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Tuesday, October 15, 2019

October 15, 2019

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, OCTOBER…

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 15, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER WITH EXCELLENT VISIBILITY
ATOP GREAT BLUE HILL….

Today we observed almost cloudless skies and an excellent
visibility of 85 miles. Wind was around 10 mph, shifting
from NW-W since this morning. Pressure has been trending
downward since noontime, in conjunction with the humidity.
Conditions have been dry today, with dew points in the
upper 30’s.

The high so far today is 59F, 2 degrees below the daily
normal maximum of 61F. The low since midnight is 43F,
the same as the normal minimum.

PRELIMINARY STATS FOR SEPTEMBER 2019

TEMPERATURE, Deg. F
Avg. Max. 73.6 [+2.0] Avg. Min. 54.5 [-0.1] Mean      64.1 [+1.0] 24-hour corrected mean: 63.4
Max. for month: 88F on the 23rd
Min. for month: 43F on the 19th

HEATING DEGREE DAYS
Total heating units:    81 [-36] Total for the season:   93 [-49] Total for last season:  87

COOLING DEGREE DAYS
Total cooling units:    58  [-2] Total for the season:  680 [+83] Total for last season: 863

PRECIPITATION, Inches
Total: 1.27 [-2.79] Greatest in 24 hrs: 0.37 ins. on the 2nd

WIND, mph
Avg. uncorrected wind speed: 10.3 mph
Avg. corrected wind speed:   10.9 mph
Prevailing wind direction:   SSW [11%] Peak gust and direction:     39 W on the 2nd

SUNSHINE:
Campbell-Stokes card minutes: 14790 minutes of possible 21582 or 69%
Astronomical total minutes: 15399 minutes of possible 22468 or 69%

Today’s Observations:

7 A.M.
Weather: Few cumulus
Temperature: 44F; Dew Point: 38F; Wind: NW at 9 kts
Sea-level pressure: 30.13 ins. Hg, rising steadily
Visibility: 80 miles
6-hr Max temp: 51F
6-hr Min temp: 43F
BHO SA 1155 CLR 80 202/44/38/3109/013/ FEW CU ALQDS/ 8/100
53017 10051 20043

10 A.M.
Weather: Few cumulus
Temperature: 54F; Dew Point: 35F; Wind: NW at 8 kts
Sea-level pressure: 30.16 ins. Hg, falling then rising
Visibility: 85 miles
BHO SA 1455 CLR 85 210/54/35/3108/016/ FEW CU ALQDS/ 8/100
50008

1 P.M.
Weather: Few cumulus and cirrus
Temperature: 58F; Dew Point: 36F; Wind: W at 10 kts
Sea-level pressure: 30.12 ins. Hg, decreasing then decreasing
more slowly
Visibility: 85 miles
6-hr Max temp: 59F
6-hr Min temp: 44F
BHO SA 1755 CLR 85 200/58/36/2610/012/ FEW CU/CI ALQDS/ 8/101
58010 10059 20044

SUMMARY FOR MONDAY, OCTOBER 14, 2019

TEMPERATURE (DEGREES F)
MAX…..67   NORMAL…..61
MIN…..51   NORMAL…..43
MEAN….59   NORMAL…..52

DEPARTURE FROM 30-YEAR NORMAL…………………+7
TOTAL DEPARTURE FOR THE MONTH…………………+1 [-0.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………….6   DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE MONTH…………..146  DEPARTURE…….. -5
TOTAL HEATING UNITS FOR THE SEASON………….239  DEPARTURE……..-54
TOTAL HEATING UNITS LAST SEASON TO DATE……..193  DEPARTURE……..+46

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……….0
TOTAL COOLING UNITS FOR THE MONTH…………….2  DEPARTURE………-2
TOTAL COOLING UNITS FOR THE SEASON………….682  DEPARTURE……..+81
TOTAL COOLING UNITS LAST SEASON TO DATE……..874  DEPARTURE…….-192

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..18 WSW AT 9:24 P.M.
AERO…………………….17 WSW AT 9:23 P.M.
ASOS…………………….20 SSW AT 8:15 P.M.
DAVIS……………………19 WSW AT 9:23 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….15 WSW AT 9:24 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 WSW AT 9:26 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………15 WSW AT 9:25 P.M.
AVERAGE WIND SPEED AND DIRECTION……………..7.0 S
ASOS……………………..7.3
DAVIS…………………….7.2 SSW [201 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.66  DEPARTURE……+0.59
ASOS…………..2.76
TOTAL PRECIPITATION FOR THE YEAR……….41.08  DEPARTURE……-0.08
ASOS………….40.99

