Sunday, October 29, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, OCTOBER 29, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST DAY WITH A FEW RAIN SHOWERS

Pressure is beginning to drop as winds shifted
from the south yesterday to the SSE today.
Winds are starting to pick up with gust so
far up to 20 kts (23 MPH). Temperatures have
returned to more seasonable after an above
seasonable October. We had a high of 61F by
1:00 P.M. Overnight we got down to 55F. This
is a warm 16 degrees above the normal low for
this day in October. Rain has been on and off
all day leaving only 0.01 inches of precipitation
on top of Great Blue Hill by 1:00 P.M.
Skies have remained overcast with a mixture
of altostratus and stratus fractus clouds.

Today’s Observations:

7 A.M.
Weather: Overcast altostratus
Temperature: 59F; Dew Point: 53F; Wind: SE at 13 kts
Sea-level pressure: 29.94 ins. Hg, decreasing then increasing
Visibility: 35 miles
6-hr Max temp: 58F
6-hr Min temp: 55F
24-hr precip: 0.00 ins.
BHO SA 1155 E90 OVC 35 140/59/53/1413/994/ 8/020 55000 10058 20055

10 A.M.
Weather: Scattered stratus fractus, overcast altostratus
Temperature: 60F; Dew Point: 55F; Wind: SE at 10 kts
Sea-level pressure: 29.89 ins. Hg, decreasing then, more quickly
Visibility: 35 miles distant fog in all directions
3-hr precip: Trace
BHO SA 1455 19 SCT E90 OVC 30 123/60/55/1310/989/ DSNT FG ALQDS/
8/720 58017 MANUAL 6000/

1 P.M.
Weather: Scattered stratus fractus, overcast altostratus
Temperature: 61F; Dew Point: 57F; Wind: ESE at 12 kts,
Sea-level pressure: 29.80 ins. Hg, falling, then more quickly
Visibility: 30 miles distant fog in all directions
6-hr Max temp: 61F
6-hr Min temp: 57F
6-hr precip: 0.01
BHO SA 1755 44 SCT E90 OVC 30 093/61/57/1212/980/ DSNT FG ALQDS/
8/720 58030 MANUAL 6001/ ASOS 60001 10061 20057

SUMMARY FOR SATURDAY, OCTOBER 28, 2017

TEMPERATURE (DEGREES F)
MAX…..66   NORMAL…..56
MIN…..47   NORMAL…..39
MEAN….57   NORMAL…..48

DEPARTURE FROM 30-YEAR NORMAL…………………….+9
TOTAL DEPARTURE FOR THE MONTH…………………..+239 [+8.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH…………..24   DEPARTURE………+19
TOTAL COOLING UNITS FOR THE SEASON…………731   DEPARTURE……..+129
TOTAL COOLING UNITS LAST SEASON TO DATE…….901   DEPARTURE……..-170

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………8   DEPARTURE……….-9
TOTAL HEATING UNITS FOR THE MONTH………….145   DEPARTURE……..-222
TOTAL HEATING UNITS FOR THE SEASON…………238   DEPARTURE……..-271
TOTAL HEATING UNITS LAST SEASON TO DATE…….368   DEPARTURE……..-130

