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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, SEPTEMBER 19, 2016  
ALL TIMES ARE IN EASTERN STANDARD TIME

SHOWERS BRING 0.08 IN OF PRECIP BY 1:00PM EST

Light rain showers hit Blue Hill shortly before 10:00AM EST and continued
through the 1:00PM observation.  Precipitation totaled 0.08 in. by 1:00PM with 
more expected this afternoon and early evening.  Distant fog moved in by
the 1:00PM ob. limiting visibility to just 1/8 mile.  Temperatures remained
fairly constant throughout the day reaching a maximum of 73F by 1:00PM,
only 4F above the overnight low of 69F.

7 A.M. 
Weather: Scattered stratus, broken stratocumulus, few altocumulus W,
broken altostratus
Temperature: 71F; Dew Point: 69F; Wind: SSE at 4 kts,
Wind Speed: Light
Sea-level pressure: 30.05 ins. Hg, rising then falling 
Visibility: 15 miles, distant fog
6-hr Max temp: 71F
6-hr Min temp: 69F
24-hr precip: Trace
BHO SA 1155 9 SCT E41 BKN 100 BKN 15 177/71/69/1604/005/ FEW AC W DSNT FG
WND LGT/ 8/510 50007 ASOS 70001 10071 20069

10 A.M.
Weather: Light rain, broken stratus, overcast nimbostratus 
Temperature: 73F; Dew Point: 70F; Wind: SSE at 8 kts
Sea-level pressure: 30.05 ins. Hg, rising then falling
Visibility: 10 miles, distant fog
3-hr precip: Trace
BHO SA 1455 E14 BKN 84 OVC 10R- 177/73/70/1508/005/ DSNT FG/ 8/62/ 58000
MANUAL 600//

1 P.M. 
Weather: Light rain, fog
Temperature: 71F; Dew Point: 70F; Wind: S at 6 kts,
Wind Speed: Light
Sea-level pressure: 30.06 ins. Hg, rising then falling
Visibility: 1/8 mile
6-hr Max. temp: 73F 
6-hr Min. temp: 60F
6-hr precip: 0.08 in.
BHO SA 1755 W3 X 1/8R-F 178/71/70/1706/006/ WND LGT/ 8//// 50001 MANUAL 6008/
ASOS 60007 10073 20070

SUMMARY FOR SUNDAY, SEPTEMBER 18, 2016
 
TEMPERATURE (DEGREES F)
MAX.....79   NORMAL.....71
MIN.....63   NORMAL.....54 
MEAN....71   NORMAL.....62

DEPARTURE FROM 30-YEAR NORMAL........................+9
TOTAL DEPARTURE FOR THE MONTH.......................+48 [+3.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............6   DEPARTURE..........+4
TOTAL COOLING UNITS FOR THE MONTH..............70   DEPARTURE.........+22
TOTAL COOLING UNITS FOR THE SEASON............862   DEPARTURE........+277
TOTAL COOLING UNITS LAST SEASON TO DATE.......791   DIFFERENCE........+71 

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............0   DEPARTURE..........-4
TOTAL HEATING UNITS FOR THE MONTH...............6   DEPARTURE.........-37
TOTAL HEATING UNITS FOR THE SEASON.............16   DEPARTURE.........-52
TOTAL HEATING UNITS LAST SEASON TO DATE.........6   DIFFERENCE........+10

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................30 SW  AT  8:42 A.M.*   
                   ASOS........................31 SW  AT  8:42 A.M.  
                   DAVIS.......................31 SSW AT  9:48 A.M. RMY 33 
FASTEST MILE FOR YESTERDAY.....................23 SSW AT  5:08 A.M.     
MAXIMUM 2-MINUTE ASOS AVERAGE..................24 SW  AT 12:56 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE.................22 SSW AT 12:56 P.M.  
 AVERAGE WIND SPEED AND DIRECTION............14.8 S  
                   ASOS......................15.0
                   DAVIS.....................13.7 SSW [200 Deg.]
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...TRACE  DEPARTURE......-0.14
                         ASOS..............0.01
TOTAL PRECIPITATION FOR THE MONTH..........1.31  DEPARTURE......-0.99
                         ASOS..............1.31
TOTAL PRECIPITATION FOR THE YEAR..........26.28  DEPARTURE.....-11.04
                         ASOS.............26.58 
 
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
M:    Missing data

9/1  72/64/68/0/0.09/000/00                  21 NNW AERO 16 NNW RMY 20
9/2  76/58/67/-1/0.00/738/94                 23 ENE AERO 17 NE  RMY 23
9/3  72/56/64/-3/0.00/368/47                 16 E   AERO 12 E   RMY N/A
9/4  71/58/65/-2/0.00/740/95                 28 NE  AERO 21 NE  RMY 27
9/5  73/57/65/-2/0.52/241/31                 42 NNE AER0 33 NNE RMY 43  
9/6  70/61/66/-1/0.54/046/06                 32 N   AERO 23 NNE RMY N/A  
9/7  78/66/72/+6/0.05/339/44                 21 NE* AERO 15 NE* RMY 21
9/8  79/65/72/+6/T/276/36                    22 S   AERO 15 S   RMY 23
9/9  90/69/80/+14/T/421/55                   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 81/57/69/0/0.00/.../..                  25 SSW AERO  M     RMY 26
9/14 87/58/73/+5/T/.../..                    35 NNW AERO  M     RMY 35
9/15 67/52/60/+9/0.00/.../..                 21 NE  AERO  M     RMY 20
9/16 74/54/64/+1/0.00/.../..                 23 SSE AERO  M     RMY 24   
9/17 77/54/66/+3/0.00/.../..                 28 S   AERO  M     RMY 28
9/18 79/63/71/+9/T/.../..                    30 SW  AERO  M     RMY 33

9/19 Low temp since midnight is 69F; normal low is now 54F

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 19
HIGH 87F IN 1906,1983
LOW 37F IN 1929
PRECIP 3.69 INCHES IN 1936
PEAK GUST 55 MPH S IN 2012

RECORDS FOR SEPTEMBER 20
HIGH 90 IN 1983
LOW 34 IN 1979
PRECIP 4.57 INS IN 1899
PEAK GUST 44 MPH NE IN 1972

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle