Wednesday, October 31, 2018
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, OCTOBER 31, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME
A COOL AND DRY AUTUMN DAY WITH PRESSURE DROPPING
AND CLOUDS BUILDING THROUGHOUT THE DAY
The day began with clear skies and cold temperatures,
with the minimum temperature just breaking the freezing
point at 31.7 F during the morning hours today.
Pressure readings crested during the morning, with
the reversal of the pressure trend evident in the the
10 A.M. observation. Coupled with falling pressure, cloud
activity has risen throughout the day with coverage trending
towards an overcast sky. So far, daytime heating has been
significant, with a maximum temperature of 50 F reached by
the time of the 1 P.M. observation. This value still remains
well below our seasonal average of 55 F, capping off a
colder than average October emphatically.
Today’s Observations:
7 A.M.
Weather: Few distant cumulus, few distant cirrostratus
Temperature: 35F; Dew Point: 29F; Wind: NNW at 4 kts
Sea-level pressure: 30.13 ins. Hg, rising rapidly
Visibility: 80 miles
6-hr Max temp: 35F
6-hr Min temp: 32F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 80 202/35/29/3304/013/
FEW DSNT CU NE-E FEW DSNT CS N-W WND LGT/
8/108 53009 10035 20032
10 A.M.
Weather: Broken altocumulus, thin layer of smoke
Temperature: 44F; Dew Point: 31F; Wind: SSW at 5 kts
Sea-level pressure: 30.11 ins. Hg, falling steadily
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E100 BKN 75 197/44/31/2005/011/
THN K LYR SW-NE WND LGT/ 8/070/ 58005
1 P.M.
Weather: Broken altocumulus
Temperature: 50F; Dew Point: 34F; Wind: S at 9G14 kts,
Sea-level pressure: 30.01 ins. Hg, falling rapidly
Visibility: 70 miles
6-hr Max temp: 50F
6-hr Min temp: 35F
6-hr Precip: 0.00 ins.
BHO SA 1755 E70 BKN 70 164/50/34/2009G14/001/
8/090/ 58033 10050 20035
SUMMARY FOR TUESDAY, OCTOBER 30, 2018
TEMPERATURE (DEGREES F)
MAX…..45 NORMAL…..56
MIN…..34 NORMAL…..38
MEAN….40 NORMAL…..47
DEPARTURE FROM 30-YEAR NORMAL…………………..-7
TOTAL DEPARTURE FOR THE MONTH………………….-28 [-1.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..25 DEPARTURE………+7
TOTAL HEATING UNITS FOR THE MONTH………….436 DEPARTURE……..+33
TOTAL HEATING UNITS FOR THE SEASON…………523 DEPARTURE……..-22
TOTAL HEATING UNITS LAST SEASON TO DATE…….253 DIFFERENCE……+270
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………………..28 NW AT 10:56 A.M.
AERO…………………….28 NW AT 10:47 A.M.
ASOS…………………….29 NW AT 10:56 A.M.
DAVIS……………………28 W AT 2:13 A.M. RMY 30
FASTEST MILE FOR YESTERDAY………………….21 NW AT 3:22 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 NW AT 3:18 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………21 NW AT 10:57 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..12.3 WNW
ASOS…………………..12.4
DAVIS………………….12.7 WNW [301 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……….5.87 DEPARTURE……+1.18
ASOS…………..5.94
TOTAL PRECIPITATION FOR THE YEAR……….53.07 DEPARTURE……+9.48
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 45/34/40/-7/…./…/.. 28 NW AERO 28 NW RMY 30
10/31 Low temp since midnight is 32F; 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 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
RECORDS FOR NOVEMBER 1
HIGH 75 IN 2003
LOW 22 IN 1913,1923
PRECIP 2.93 INCHES IN 1985
SNOWFALL TRACE IN 1906,1951
PEAK GUST 78 ESE IN 1997
TODAY’S REPORT PREPARED BY: Nate Iannuccillo