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….24  S   AT  12:53 P.M.
AERO……………………23 SSE  AT   4:33 P.M.
ASOS……………………26  S   AT   4:33 P.M.
DAVIS…………………..27 SSW  AT   1:36 P.M.  RMY 26
FASTEST MILE FOR YESTERDAY…………………19  S   AT   1:49 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………18  S   AT   4:33 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..18  S   AT   1:49 P.M.
AVERAGE WIND SPEED AND DIRECTION………….13.0  SSE
ASOS………………….13.1
DAVIS…………………12.0  SSW  [196 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.82  DEPARTURE……-1.40
ASOS…………..2.93
TOTAL PRECIPITATION FOR THE YEAR……….44.68  DEPARTURE……+1.38
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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  65/42/54/-3/0.00/697/99             18 WNW AERO 16 NW  RMY N/A
10/2  65/46/56/-1/0.00/687/98             21 NNW AERO 21 NNW RMY 21
10/3  67/50/59/+3/0.00/677/97             21 S   AERO 21 S   RMY N/A
10/4  75/50/63/+7/0.00/660/95             30 SSW AERO 30 SW  RMY 32
10/5  79/60/70/+14/0.00/429/62            28 SW  AERO 26 SW  RMY N/A
10/6  73/57/65/+10/T/352/51               15 NW  AERO 14 NW  RMY 15
10/7  75/59/67/+12/T/344/50               29 S   AERO 30 SSW RMY N/A
10/8  71/67/69/+15/0.23/007/01            33 S   AERO 36 SSW RMY 37
10/9  71/68/70/+16/0.22/000/00            43 S   AERO 41 S   RMY 45
10/10 76/61/69/+15/0.00/637/94            21 WNW AERO 20 WNW RMY 21
10/11 68/55/62/+9/0.00/122/18             29 ENE AERO 25 ENE RMY 29
10/12 58/48/50/0/T/169/25                 30 NE  AERO 28 ENE RMY 30
10/13 64/48/56/+3/0.00/545/81             20 E   AERO 16 E   RMY 17
10/14 66/54/60/+8/0.04/637/94             15 SSE AERO 13 SSE RMY 13
10/15 72/58/65/+13/0.01/067/10            39 SSW AERO 36 SSW RMY 40
10/16 66/39/53/+2/T/146/22                28 NNW AERO 25 NNW RMY 29
10/17 57/35/46/-5/0.00/007/01             25 S   AERO 22 S   RMY 25
10/18 70/45/58/+7/0.00/659/100            25 SW  AERO 23 SW  RMY 22
10/19 72/52/62/+12/0.00/649/99            31 SSW AERO 30 SSW RMY 32
10/20 68/53/61/+11/0.00/…/..            28 WNW AERO 25 WNW RMY 29
10/21 77/52/65/+15/0.00/…/..            21 NW  AERO 20 NW  RMY 18
10/22 73/54/64/+15/0.00/…/..            21 ENE AERO 16 ENE RMY 17
10/23 69/50/60/+11/0.00/…/..            24 SSE AERO 24 SSE RMY N/A
10/24 73/64/69/+20/…/…/..             50 SSE AERO 51 S   RMY N/A
10/25 69/57/63/+14/…/…/..             50 SSW AERO 50 SSW RMY N/A
10/26 60/44/52/+4/…/…/..              40 W   AERO 41 W   RMY 39
10/27 60/42/51/+3/0.00/…/..             28 W   AERO 25 W   RMY N/A
10/28 66/47/57/+9/0.00/…/..             24 S   AERO 23 S   RMY 26

10/29 Low temp since midnight is 55F; normal low is now 39F

DAILY RECORDS FOR OCTOBER

10/8/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 60F SET IN 1944

10/9/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 61F SET IN 2011

10/9/17: MONTHLY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 67F SET ON OCTOBER 13, 1990
AND TIED ON OCTOBER 8, 2017

10/24/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 64F,
BREAKS PREVIOUS RECORD OF 61F SET IN 2001

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

RECORDS FOR OCTOBER 29
HIGH 74F IN 1989
LOW 23F IN 1891
PRECIP 2.42 INCHES IN 2012
SNOWFALL 4.0 INCHES IN 2011
PEAK GUST 76 E IN 2012

RECORDS FOR OCTOBER 30
HIGH 75F IN 1946,1989
LOW 21F IN 1928
PRECIP 1.85 INCHES IN 1917
SNOWFALL 2.0 INCHES IN 2011
PEAK GUST 66 NW IN 1963

TODAY’S REPORT PREPARED BY: Kaitlin Ann Geagan