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