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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, OCTOBER 15, 2015  
ALL TIMES ARE IN EASTERN STANDARD TIME

TEMPERATURES TREND COOLER OVERNIGHT WITH
A LOW THIS MORNING OF 41F

Above normal to seasonable warmth that has
been present for the past week or so in the
region is slowly giving way to cooler conditions
and eventually the coldest air of the season 
on tap for this weekend. Yesterday's maximum of 
66F, reached before noon EST, gave way to cool
and clear conditions overnight with a low this
morning of 41F. 

Excellent visibility has been present today, with
views of 80 to 85 miles for most of this morning
without many clouds visible. By the 1:00 PM EST
observation skies were still largely cloud free
with excellent visibility. A maximum temperature of
60F had been recorded so far.


Today's Observations:

7 A.M.
Weather: Clear, few stratocumulus distant offshore ENE-S
Temperature: 42F; Dew Point: 38F; Wind: W at 8 kts,
Sea-level pressure: 29.93 ins. Hg, rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 44F  
6-hr Min temp: 41F
24-hr precip: 0.00 ins.
BHO SA 1155 CLR 80 137/42/38/2808/993/ FEW SC DSNT OFFSHR 
ENE-S/ 8/500 51014 10044 20041

10 A.M.
Weather: Clear, few small cumulus in all directions
Temperature: 54F; Dew Point 36F; Wind: W at 8 kts, 
Sea-level pressure: 29.89 ins. Hg, rising, then falling, but higher still
Visibility: 80 miles
BHO SA 1455 CLR 80 121/54/36/2708/989/ FEW SML CU ALQDS/ 
8/100 50016

1 P.M.
Weather: Clear, few small cumulus ESE and SSW-NW
Temperature: 60F; Dew Point 38F; Wind: W at 8 kts,
Wind Direction: SW varying NW
Sea-level pressure: 29.84 ins. Hg, falling, then more quickly
Visibility: 80 miles 
6-hr Max temp: 60F
6-hr Min temp: 42F
BHO SA 1755 CLR 80 108/60/38/2708/984/ FEW SML CU ESE AND 
SSW-NW WND 22V28/ 8/100 58013 10060 20042


SUMMARY FOR WEDNESDAY, OCTOBER 14, 2015 
  
TEMPERATURE (DEGREES F)
MAX.....66   NORMAL.....61 
MIN.....46   NORMAL.....43 
MEAN....56   NORMAL.....52 
 
DEPARTURE FROM 30-YEAR NORMAL........................+4
TOTAL DEPARTURE FOR THE MONTH.......................+10  [+0.5 DEGREES/DAY]
 
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE...........0
TOTAL COOLING UNITS FOR THE MONTH...............0   DEPARTURE..........-4
TOTAL COOLING UNITS FOR THE SEASON............810   DEPARTURE........+209
TOTAL COOLING UNITS LAST SEASON TO DATE.......587   DIFFERENCE.......+223

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............9   DEPARTURE..........-4
TOTAL HEATING UNITS FOR THE MONTH.............134   DEPARTURE.........-17
TOTAL HEATING UNITS FOR THE SEASON............177   DEPARTURE........-116
TOTAL HEATING UNITS LAST SEASON TO DATE.......239   DIFFERENCE........-62
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................26 W    AT  4:46 P.M.* 
                   ASOS........................28 W    AT 10:02 A.M.  
                   DAVIS.......................27 W    AT 10:02 A.M. RMY 29
FASTEST MILE FOR YESTERDAY.................... 21 W    AT  4:47 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE..................21 W    AT  4:48 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE.................20 W    AT 10:03 A.M.   
AVERAGE WIND SPEED AND DIRECTION..............13.2 W 
                   ASOS.......................13.4    
                   DAVIS......................11.7 W [279 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...........1.06  DEPARTURE.....-1.01
                         ASOS...............1.04
TOTAL PRECIPITATION FOR THE YEAR...........34.46  DEPARTURE.....-5.95
                         ASOS................N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

10/1  55/51/53/-4/..../000/00               39 NE  RMY N/A
10/2  51/47/49/-8/..../000/00               40 NE  RMY 43 
10/3  51/45/48/-8/..../000/00               38 NE  RMY N/A 
10/4  55/49/52/-4/0.00/474/68               35 E   RMY 40
10/5  59/46/53/-3/T/125/18                  21 NE  RMY 20 
10/6  68/43/56/+1/0.00/663/96               17 NW  RMY 17
10/7  69/46/58/+3/0.00/640/93               20 W   RMY 20
10/8  63/49/56/+2/0.00/678/99               21 S   RMY N/A
10/9  68/50/59/+5/0.27/.../..               45 S   RMY 49
10/10 59/44/53/-2/0.00/.../..               33 NNW RMY N/A 
10/11 67/46/57/+4/0.00/.../..               26 SW  RMY 28
10/12 76/50/63/+10/0.00/.../..              22 SSW RMY 24
10/13 70/55/63/+10/0.27/.../..              23 S   RMY 24
10/14 66/46/56/+4/0.00/.../..               26 W   RMY 29

10/15 low since midnight is 41F; normal low is now 43F  

DAILY RECORDS FOR OCTOBER 2015

-NONE SO FAR.

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: Brian Fitzgerald