Monday, October 3, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, OCTOBER 3, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

CLEARER SKIES TODAY AS TEMPS CLIMB TO UPPER 60s

After an overcast, foggy, and chilly weekend at Blue Hill, skies cleared
to partly sunny today, and visibility reached 70 miles in the afternoon.
Temperatures rebounded to the upper 60s with a max. temperature of 69F
by 1:00PM EST. An additional 0.02 in. of precip. was measured at 7:00AM
this morning, adding to yesterday’s daily total.

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 distant altocumulus NE-SW, few cirrocumulus in all
directions, broken cirrostratus
Temperature: 55F; Dew Point: 54F; Wind: WSW at 7 kts
Sea-level pressure: 29.98 ins. Hg, steady then rising
Visibility: 20 miles
6-hr Max temp: 55F
6-hr Min temp: 53F
24-hr precip: 0.07 in.
BHO SA 1155 BKN 250 20F 154/55/54/2507/998/ FEW DSNT AC NE-SW FEW CC ALQDS/
8/036 MANUAL 70007 ASOS 70006 10055 20053

10 A.M.
Weather: Scattered cumulus, few cirrocumulus NE-ESE, scattered cirrostratus
Temperature: 62F; Dew Point: 57F; Wind: estimated WNW at 2 kts,
Wind: Light and variable
Sea-level pressure: 30.01 ins. Hg, rising, then less quickly
Visibility: 70 miles
BHO SA 1455 19 SCT 250 SCT 164/62/57/E2902/001/ FEW CC NE-ESE WND L/V/
8/108 53010

1 P.M.
Weather: Scattered cumulus, scattered altocumulus, scattered cirrus
Temperature: 65F; Dew Point: 53F; Wind: NE at 7 kts
Sea-level pressure: 30.01 ins. Hg, rising then falling
Visibility: 70 miles
6-hr Max. temp: 69F
6-hr Min. temp: 54F
BHO SA 1755 18 SCT 170 SCT 250 SCT 70 164/65/53/0507/001/ 8/132 55000
10069 20054

SUMMARY FOR SUNDAY, OCTOBER 2, 2016

TEMPERATURE (DEGREES F)
MAX…..55   NORMAL…..65
MIN…..52   NORMAL…..48
MEAN….54   NORMAL…..57

DEPARTURE FROM 30-YEAR NORMAL……………………-3
TOTAL DEPARTURE FOR THE MONTH……………………-5 [-2.7 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…………..11   DEPARTURE……….+2
TOTAL HEATING UNITS FOR THE MONTH…………..21   DEPARTURE……….+4
TOTAL HEATING UNITS FOR THE SEASON………….96   DEPARTURE………-63
TOTAL HEATING UNITS LAST SEASON TO DATE……..71   DIFFERENCE……..+25

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 N   AT  5:22 A.M.
ASOS……………………24 NNE AT  5:24 A.M.
DAVIS…………………..22 N   AT  5:23 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………14 NNE AT  6:36 A.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 NNE AT  6:38 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..14 NNE AT 12:00 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..6.4 N
ASOS…………………..6.2
DAVIS………………….5.7 N  [010 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.07  DEPARTURE……-0.08
ASOS…………..0.06
TOTAL PRECIPITATION FOR THE MONTH……….1.41  DEPARTURE……+1.10
ASOS…………..1.43
TOTAL PRECIPITATION FOR THE YEAR……….28.73  DEPARTURE…..-10.66
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/…./000/00                 33 NNE AERO  M     RMY 34
10/2  55/52/54/-3/…./…/..                 23 N   AERO  M     RMY N/A

10/3 Low temp since midnight is 53F; normal low is now 48F

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

RECORDS FOR OCTOBER 3
HIGH 82F IN 1922
LOW 28F IN 1899
PRECIP 1.76 INCHES IN 1979
PEAK GUST 62 MPH WNW IN 1964

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

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle