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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, SEPTEMBER 13, 2016  
ALL TIMES ARE IN EASTERN STANDARD TIME

HIGH PRESSURE MOVES OFFSHORE, WINDS SHIFT SOUTHWEST

The high pressure system which has brought us such clear weather has 
shifted offshore, shifting the winds southwest and bringing slightly 
warmer and more humid air into the region.  Temperatures had reached
a max. of 80F by the 1:00PM observation, while dew points remained in
the mid-50s for most of the day.  Skies were mostly clear save for 
few diurnal cumulus appearing later in the day.

7 A.M. 
Weather: Clear
Temperature: 60F; Dew Point: 54F; Wind: WSW at 7 kts
Sea-level pressure: 30.23 ins. Hg, rising then steady
Visibility: 70 miles, distant haze
6-hr Max temp: 60F
6-hr Min temp: 57F
24-hr precip: 0.00 in. 
BHO SA 1155 CLR 70 236/60/54/2407/023/ SKC DSNT HZ/ 50005 10060 20057

10 A.M.
Weather: Few cumulus ESE-SW
Temperature: 74F; Dew Point: 54F; Wind: SW at 8 kts
Sea-level pressure: 30.21 ins. Hg, falling, then more quickly
Visibility: 70 miles
BHO SA 1455 CLR 70 230/74/54/2308/021/ FEW CU ESE-SW/ 8/100 58006

1 P.M. 
Weather: Few cumulus ESE-NW
Temperature: 79F; Dew Point: 51F; Wind: SW at 7G19 kts
Sea-level pressure: 30.15 ins. Hg, falling, then less quickly
Visibility: 70 miles
6-hr Max. temp: 80F 
6-hr Min. temp: 59F
BHO SA 1755 CLR 70 209/79/51/2207G19/015/ FEW CU ESE-NW/ 8/100 56021
10080 20059

SUMMARY FOR MONDAY, SEPTEMBER 12, 2016
 
TEMPERATURE (DEGREES F)
MAX.....76   NORMAL.....73
MIN.....53   NORMAL.....56 
MEAN....65   NORMAL.....65

DEPARTURE FROM 30-YEAR NORMAL........................+0
TOTAL DEPARTURE FOR THE MONTH.......................+33 [+2.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE..........-2
TOTAL COOLING UNITS FOR THE MONTH..............51   DEPARTURE.........+14
TOTAL COOLING UNITS FOR THE SEASON............843   DEPARTURE........+269
TOTAL COOLING UNITS LAST SEASON TO DATE.......758   DIFFERENCE........+85 

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............0   DEPARTURE..........-3
TOTAL HEATING UNITS FOR THE MONTH...............0   DEPARTURE.........-22
TOTAL HEATING UNITS FOR THE SEASON.............10   DEPARTURE.........-37
TOTAL HEATING UNITS LAST SEASON TO DATE.........1   DIFFERENCE.........+9   

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................18 SW  AT 11:21 P.M.* 
                   AEROVANE....................13 WNW AT  1:15 P.M. 
                   ASOS........................19 NW  AT  1:14 P.M. 
                   DAVIS.......................18 WNW AT  1:14 P.M. RMY 19 
FASTEST MILE FOR YESTERDAY.....................13 SW  AT 11:47 P.M.      
MAXIMUM 2-MINUTE ASOS AVERAGE..................14 WSW AT 11:48 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.................13 SW  AT 11:19 P.M. 
AVERAGE WIND SPEED AND DIRECTION..............7.5 NW  
                   ASOS.......................7.5
                   DAVIS......................6.5 WNW [290 Deg.]
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.00  DEPARTURE......-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.31  DEPARTURE......-0.17
                         ASOS..............1.30
TOTAL PRECIPITATION FOR THE YEAR..........26.28  DEPARTURE.....-10.22
                         ASOS.............26.57 
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/1  72/64/68/0/0.09/.../..                  21 NNW AERO 16 NNW RMY 20
9/2  76/58/67/-1/0.00/.../..                 23 ENE AERO 17 NE  RMY 23
9/3  71/56/64/-3/0.00/.../..                 16 E   AERO 12 E   RMY N/A
9/4  71/58/65/-2/0.00/.../..                 28 NE  AERO 21 NE  RMY 27
9/5  73/57/65/-2/0.52/.../..                 42 NNE AER0 33 NNE RMY 43  
9/6  70/61/66/-1/0.54/.../..                 32 N   AERO 23 NNE RMY N/A  
9/7  78/66/72/+6/0.05/.../..                 21 NE* AERO 15 NE* RMY 21
9/8  79/65/72/+6/T/.../..                    22 S   AERO 15 S   RMY 23
9/9  90/69/80/+14/T/.../..                   23 W   AERO 24 W   RMY 25  
9/10 82/71/77/+12/T/.../..                   25 S   AERO 18 S   RMY 32
9/11 79/59/69/+4/0.10/.../..                 39 WNW AERO 30 WNW RMY 43
9/12 76/53/65/0/0.00/.../..                  18 SW* AERO 13 WNW RMY 19             

9/13 Low temp since midnight is 57F; normal low is now 56F

DAILY RECORDS FOR SEPTEMBER 2016

9/10/16: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F,
         BREAKS PREVIOUS RECORD OF 69F SET IN 1915, 1931, AND 1989

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

RECORDS FOR SEPTEMBER 13
HIGH 91F IN 1957
LOW 40F IN 1985
PRECIP 3.10 INCHES IN 1987
PEAK GUST 44 MPH WNW IN 1986

RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 4.38 INCHES IN 1944 (Great Atlantic Hurricane in 1944)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944)

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle