Saturday, October 1, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, OCTOBER 1, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

STEADY RAIN ARRIVES FRIDAY AFTERNOON AND CONTINUES
OVERNIGHT… BRIEF PERIOD OF HEAVY RAIN THIS MORNING
CHANGES TO DRIZZLE…STORM TOTAL OVER AN INCH…
SEPTEMBER 2016 FINISHES AS SEVENTH WARMEST ON RECORD…

Temperatures have remained steady in the middle 50s since
Friday. Rain showers arrived at the observatory yesterday
afternoon and continued into mid-morning today with a brief
period of heavy rain shortly after the 7 AM EST observation.
Light rain tapered off to heavy drizzle by mid-morning with
the visibility holding below 1/4 mile all day. The total
rainfall through 7 AM EST was 0.93 inches.  Another 0.29 inches
was measured in the six hours ending at 1 PM EST, bringing the
storm total up to 1.22 inches through that time. Gusty winds
from the NE have continued all day reaching a high of
32 mph (28 kts) NE at 11:10 AM EST.

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: Sky obscured in light rain and dense fog
Temperature: 55F; Dew Point: 55F; Wind: NE at 14G28 kts
Wind: Peak wind 28 kts NE at 6:52 AM EST
Sea-level pressure: 30.30 ins. Hg, increasing then decreasing
Visibility: 1/8 mile
6-hr Max temp: 55F
6-hr Min temp: 55F
24-hr precip: 0.93 in.
BHO SA 1155 W2 X 1/8R-F 260/55/55/0514G28/030/
PK WND 0528/52/ 8//// 50003 60/// 70093 10055 20055

10 A.M.
Weather: Sky obscured in heavy drizzle and dense fog
Temperature: 55F; Dew Point: 55F; Wind: NE at 17G24 kts,
Sea-level pressure: 30.29 ins. Hg, falling slightly
Visibility: 1/8 mile
3-hour precip: 0.19 in.
BHO SA 1455 W2 X 1/8L+F 257/55/55/0517G24/029/
8//// 58003 6019/

1 P.M.
Weather: Sky obscured in heavy drizzle and dense fog
Temperature: 56F; Dew Point: 56F; Wind: NE at 13 kts
Sea-level pressure: 30.24 ins. Hg, falling then more quickly
Visibility: 1/8 mile, variable 1/8 to 1/4 mile
6-hr Max. temp: 56F
6-hr Min. temp: 55F
6-hr precip: 0.29 in.
BHO SA 1755 W2 X 1/8VL+F 242/56/56/0413/024/
1/8V1/4/ 8//// 58015 6029/ 10056 20055

SUMMARY FOR FRIDAY, SEPTEMBER 30, 2016

TEMPERATURE (DEGREES F)
MAX…..58   NORMAL…..66
MIN…..53   NORMAL…..49
MEAN….56   NORMAL…..58

DEPARTURE FROM 30-YEAR NORMAL……………………-2
TOTAL DEPARTURE FOR THE MONTH…………………..+92 [+2.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….102   DEPARTURE………+42
TOTAL COOLING UNITS FOR THE SEASON…………894   DEPARTURE……..+297
TOTAL COOLING UNITS LAST SEASON TO DATE…….810   DIFFERENCE……..+84

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………9   DEPARTURE……….+1
TOTAL HEATING UNITS FOR THE MONTH…………..65   DEPARTURE………-52
TOTAL HEATING UNITS FOR THE SEASON………….75   DEPARTURE………-67
TOTAL HEATING UNITS LAST SEASON TO DATE……..43   DIFFERENCE……..+32

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….32 ENE AT  9:35 A.M.
ASOS……………………34 ENE AT  9:36 A.M.
DAVIS…………………..31  NE AT 12:31 A.M. RMY 32
FASTEST MILE FOR YESTERDAY…………………23 ENE AT 10:21 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 ENE AT 10:21 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..21  NE AT 10:21 A.M.
AVERAGE WIND SPEED AND DIRECTION………….15.4  NE
ASOS………………….15.7
DAVIS…………………13.2 NE  [055 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.93  DEPARTURE……+0.78
ASOS…………..0.92
TOTAL PRECIPITATION FOR THE MONTH……….0.63  DEPARTURE……+0.48
ASOS…………..0.62
TOTAL PRECIPITATION FOR THE YEAR……….27.95  DEPARTURE…..-11.13
ASOS………….27.96

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

10/1 Low temp since midnight is 55F; normal low is now 49F

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 OCTOBER 1
HIGH 85F IN 1927
LOW 30F IN 1992
PRECIP 1.63 INCHES IN 2014
PEAK GUST 68e MPH SSE IN 1977

RECORDS FOR OCTOBER 2
HIGH 85F IN 1968
LOW 29F IN 1899
PRECIP 1.75 INCHES IN 1984
PEAK GUST 52e MPH S IN 1952, 52 NNW IN 1984

TODAY’S REPORT PREPARED BY: Mike Iacono / Pietro Volpe