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

9/01  73/56/65/-3/0.00/703/89                21 ENE AERO 14 ENE RMY 18
9/02  75/57/66/-2/0.37/165/21                39 W   AERO 41 W   RMY 41
9/03  77/61/69/+2/0.00/643/82                18 S   AERO 16 S   RMY N/A
9/04  83/61/72/+5/0.00/375/48                30 SW  AERO 28 SW  RMY 30
9/05  68/54/61/-6/0.00/513/66                23 NW  AERO 17 NW  RMY N/A
9/06  65/56/61/-6/0.03/054/07                37 ENE AERO 36 ENE RMY 36
9/07  70/51/61/-5/0.27/325/42                37 N   AERO 37 N   RMY N/A
9/08  73/53/63/-3/0.00/631/82                25 W   AERO 21 W   RMY N/A
9/09  71/54/63/-3/0.00/537/70                17 SE  AERO 16 SE  RMY 16
9/10  73/57/65/0/0.00/207/27                 25 S   AERO 25 S   RMY N/A
9/11  83/63/73/+8/0.00/419/55                31 SW  AERO 32 SW  RMY N/A
9/12  70/52/61/-4/0.11/015/02                29 ENE AERO 28 ENE RMY 28
9/13  65/49/57/-7/0.00/741/98                29 ENE AERO 27 ENE RMY 27
9/14  69/49/59/-5/0.19/030/04                36 S   AERO 37 S   RMY 37
9/15  78/62/70/+6/0.00/600/80                24 W   AERO 23 W   RMY 22
9/16  72/54/63/0/T/673/90                    25 WNW AERO 23 WNW RMY 25
9/17  67/49/58/-5/0.00/611/82                23 NW  AERO 23 N   RMY N/A
9/18  61/49/55/-7/0.00/579/78                26 NE  AERO 25 NE  RMY 25
9/19  67/43/55/-7/0.00/709/96                17 NE  AERO 18 NE  RMY N/A
9/20  78/50/64/+2/0.00/677/92                21 W   AERO 18 W   RMY 20
9/21  83/60/72/+11/0.00/689/94               21 WNW AERO 18 WNW RMY N/A
9/22  85/62/74/+13/0.00/687/94               24 SW  AERO 23 SW  RMY 25
9/23  88/65/77/+17/0.00/539/74               29 SSW AERO 28 SSW RMY 29
9/24  76/56/66/+6/0.04/616/85                26 W   AERO 26 W   RMY 27
9/25  73/50/62/+2/0.00/686/95                22 W   AERO 21 W   RMY 21
9/26  79/55/67/+8/0.25/388/54                38 SW  AERO 37 SW  RMY 39
9/27  72/50/61/+2/0.00/695/97                23 S   AERO 23 S   RMY 22
9/28  78/55/67/+9/0.00/664/93                31 S   AERO 29 S   RMY 30
9/29  75/53/64/+6/0.00/619/87                24 NW  AERO 23 NW  RMY 23
9/30  62/49/56/-2/0.00/609/86                23 NNE AERO 16 NNE RMY N/A

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

10/01  67/52/60/+3/0.06/…/..               28 SW  AERO 25 SSW RMY 29
10/02  74/49/62/+5/0.42/…/..               30 ENE AERO 25 ENE RMY 28
10/03  51/46/49/-7/…./…/..               28 ENE AERO 26 ENE RMY N/A
10/04  59/40/50/-6/…./…/..               38 NNW AERO 38 NNW RMY 38
10/05  58/35/47/-9/0.00/…/..               21 N   AERO 18 SSW RMY N/A
10/06  65/44/55/0/0.00/…/..                36 SSW AERO 35 SSW RMY N/A
10/07  77/57/67/+12/0.12/…/..              47 SSW AERO 46 SSW RMY 49
10/08  60/52/56/+2/T/…/..                  22 NE  AERO 18 NW  RMY N/A
10/09  55/49/52/-2/…./…/..               43 NE  AERO 37 NE  RMY 44
10/10  54/47/51/-3/…./…/.. 41 NE  AERO 37 NE  RMY 42
10/11  52/48/50/-3/…./000/00               41 NE  AERO 39 NE  RMY 41
10/12  52/49/51/-2/…./…/..               39 NE  AERO 37 NE  RMY N/A
10/13  66/48/57/+4/…./…/.. 18 WNW AERO 17 WNW RMY 18
10/14  67/51/59/+7/…./…/..               18 WSW AERO 17 WSW RMY N/A

10/15 The low since midnight is 43F, normal daily minimum is 43F

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

RECORDS FOR OCTOBER 15
HIGH 83F IN 1897
LOW 29F IN 1887,1937
PRECIP 4.58 INCHES IN 2005
SNOWFALL TRACE IN 1961,1972
PEAK GUST 69 MPH W IN 2003

RECORDS FOR OCTOBER 16
HIGH 86F IN 1897
LOW 28F IN 1886
PRECIP 2.82 INCHES IN 1974
SNOWFALL TRACE IN 2009
PEAK GUST 68e MPH SSE IN 1954 (HURRICANE HAZEL)

TODAY’S REPORT PREPARED BY: Benjamin Turner

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