......................5.6 SSW [197 DEG.]
*last of multiple occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.17  DEPARTURE......+0.03
                         ASOS..............0.16
TOTAL PRECIPITATION FOR THE MONTH..........1.39  DEPARTURE......-0.20
                         ASOS..............1.38
TOTAL PRECIPITATION FOR THE YEAR..........36.15  DEPARTURE......+3.57
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings


PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

8/1  87/65/76/+4/0.00/762/88               16 ESE*AERO 16 NNW RMY 16
8/2  86/65/76/+4/1.09/372/43               32 W   AERO 36 W   RMY 34 TSTM
8/3  83/65/74/+2/0.00/552/64               22 S   AERO 23 S   RMY 24
8/4  84/66/75/+3/0.00/697/81               26 S   AERO 30 S   RMY 29
8/5  75/63/69/-3/0.10/060/07               23 NW  AERO 28 NW  RMY 29
8/6  76/57/67/-5/0.00/795/93               30 NW  AERO 32 NW  RMY 31
8/7  76/60/68/-4/..../597/70               28 SSW AERO 28 SSW RMY 29
8/8  74/60/67/-5/..../.../..               17 S   AERO 16 SSE RMY 16
8/9  83/58/71/-1/0.00/.../..               18 S   AERO 18 S   RMY 19 
8/10 86/63/75/+4/0.00/.../..               20 S   AERO 18 S   RMY 20
8/11 82/63/73/+2/0.00/.../..               17 S   AERO 16 S   RMY 17

8/12  Low temp since midnight is 57F; normal low is now 63F


DAILY RECORDS FOR AUGUST

None so far.


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

RECORDS FOR AUGUST 12
HIGH 99F IN 1944
LOW 48F IN 1930
PRECIP 1.89 INCHES IN 1979
PEAK GUST 50 MPH NE IN 1983

RECORDS FOR AUGUST 13
HIGH 98F IN 1944, 2002
LOW 47F IN 1902, 1957
PRECIP 2.92 INCHES IN 1989
PEAK GUST 52 MPH SSE IN 1963

TODAY'S REPORT PREPARED BY: Kaitlin Ann Geagan