Tuesday, October 30, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 30, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

A COOL AND DRY AUTUMN DAY WITH GOOD VISIBILITY ATOP
GREAT BLUE HILL….

Partly cloudy skies this morning became overcast after
noontime. Visibility increased from 70 miles to 80 miles
at the 1 P.M. observation. Winds have stayed from the west
throughout the day, blowing at an average of 15 mph. The
peak gust so far of 28 mph (24 kts) occurred shortly before
11 A.M. The high so far today is 45F, which is 11 degrees
below the daily normal of 56F. The low since midnight is
45F, 7 degrees above the normal minimum of 38F.

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus
Temperature: 38F; Dew Point: 31F; Wind: W at 8G14 kts
Sea-level pressure: 29.93 ins. Hg, rising steadily
Visibility: 70 mile
6-hr Max temp: 40F
6-hr Min temp: 36F
24-hr Precip: 0.31 ins.
BHO SA 1155 50 SCT 70 135/38/31/2708G14/993/ 8/500 70031
53017 10040 20036

10 A.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 45F; Dew Point: 31F; Wind: WNW at 13G22 kts
Sea-level pressure: 29.96 ins. Hg, falling then rising
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 35 SCT 250 SCT 70 144/45/31/2913G22/996/ 8/102
51009

1 P.M.
Weather: Overcast stratocumulus
Temperature: 45F; Dew Point: 30F; Wind: NW at 11G18 kts,
Sea-level pressure: 29.96 ins. Hg, steady
Visibility: 80 miles
6-hr Max temp: 45F
6-hr Min temp: 37F
6-hr Precip: 0.00 ins.
BHO SA 1755 E40 OVC 80 147/45/30/3011G18/996/ 8/4// 53003
10045 20037
SUMMARY FOR MONDAY, OCTOBER 29, 2018

TEMPERATURE (DEGREES F)
MAX…..55   NORMAL…..56
MIN…..40   NORMAL…..39
MEAN….48   NORMAL…..47

DEPARTURE FROM 30-YEAR NORMAL…………………..+1
TOTAL DEPARTURE FOR THE MONTH………………….-21 [-0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..17   DEPARTURE………-1
TOTAL HEATING UNITS FOR THE MONTH………….411   DEPARTURE……..+26
TOTAL HEATING UNITS FOR THE SEASON…………498   DEPARTURE……..-29
TOTAL HEATING UNITS LAST SEASON TO DATE…….244   DIFFERENCE……+254

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0  DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH…………..11  DEPARTURE……….+6
TOTAL COOLING UNITS FOR THE SEASON…………874  DEPARTURE……..+272
TOTAL COOLING UNITS LAST SEASON TO DATE…….731  DIFFERENCE…….+143

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..30 WSW AT  11:58 A.M.
AERO…………………….30 WSW AT  11:58 A.M.
ASOS…………………….30 W   AT  11:59 A.M.
DAVIS……………………32 W   AT  11:59 A.M. RMY 21
FASTEST MILE FOR YESTERDAY………………….20 WSW AT  12:00 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….22 N   AT  12:00 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………25 W   AT  12:00 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..11.6 W
ASOS…………………..11.9
DAVIS………………….11.9 WSW [248 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.31  DEPARTURE……+0.15
ASOS…………..0.33
TOTAL PRECIPITATION FOR THE MONTH……….5.87  DEPARTURE……+1.94
ASOS…………..5.94
TOTAL PRECIPITATION FOR THE YEAR……….53.07  DEPARTURE……+9.79
ASOS………….54.94

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 65/53/59/+2/0.22/042/06         21 ENE AERO 18 SSW RMY N/A
10/02 64/53/59/+2/0.77/000/00         33 S   AERO 32 S   RMY 35 TSTM
10/03 60/52/56/0/0.33/000/00          18 NNE AERO 14 NNE RMY 14
10/04 69/57/63/+7/0.00/204/30         29 SSW AERO 29 SSW RMY 32
10/05 64/47/56/0/0.00/618/92          25 NE  AERO 21 NE  RMY 24
10/06 64/45/55/0/0.00/264/40          23 SSW AERO 23 SSW RMY 25
10/07 75/56/66/+11/0.05/072/11        28 NE  AERO 24 ENE RMY 27
10/08 56/53/55/+1/0.03/000/00         22 ENE AERO 20 ENE RMY N/A
10/09 75/56/66/+12/0.00/204/31        26 WSW AERO 28 SW  RMY 29
10/10 82/65/74/+20/0.00/480/73        24 WSW AERO 23 WSW RMY 25
10/11 70/56/63/+10/0.78/000/00        48 NNE AERO 47 NNE RMY 50
10/12 59/44/52/-1/0.31/174/27         32 NW  AERO 32 NW  RMY 33
10/13 49/40/45/-8/0.17/108/17         21 WNW AERO 20 WNW RMY 20
10/14 55/37/46/-6/0.00/120/19         21 W   AERO 18 W   RMY 21
10/15 66/44/55/+3/0.06/030/05         46 W   AERO 46 W   RMY N/A
10/16 56/41/49/-2/0.03/606/94         48 W   AERO 48 W   RMY N/A
10/17 60/39/50/-1/0.01/564/89         48 W   AERO 50 W   RMY 53
10/18 45/33/39/-12/…./…/..        32 WNW AERO 35 WNW RMY 36
10/19 60/31/46/-4/…./…/..         33 SSW AERO 36 SSW RMY 36
10/20 62/46/54/+4/…./…/..         35 SSW AERO 37 SSW RMY 33
10/21 46/31/39/-11/…./…/..        39 NNW AERO 41 NW  RMY 41
10/22 50/27/39/-10/…./…/..        24 W   AERO 22 W   RMY 21
10/23 53/40/47/-2/…./…/..         29 WNW AERO 29 WNW RMY 29  TSTM
10/24 45/35/40/-9/…./…/..         31 NW  AERO 31 NW  RMY 32
10/25 48/32/40/-9/…./…/..         35 NW  AERO 35 NW  RMY 36
10/26 45/27/36/-12/…./…/..        20 NW  AERO 19 NW  RMY N/A
10/27 48/38/43/-5/…./…/..         54 NE  AERO 55 NE  RMY 55
10/28 51/40/46/-2/…./…/..         23 NNE AERO 23 NNE RMY N/A TSTM
10/29 55/40/48/+1/…./…/..         30 WSW AERO 30 WSW RMY 34

10/30 Low temp since midnight is 36F; normal low is 38F

DAILY RECORDS FOR OCTOBER

10/10/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 65F,
BREAKS PREVIOUS RECORD OF 62F SET IN 1949

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

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

RECORDS FOR OCTOBER 31
HIGH 79F IN 1946
LOW 22F IN 1904
PRECIP 3.74 INCHES IN 1991
SNOWFALL TRACE IN 1906
PEAK GUST 70e S IN 1945

TODAY’S REPORT PREPARED BY: Benjamin Turner