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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 4, 2016  
ALL TIMES ARE IN EASTERN STANDARD TIME

HIGH PRESSURE IN GULF OF MAINE BRINGING DRY AIR INTO REGION

Overcast clouds brought a trace of very light drizzle before the 
7:00AM EST observation this morning.  Cloud cover began to dissipate
shortly after as dry air moved into the region from high pressure to
our north causing dew points to fall into the upper 40s.  Temperatures
had reached a maximum of 61F by 1:00PM EST following an overnight low
of 54F.


PRELIMINARY STATS FOR SEPTEMBER 2016
 
TEMPERATURE, Deg. F
Avg. Max. 74.0 [+2.4]
Avg. Min. 57.9 [+3.3]
Mean      66.0 [+2.9]
24-hour corrected mean: 65.2
Max. for month: 90F on 9th
Min. for month: 43F on 26th
 
HEATING DEGREE DAYS
Total heating units: 65 [-52] 
Total for the season: 75 [-67]
Total for last season: 43
 
COOLING DEGREE DAYS
Total cooling units: 102 [+42] 
Total for the season: 894 [+297]
Total for last season: 810
 
PRECIPITATION, Inches
Total: 2.35 [-1.71]
Greatest in 24 hrs: 1.06 on the 5-6th
 
WIND, mph
Avg. uncorrected wind speed: 10.8
Avg. corrected wind speed: 11.2
Prevailing wind direction: S at 14%
Peak gust and direction: 42 NNE on 5th
 
SUNSHINE:
Campbell-Stokes card minutes: 10980 mins. of possible 21582 or 51%
Astronomical total minutes: 11407 mins. of possible 22407 or 51%

The 24-hour corrected mean temperature for September of
65.2 deg F is the seventh warmest on record and the warmest
only since last September, which was the warmest on record. 

BHO Warmest Septembers, deg F (1885-2016):

1) 67.2 in 2015
2) 66.1 in 1961
3) 65.5 in 2005
4) 65.4 in 1999
   65.4 in 2010
6) 65.3 in 1930
7) 65.2 in 2016
8) 65.0 in 2002


7 A.M. 
Weather: Thin fog, few cumulus NE-E broken stratus, overcast stratus
Temperature: 57F; Dew Point: 55F; Wind: ENE at 8 kts
Sea-level pressure: 30.32 ins. Hg, rising, then more quickly
Visibility: 6 miles, except 10 miles NNW-E
6-hr Max temp: 57F
6-hr Min temp: 54F
24-hr precip: Trace
BHO SA 1155 E27 BKN 40 OVC 6F 268/57/55/0608/032/ FEW CU NE-E VSBY NNW-E 10/
8/6// 53019 10057 20054

10 A.M.
Weather: Broken stratocumulus, few altocumulus NE and SSW
Temperature: 57F; Dew Point: 52F; Wind: NE at 12G19 kts
Sea-level pressure: 30.36 ins. Hg, rising, then less quickly
Visibility: 20 miles
BHO SA 1455 E38 BKN 20 280/57/52/0512G19/036/ FEW AC NE AND SSW/ 8/530 51012

1 P.M.
Weather: Scattered cumulus, scattered altocumulus
Temperature: 59F; Dew Point: 49F; Wind: NE at 16G21 kts
Sea-level pressure: 30.36 ins. Hg, rising then falling
Visibility: 35 miles
6-hr Max. temp: 61F 
6-hr Min. temp: 56F
BHO SA 1755 65 SCT 79 SCT 35 280/59/49/0516G21/036/ 8/130 50000 10061 20056

SUMMARY FOR MONDAY, OCTOBER 3, 2016
 
TEMPERATURE (DEGREES F)
MAX.....69   NORMAL.....65
MIN.....53   NORMAL.....48
MEAN....61   NORMAL.....56

DEPARTURE FROM 30-YEAR NORMAL........................+5
TOTAL DEPARTURE FOR THE MONTH.........................0 [0.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE...........0
TOTAL COOLING UNITS FOR THE MONTH...............0   DEPARTURE..........-1
TOTAL COOLING UNITS FOR THE SEASON............894   DEPARTURE........+296
TOTAL COOLING UNITS LAST SEASON TO DATE.......810   DIFFERENCE........+84 

