Tuesday, October 6, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 6, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

PLENTY OF BRIGHT SUNSHINE AND WARMER TODAY
TEMPERATURES RISING THOUGH THE 60’S
WINDS QUITE LIGHT

A very sunny day today after all the clouds yesterday
and temperatures had reached 67F by 2 p.m. along with the
dew points in the mid-40’s.  Winds are quite light with
the average since 8 A.M. EDT only 5 MPH.

SEPTEMBER Details below:

BHO Warmest Septembers (NWS mean), deg F (1885-2015):

1) 68.2 in 2015
2) 66.9 in 1961
3) 66.5 in 1930
4) 66.4 in 1999
5) 66.2 in 2002
66.2 in 2005

BHO Warmest September Average Maximum Temperature, deg F (1885-2015):

1) 77.8 in 2015
2) 76.6 in 1930
3) 75.7 in 2007
4) 75.6 in 1959
5) 75.5 in 1961

BHO Warmest September Average Minimum Temperature, deg F (1885-2015):

1) 58.8 in 1988
2) 58.5 in 2015
3) 58.2 in 1961
58.2 in 1999
5) 57.8 in 2005

BHO Warmest Aug-Sep (24-hour adjusted mean), deg F (1885-2015):

1) 69.8 in 2015
2) 68.9 in 2005
3) 68.6 in 2002
4) 68.2 in 2010
5) 67.8 in 1959

BHO Slowest September Mean Wind Speed, mph (1885-2015):

1) 10.3 in 2015
2) 10.5 in 2014
3) 10.6 in 2013
4) 10.7 in 2011
5) 10.9 in 1917
10.9 in 2003

BHO Sunniest Septembers, hours (1885-2015):

1) 267.7 in 1983  [74%] 2) 266.9 in 1941  [74%] 3) 265.9 in 2007  [74%] 4) 255.3 in 1948  [71%] 5) 251.9 in 2015  [70%] 6) 251.0 in 1967  [70%] 7) 246.8 in 1952  [69%] 246.8 in 1978  [69%]

BHO Sunniest Aug-Sep, hours (1885-2015):

1) 555.1 in 2015  [72%] 2) 553.0 in 1941  [72%] 3) 536.0 in 2007  [69%] 4) 527.3 in 2014  [68%] 5) 520.2 in 1932  [67%] 6) 515.3 in 1921  [67%] 7) 514.3 in 1968  [67%]

PRELIMINARY STATS FOR SEPTEMBER 2015

TEMPERATURE, Deg. F
Avg. Max. 77.8 [+6.2] Avg. Min. 58.5 [+3.9] Mean      68.2 [+5.1] Corrected mean: 67.3
Max. for month: 97 on 8th
Min. for month: 46 on 27th

COOLING DEGREE DAYS
Total cooling units: 144 [+84] Total for the season: 810 [+213] Total for last season: 587

HEATING DEGREE DAYS
Total heating units: 42 [-75] Total for the season: 43 [-99] Total for last season: 101

PRECIPITATION, Inches
Total: 3.88 [-0.18] Greatest in 24 hrs: 2.53 inches from 9/29-30

WIND, mph
Avg. uncorrected wind speed: 10.1
Avg. corrected wind speed: 10.3
Prevailing wind direction: SSW @ 13%
Peak gust and direction: 47 S on the 30th

SUNSHINE:
Campbell-Stokes card minutes: 15114 mins. of possible 21582 or 70%
Astronomical total minutes:   15766 mins. of possible 22472 or 70%

Today’s Observations:

7 A.M.
Weather: Clear, altocumulus and altocumulus lenticularis distant
WSW-NW, cirrus distant ENE-S
Temperature: 46F; Dew Point: 42F; Wind: N at 8 kts,
Sea-level pressure: 30.03 ins. Hg, steady
Visibility:  60 miles, few patches of shallow grond fog and
one dense patch distant WSW-W
6-hr Max temp: 48F
6-hr Min temp: 43F
24-hr precip: trace
BHO SA 1155 CLR 60 170/46/42/3508/003/ AC/ACSL DSNT WSW-NW
CI DSNT ENE-S PTCHS THN SHLW GF/LONE PTCH DNS DSNT WSW-W
LGT DSNT HZ HVY DEW/ 8/041 53000 10048 20043

10 A.M.
Weather: Clear, cumulus along distant SE horizon, altocumulus and
altocumulus lenticularis distant W-N, cirrus distant ESE-S
Temperature: 58F; Dew Point 45F; Wind: NW at 3 kts (estimated),
Wind: Light
Sea-level pressure: 30.04 ins. Hg, rising, rising than falling
slightly but higher than 3 hours ago
Visibility: 75 miles, thin smoke NNE-NE
BHO SA 1455 CLR 75 172/58/45/E3103/004/ CU ALG HRZN DSNT SE
AC/ACSL DSNT W-N CI DSNT ESE-S THN K NNE-NE WND LGT/
8/141 50002

1 P.M.
Weather: Clear, few small cumulus distant W, few altocumulus and
altocumulus lenticularis distant WNW-NNW, few cirrus distant ESE-S
and WNW
Temperature: 66F; Dew Point: 45F; Wind: NW  at 6 kts
Sea-level pressure: 29.98 ins. Hg, decreasing then more rapidly
Visibility: 80 miles
6-hr Max: 67F
6-hr Min: 46F
6-hr precip: none
BHO SA 1755 CLR 80 152/66/45/3206/998/ FEW SML CU DSNT W
FEW AC/ACSL DSNT WNW-NNW FEW DSNT CI ESE-S AND WNW/ 8/141 58020
10067 20046

SUMMARY FOR MONDAY, OCTOBER 5, 2015

TEMPERATURE (DEGREES F)
MAX…..59   NORMAL…..64
MIN…..46   NORMAL…..47
MEAN….53   NORMAL…..56

DEPARTURE FROM 30-YEAR NORMAL……………………-3
TOTAL DEPARTURE FOR THE MONTH…………………..-27  [-5.2 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…………810   DEPARTURE……..+212
TOTAL COOLING UNITS LAST SEASON TO DATE…….587   DIFFERENCE…….+223

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..12   DEPARTURE……….+2
TOTAL HEATING UNITS FOR THE MONTH…………..70   DEPARTURE………+25
TOTAL HEATING UNITS FOR THE SEASON…………113   DEPARTURE………-75
TOTAL HEATING UNITS LAST SEASON TO DATE…….158   DIFFERENCE……..-45

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….21  NE  AT 10:55 A.M.
ASOS……………………21  NE  AT 10:55 A.M.
DAVIS…………………..20  NE  AT 10-11 A.M. RMY 20
FASTEST MILE FOR YESTERDAY……………….. 13  NE  AT  9:26 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………14  NE  AT  9:31 A,M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..13  NE  AT  8:37 A,M.
AVERAGE WIND SPEED AND DIRECTION…………..9.0  ENE
ASOS…………………..8.7
DAVIS………………… 8.1  NE [045 DEG]

