BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, OCTOBER 12, 2012 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
COLDEST WEATHER OF THE SEASON EXPECTED
A RECORD LOW TEMPERATURE FOR OCTOBER 13 WOULD BE
FIRST RECORD LOW FOR THE MONTH IN 19 YEARS!
RAIN SHOWERS MID-LATE MORNING LEAVE 0.04 INCH
 
The coldest weather of the season is expected late this
week.  Our record low temperature for Saturday, October
13th is 30F first recorded in 1934 and equaled in 1936
and again in 1988.  It has been a long time since a
record low temperature has been recorded here. For the
month of October the last record low temperature was
on October 11, 1993, at 28 degrees. No record low
temperatures have been recorded for any month since
two were recorded in March 2007.
 
Today's observations:
 
7 A.M.
Weather: Clear, patches of altocumulus lenticularis and
altocumulus (2 levels), patches of cirrus (2 levels) mostly
overhead through W-N 
Temperature: 44F; Dew Point: 36F; Wind: WSW at 12 kts,
Wind: Direction variable SSW-W
Sea-level pressure: 30.03 ins. Hg, falling then rising slightly  
Visibility: 40 miles, WNW 45 miles, distant haze
24-hour precip: 0.00
6-hour min. temp: 43F
BHO SA 1155 CLR 40 168/44/36/2412/003/ PTCHS ACSL/AC (2 LVLS)
FEW PTCHS CI (2 LVLS) MSTLY OVHD-DSNT W-N VSBY WNW 45 DSNT HZ
WND 20V27/ 8/041 55001 10046 20043
 
10 A.M. 
Weather: Overcast stratocumulus, higher altocumulus visible and break in
the overcast distant E-S 
Temperature: 45F; Dew Point: 41F; Wind: NW at 11G22 kts,
Wind: Direction variable W to NNW
Wind: Direction gradually veering   
Sea-level pressure: 30.08 ins. Hg, rising, then more rapidly   
Visibility: 30 miles, WSW-WNW 20, NW-NNE 15, lowering,
visibiity SE 40 miles
3-hour precip: trace
BHO SA 1455 E30 OVC 30RW- 187/45/41/3211G22/008/ HIER AC CLDS AND BINOVC DSNT E-S
VSBY WSW-WNW 20 NW-NNE 15 LWRG VSBY SE 40 WND 27V34 WND GRDLY VEERING RB35/
8/55/ 53019 MANUAL 6000/ 
 
1 P.M. 
Weather: Overcast stratocumulus with lower cumulus, moderate cumulus
west thru north, break in overcast WSW-NNE, shower of rain began at
12:35 and ended 12:53 P,N, EST, showers of rain E-ESE moving E  
Temperature: 44F; Dew Point: 41F; Wind: NW @ 9 kts,
Sea-level pressure: 30.09 ins. Hg, rising slightly 
Visibility: 70 miles, except 10 miles E-ESE, 20 SE
and 35 miles, S, and 80 miles NW   
6-hour precip: 0.04 in.
6-hour max. temp: 51F  
BHO SA 1755 E26 BKN 38 OVC 70 189/44/41/3209/009/ LWR CU/
MDT CU DSNT WSW-N BINOVC W-NNE SHRA ENE-SE MOVG E VIRGA DSNT S 
VSBY E-ESE 10 SE 20 S 35 NW 80 WND 27V01 RB35E53/ 8/8// 53002
MANUAL 6004/ ASOS 60004 10051 20043
 
WEATHER SUMMARY FOR THURSDAY, OCTOBER 11

TEMPERATURE (DEGREES F)
MAX.....58   NORMAL.....62
MIN.....41   NORMAL.....45
MEAN....50   NORMAL.....53
 
DEPARTURE FROM 30-YEAR NORMAL.....................-3
TOTAL DEPARTURE FOR THE MONTH....................+16 [+1.3 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............15    DEPARTURE........+3
TOTAL HEATING UNITS FOR THE MONTH............93    DEPARTURE.......-19
TOTAL HEATING UNITS FOR THE SEASON..........192    DEPARTURE.......-63
TOTAL HEATING UNITS LAST SEASON TO DATE.....143    DIFFERENCE......+49
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............35 WNW AT 11:30 A.M.  
                   AERO..................33 WNW AT 11:30 A.M.  
                   ASOS..................32 WNW AT 11:30 A.M.  
                   DAVIS.................31 WNW AT 11:30 A.M. RMY 34 
THE FASTEST MILE FOR YESTERDAY...........23 WNW AT 11:30 A.M.    
MAXIMUM 2-MINUTE ASOS AVERAGE............23 WNW AT 11:33 A.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE...........22 WNW AT 11:33 A.M.  
AVERAGE WIND SPEED AND DIRECTION.......14.5 W
                   ASOS................13.8
                   DAVIS...............12.7 W [260 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE...........-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.79   DEPARTURE...........-0.84
                         ASOS..............0.74
TOTAL PRECIPITATION FOR THE YEAR..........29.41   DEPARTURE..........-11.30
                         ASOS.............29.29
 
PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 2012 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
10/1  66/47/57/0/T/429/61             36 W   AERO 35 MPH WSW RMY 36
10/2  69/53/61/+4/0.12/098/14         18 W   AERO 16 MPH W   RNT 16
10/3  62/58/60/+4/0.02/000/00         20 NE  AERO 18 MPH NE  RMY 18
10/4  61/58/60/+4/0.08/000/00         17 NNE AERO 14 MPH NE  RMY 14
10/5  75/57/66/+10/0.00/623/90        20 SW  AERO 19 MPH SW  RMY 21
10/6  77/48/63/+8/0.20/269/39         36 SSW AERO 37 MPH SSW RMY 36 TSTM
10/7  57/44/51/-4/0.15/105/27         21 WNW AERO 18 MPH WNW RMY 19
10/8  55/40/48/-6/0.00/328/48         17 WNW AERO 15 MPH WNW RMY N/A
10/9  56/49/53/-1/T/000/00            27 E   AERO 25 MPH ENE RMY 25
10/10 60/47/54/0/0.22/000/00          36 WNW AERO 36 MPH WNW RMY 31
10/11 58/41/50/-3/0.00/668/99         35 WNW AERO 33 MPH WNW RMY 34
 
10/12 our  morning low temp: 43F; the normal low is now 44F
 
DAILY RECORDS FOR OCTOBER 2012
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR OCTOBER 12
HIGH 87F IN 1954
LOW 31F IN 1906
PRECIP 1.53 INCHES IN 1948
SNOWFALL TRACE IN 1941
PEAK GUST 55 MPH NW IN 1963
 
RECORDS FOR OCTOBER 13
HIGH 84F IN 1930,1954
LOW 30F IN 1934,1936,1988
PRECIP 5.92 INCHES IN 1895
SNOWFALL 4.2 INCHES IN 1934
PEAK GUST 46e MPH W IN 1950
 
TODAY'S REPORT PREPARED BY: Robert Skilling