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............4   DEPARTURE..........-5
TOTAL HEATING UNITS FOR THE MONTH..............25   DEPARTURE..........-1
TOTAL HEATING UNITS FOR THE SEASON............100   DEPARTURE.........-69
TOTAL HEATING UNITS LAST SEASON TO DATE........88   DIFFERENCE........+12

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................21 ENE AT  3:49 P.M.* 
                   ASOS........................21 E   AT  3:46 P.M.  
                   DAVIS.......................20 NE  AT  3:45 P.M. RMY 20 
FASTEST MILE FOR YESTERDAY.....................15 ENE AT  3:44 P.M.     
MAXIMUM 2-MINUTE ASOS AVERAGE..................16 ENE AT  3:46 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE.................13 ENE AT  3:47 P.M.   
AVERAGE WIND SPEED AND DIRECTION..............7.3 ENE
                   ASOS.......................8.2
                   DAVIS......................6.6 NE [050 Deg.]
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...Trace  DEPARTURE......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.41  DEPARTURE......+0.96
                         ASOS..............1.43
TOTAL PRECIPITATION FOR THE YEAR..........28.73  DEPARTURE.....-10.80
                         ASOS.............29.07 
 
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/229/30                   25 S   AERO 18 S   RMY 32
9/11 79/59/69/+4/0.10/365/48                 39 WNW AERO 30 WNW RMY 43
9/12 76/53/65/0/0.00/749/99                  18 SW* AERO 13 WNW RMY 19
9/13 81/57/69/+5/0.00/739/98                 25 SSW AERO  M     RMY 26
9/14 87/58/73/+9/T/526/70                    35 NNW AERO  M     RMY 35
9/15 67/52/60/-4/0.00/531/71                 21 NE  AERO  M     RMY 20
9/16 74/54/64/+1/0.00/567/76                 23 SSE AERO  M     RMY 24   
9/17 77/54/66/+3/0.00/676/91                 28 S   AERO  M     RMY 28
9/18 79/63/71/+9/T/133/18                    30 SW  AERO  M     RMY 33
9/19 73/67/70/+8/0.16/000/00                 25 S   AERO  M     RMY N/A
9/20 81/66/74/+12/0.00/316/43                16 WSW*AERO  M     RMY N/A
9/21 81/64/73/+12/T/541/74                   20 WNW AERO  M     RMY 18
9/22 82/63/73/+12/0.00/700/96                23 S   AERO  M     RMY 25   
9/23 80/53/67/+7/0.16/152/21                 32 NE  AERO  M     RMY 32 
9/24 66/48/57/-3/0.03/643/89                 24 NW  AERO  M     RMY 25
9/25 65/44/55/-5/0.00/698/97                 31 NW  AERO  M     RMY 32
9/26 68/43/56/-3/0.00/624/87                 25 S   AERO  M     RMY 25
9/27 69/57/63/+4/0.31/021/03                 23 S   AERO  M     RMY N/A
9/28 59/52/56/-2/0.08/000/00                 33 NNE AERO  M     RMY N/A
9/29 55/52/54/-4/0.00/028/04                 33 NE  AERO  M     RMY N/A
9/30 58/53/56/-2/0.30/000/00                 32 ENE AERO  M     RMY 32

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


PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/1  57/52/55/-2/1.22/000/00                 33 NNE AERO  M     RMY 34
10/2  55/52/54/-3/0.19/.../..                 23 N   AERO  M     RMY N/A
10/3  69/53/61/+5/0.00/.../..                 21 ENE AERO  M     RMY 20

10/4 Low temp since midnight is 54F; normal low is now 47F

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

RECORDS FOR OCTOBER 4
HIGH 84F IN 2007 
LOW 28F IN 1888
PRECIP 1.87 INCHES IN 2011
PEAK GUST 59 MPH SSW IN 1990

RECORDS FOR OCTOBER 5
HIGH 86F IN 2007
LOW 29F IN 1965
PRECIP 3.17 INCHES IN 1962
PEAK GUST 64e MPH S IN 1979

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle