BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JANUARY 13, 2010
ALL TIMES ARE IN EASTERN STANDARD TIME 
 
TEMPERATURES TURN COLDER AGAIN
 
Temperatures dropped to 9 degrees (down from 12 degrees
last night at midnight) and have only reached the upper
20’s early this afternoon. This continues the colder than 
normal trend for the first two weeks of January.
 
Today's observations:
 
7 A.M.
Weather: Scattered altostratus and cirrus radiatus, stratocumulus
layer distant offshore northeast thru southeast 
Temperature: 10F, Dew point: 0F, Wind: W at 13 kts
Sea-level pressure: 30.05 inches Hg, rising 
Visibility: 50 miles   
6-hour minimum temp: 9F
Average snow depth: 6 inches
BHO SA 1155 180 SCT 200 SCT 250 SCT 50 176/10/0/2813/005/
SC LYR DSNT OFFSHR NE-SE/ 8/011 4/006 53009 10011 20009
 
10 A.M.
Weather: Clear, distant altocumulus, altocumulus lenticularis,
cirrus and a few dense cirrus 
Temperature: 19F, Dew point: -3F, Wind: WNW at 16G23 kts,
Wind: Direction variable WSW to NW 
Sea-level pressure: 30.11 inches Hg, rising
Visibility: 55 miles 
BHO SA 1455 CLR 55 194/19/-3/2916G23/011/ FEW AC/ACSL/CI/DENS CI 
DSNT ALQDS WND 25V31/ 8/042 51018
 
1 P.M.
Weather: Scattered dense cirrus, broken cirrus and a few
altocumulus and altocumulus lenticularis
Temperature: 27F, Dew point: -3F, Wind: WNW at 16G23 kts,
Wind: Direction variable WSW to NW  
Sea-level pressure: 30.06 inches Hg, falling
Visibility: 60 miles
6-hourly max. temp: 28F
BHO SA 1755 220 SCT 250 BKN 60 180/27/-3/2916G23/006/
FEW AC/ACSL DENS CI SW-NW AND DSNT E WND 25V32/
8/046 58014 10028 20010 
 
WEATHER SUMMARY FOR TUESDAY, JANUARY 12
 
TEMPERATURE (DEGREES F)
MAX.....32     NORMAL.....34
MIN.....12     NORMAL.....18
MEAN....22     NORMAL.....26
 
DEPARTURE FROM 30-YEAR AVERAGE.............-4
TOTAL DEPARTURE FOR THE MONTH.............-44 [-3.9 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............43    DEPARTURE........+4
TOTAL HEATING UNITS FOR THE MONTH...........507    DEPARTURE.......+45
TOTAL HEATING UNITS FOR THE SEASON.........2751    DEPARTURE.......-40
TOTAL HEATING UNITS LAST SEASON TO DATE....2731    DIFFERENCE......+20
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............36 WNW AT  9:01 P.M.   
                   AEROVANE..............36 W   AT  9:01 P.M.     
                   ASOS..................36 WNW AT  9:01 P.M.    
                   DAVIS.................36 WNW AT  9:00 P.M.   
THE FASTEST MILE FOR YESTERDAY...........26 NW  AT  9:00 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE............25 NW  AT  9:01 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE...........27 WNW AT  9:05 P.M.   
AVERAGE WIND SPEED AND DIRECTION.......13.5 W
                   ASOS................13.0 
                   DAVIS...............13.6 W [280 DEG]
* last of several occurrences...
    
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..........0.84   DEPARTURE....-1.00
                         ASOS..............0.74 
TOTAL PRECIPITATION FOR THE YEAR...........0.84   DEPARTURE....-1.00
                         ASOS..............0.74
                 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.....-0.5
TOTAL SNOWFALL FOR THE MONTH...............10.7  DEPARTURE.....+4.7
TOTAL SNOWFALL FOR THE SEASON..............40.5  DEPARTURE....+20.9
                                               
PRELIMINARY CLIMATE SUMMARY FOR JANUARY 2010 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
 
1/1  31/23/27/0/0.01/0.1/005/01    24 NW 
1/2  28/19/24/-3/0.45/.../000/00   53 W    AERO 55 W
1/3  25/13/19/-8/0.34/.../000/00   45 W    AER0 44 W
1/4  32/20/26/-1/0/0/397/72        35 W    AERO 28 W
1/5  29/18/24/-3/0/0/000/00        29 WNW
1/6  30/17/24/-2/0/0/554/100       33 W
1/7  37/21/29/+3/0/0/549/99        31 W
1/8  25/16/21/-5/0.04/0.6/000/00   22 WNW
1/9  25/10/18/-8/0/0/557/100       31 WNW
1/10 26/5/16/-10/0/0/508/91        23 WNW
1/11 33/12/23/-3/0/0/526/94        21 W
1/12 32/12/22/-4/0/0/.../..        36 WNW  AERO 33 WNW 
 
1/13 our morning low temp: 9F; the normal low is now 18F
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JANUARY 13
HIGH 57F IN 1890,1932
LOW -10F IN 1912,1914
PRECIP 1.54 INS. IN 1979
SNOWFALL 12.6 INS. IN 1964
PEAK GUST 74 MPH NE IN 1964
 
RECORDS FOR JANUARY 14
HIGH 65F IN 1995
LOW -12F IN 1914
PRECIP 1.45 INS. IN 2008
SNOWFALL 10.3 INS. IN 2008
PEAK GUST 68 MPH WNW IN 1976, S IN 2005
 
TODAY'S REPORT PREPARED BY: Robert Skilling