BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, OCTOBER 14, 2009  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
OUR FIRST FREEZE AND FROST OF THE SEASON
WAS ABOUT ONE WEEK EARLIER THAN AVERAGE
THERE WAS LOTS OF FROST AROUND THE SUMMIT
 
Our morning low temperature of 32.0F in the
Hazen shelter was the first freeze of the
season to date, and this was about a week
earlier than the average date of October 20th.
In addition, the low of 32F was only four
degrees short of the record low temperature
for this date of 28F in 1958.
 
Today's observations:
 
7 A.M.
Weather: Clear, few stratocumulus and few moderate
cumuloform tops along and offshore ENE-SE, few
stratocumulus along horizon distant WNW-NW 
Temperature: 35F, Dew point: 31F, Wind: WNW at 10 kts
Sea-level pressure: 30.20 inches Hg, rising
Visibility: 70 miles
6-hour minimum temp: 32F
24-hour precip: 0.13 inch
BHO SA 1155 CLR 70 227/35/31/2910/020/ FEW SC ALG/OFFSHR 
FEW MDT CUFRM TOPS FEW SC DSNT WNW-NW ALG HRZN MTN INCLD
70 NW FROST/ 8/500 51014 MANUAL 70013 ASOS 70014 10035 20032
 
10 A.M.
Weather: Scattered stratocumulus, moderate cumuloform tops
along and offshore northeast thru southeast  
Temperature: 44F, Dew point: 29F, Wind: NW at 12G22 kts,
Sea-level pressure: 30.21 inches Hg, rising
Visibility: 75 miles
BHO SA 1455 CLR 75 229/44/29/3212G22/021/ SC FRMG ALQDS 
FEW MDT CUFRM TOPS ALG/OFFSHR NE-SE WND 28V35/ 8/500 50002
 
1 P.M.   
Weather: Scattered cumulus and stratocumulus with a
few moderatue cumulus tops, scattered cirrus, the
high clouds are distant NW-N  
Temperature: 49F, Dew point: 29F, Wind: WNW at 8 kts,
Wind: Direction variable WSW to NNW
Sea-level pressure: 30.17 inches Hg, falling
Visibility: 80 miles
6-hour maximum temp: 50F
BHO SA 1755 44 SCT 250 SCT 80 216/49/29/3008/017/ FEW MDT CU 
TOPS CI DSNT NW-N WND 25V34/ 8/401 56013 10050 20035   
 
WEATHER SUMMARY FOR TUESDAY, OCTOBER 13
 
TEMPERATURE (DEGREES F)
MAX.....51    NORMAL.....61
MIN.....36    NORMAL.....44
MEAN....44    NORMAL.....52
 
DEPARTURE FROM 30-YEAR AVERAGE...........-8
TOTAL DEPARTURE FOR THE MONTH...........-22 [-1.9 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............21  DEPARTURE.......+8
TOTAL HEATING UNITS FOR THE MONTH...........157  DEPARTURE......+18
TOTAL HEATING UNITS FOR THE SEASON..........309  DEPARTURE.......+6
TOTAL HEATING UNITS LAST SEASON TO DATE.....237  DIFFERENCE.....+77
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............35 WNW AT  6:03 P.M. *   
                   AEROVANE..............31 WNW AT  6:03 P.M.  
                   ASOS..................33 W   AT  4:59 P.M.   
                   DAVIS.................34 NW  AT  5:56 P.M.  
FASTEST MILE FOR YESTERDAY...............25 NW  AT  6:04 P.M. * 
MAXIMUM 2-MINUTE ASOS AVERAGE............22 NW  AT  6:06 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE...........24 WNW AT  6:04 P.M.   
AVERAGE WIND SPEED AND DIRECTION.......11.0 WNW
                   ASOS................11.0
                   DAVIS...............10.7 W [280 DEG]
 
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.13   DEPARTURE....-0.01
                         ASOS..............0.14
TOTAL PRECIPITATION FOR MONTH..............2.31   DEPARTURE....+0.49
                         ASOS..............2.34
TOTAL PRECIPITATION FOR THE YEAR..........40.19   DEPARTURE....+0.77
                         ASOS.............41.40
 
PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
10/1  56/39/48/-9/0/155/22     27 WSW 
10/2  60/40/50/-6/0/442/63     23 SSE 
10/3  63/51/57/+1/1.10/000/00  32 ESE  AERO 30 MPH ESE 
10/4  67/57/62/+6/0/202/29     21 WSW
10/5  64/49/57/+2/0/595/86     33 W    AERO 31 MPH W
10/6  65/45/55/0/0/628/91      25 W
10/7  67/51/59/+4/0.70/344/50  54 W    AERO 54 MPH W
10/8  61/48/55/+1/0/602/88     43 W    AERO 39 MPH W
10/9  60/48/54/0/0.05/000/00   29 SSE
10/10 62/42/52/-2/0.26/205/30  37 NW
10/11 61/39/50/-3/0/655/97     35 WSW  AERO 33 MPH W 
10/12 53/36/45/-8/.../.../..   23 SSW
10/13 51/36/45/-8/0.20/074/11  35 WNW 
 
10/14 our morning low temp: 32F; our normal low temp: 43F
 
NEW DAILY RECORDS FOR OCTOBER 2009
10/7: NEW RECORD WIND GUST 54 MPH W AT 2005E;
      surpasses previous record of 52 MPH ESE in 1972
  
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR OCTOBER 14
HIGH 79F IN 2000
LOW 28F IN 1958
PRECIP 2.69 INCHES IN 1990
SNOWFALL 2.0 INCHES IN 1913
PEAK GUST 63e W IN 1976
 
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
 
TODAY'S REPORT PREPARED BY: Robert Skilling