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………..0.52  DEPARTURE…..-0.22
ASOS……………0.50
TOTAL PRECIPITATION FOR THE YEAR………..34.19  DEPARTURE…..-5.16
ASOS…………….N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER & OCTOBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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  81/65/73/+5/0.00/766/97               20 SSW RMY 20
9/2  89/64/77/+9/0.00/732/93               20 SW  RMY 21
9/3  85/66/76/+9/T/612/78                  17 E   RMY N/A TSTM
9/4  72/58/65/-2/0.00/297/38               31 ENE RMY N/A
9/5  77/55/66/-1/0.00/748/96               14 SW  RMY 18
9/6  87/57/72/+5/0.00/753/97               21 SSW RMY 22
9/7  92/63/78/+12/0.00/727/94              23 WSW RMY 24
9/8  97/70/84/+18/0.00/693/90              22 WSW RMY 24
9/9  92/70/81/+15/0.00/683/89              30 SSW RMY 33
9/10 73/62/68/+3/0.32/000/00               29 NE  RMY N/A
9/11 70/59/65/0/0.59/084/11                33 NE  RMY N/A
9/12 75/58/67/2/…./380/50                18 SSE RMY 25
9/13 66/60/63/-1/…./000/00               25 E   RMY N/A
9/14 70/53/62/-2/0.00/550/73               33 W   RMY 35
9/15 82/56/69/+5/0.00/736/98               23 W   RMY N/A
9/16 84/62/73/+10/0.00/711/95              17 NW  RMY N/A
9/17 87/64/76/+13/0.00/723/97              17 SW  RMY 16
9/18 86/64/75/+13/0.00/712/96              21 SSW RMY 21
9/19 80/62/71/+9/0.00/480/65               22 S   RMY N/A
9/20 74/55/65/+3/T/552/75                  24 S   RMY N/A
9/21 65/50/58/-3/0.00/646/88               29 ENE RMY 30
9/22 67/55/61/+0/0.00/183/25               21 E   RMY 21
9/23 72/50/61/+1/0.00/677/93               15 E   RMY N/A
9/24 72/56/64/+4/0.00/696/96               22 E   RMY 21
9/25 66/53/60/0/0.00/556/77                21 E   RMY 20
9/26 63/49/56/-3/0.00/633/88               25 ENE RMY 25
9/27 71/46/59/+0/0.00/688/96               17 S   RMY 18
9/28 81/57/69/+11/0.00/428/60              22 SSW RMY 24
9/29 82/65/74/+16/…./320/45              28 S   RMY N/A
9/30 75/53/64/+6/…./000/00               47 S   RMY 51  TSTM

10/1 55/51/53/-4/…./…/..               39 NE  RMY N/A
10/2 51/47/49/-8/…./…/..               40 NE  RMY 43
10/3 51/45/48/-8/…./000/00               38 NE  RMY N/A
10/4 55/49/52/-4/0.00/…/..               35 E   RMY 40
10/5 59/46/53/-3/T/…/..                  21 NE  RMY 20

10/6 low since midnight is 43F; normal low is now 47F

DAILY RECORDS FOR SEPTEMBER & OCTOBER 2015

**9/7 DAILY RECORD MAXIMUM TEMPERATURE OF 92F
TIES PREVIOUS RECORD SET IN 2007**

**9/8 DAILY RECORD MAXIMUM TEMPERATURE OF 97F
BREAKS PREVIOUS RECORD OF 93F SET IN 2007**

**9/8 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F
BREAKS PREVIOUS RECORD OF 69F SET IN 1999**

**9/9 DAILY RECORD MAXIMUM TEMPERATURE OF 92F
BREAKS PREVIOUS RECORD OF 91F SET IN 2002**

**9/9 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F
BREAKS PREVIOUS RECORD OF 69F SET IN 1999**

**9/17 DAILY RECORD MAXIMUM TEMPERATURE OF 87F
BREAKS PREVIOUS RECORD OF 86F SET IN 1915, 1941, AND 1991**

**9/18 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 64F
TIES PREVIOUS RECORD SET IN 1992**

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

RECORDS FOR OCTOBER 6
HIGH 83F IN 1990, 2007
LOW 26F IN 1965
PRECIP 3.78 INCHES IN 1962
PEAK GUST 60e MPH S IN 1942

RECORDS FOR OCTOBER 7
HIGH 88F IN 1963 (RECORD FOR MONTH)
LOW 30F IN 1904,1986
PRECIP 1.75 INCHES IN 1972
PEAK GUST 54 W IN 2009

TODAY’S REPORT PREPARED BY: Robert Skilling