BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JANUARY 21, 2009 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
7 A.M.
Weather: Clear, few stratocumulus distant E-S
Temperature: 10F, Dew point: 5F, Wind: WNW at 9 kts
Sea-level pressure: 29.79 inches Hg, rising
Visibility: 12 miles, thin fog/haze
6-hour minimum temperature: 10F
Snow depth on ground: 15 inches
BHO SA 1155 CLR 12 088/10/5/2909/979/ FEW SC DSNT E-S THN FH/
8/500 4/015 53023 10016 20010
 
10 A.M.
Weather: Clear, hazy
Temperature: 16F, Dew point: 7F, Wind: W at 11 kts
Sea-level pressure: 29.84 inches Hg, rising
Visibility: 12 miles, hazy
BHO SA 1455 CLR 12 105/16/7/2711/984/ HAZY/ 51017
 
1 P.M.  
Weather: Clear, few stratocumulus distant W-NW,
altocumulus/lenticularis SW-NW
Temperature: 23F, Dew point: 6F, Wind: W at 11 kts
Sea-level pressure: 29.78 inches Hg, falling
Visibility: 30 miles, hazy 
6-hour maximum temperature: 23F
BHO SA 1755 CLR 30 085/23/6/2811/978/ FEW SC DSNT W-NW
AC/ACSL SW-NW K LYR N-SE LGT HZ/ 8/540 58020 10023 20009
 
WEATHER SUMMARY FOR TUESDAY, JANUARY 20
 
TEMPERATURE (DEGREES F)
MAX.....30    NORMAL.....33 
MIN.....17    NORMAL.....17
MEAN....24    NORMAL.....25
 
DEPARTURE FROM 30-YEAR NORMAL...............-1
TOTAL DEPARTURE FOR THE MONTH..............-85  [-4.5 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............41  DEPARTURE.........+2
TOTAL HEATING UNITS FOR THE MONTH............862  DEPARTURE........+88
TOTAL HEATING UNITS FOR THE SEASON..........3102  DEPARTURE.........-1
TOTAL HEATING UNITS LAST SEASON TO DATE.....2816  DIFFERENCE......+286
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............30  NW AT   9:14 P.M.
                   AEROVANE.............28  NW AT   9:14 P.M.
                   ASOS.................29 NNW AT   9:14 P.M.
                   DAVIS................31 WNW AT   9:14 P.M.
FASTEST MILE FOR YESTERDAY..............21  NW AT   9:12 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...........20 NNW AT   9:14 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........21 WNW AT   9:10 P.M.
                   AVERAGE.............9.5 NW
                   ASOS................9.6
                   DAVIS...............9.9 NW [307 deg]  
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....TRACE  DEPARTURE.........-0.16
                         ASOS...............0.00
TOTAL PRECIPITATION FOR THE MONTH...........2.86  DEPARTURE.........-0.26
                         ASOS...............3.94 #
TOTAL PRECIPITATION FOR THE YEAR............2.86  DEPARTURE.........-0.26
                         ASOS...............3.94 #
# Includes erroneous ASOS precipitation data on 1/1/09 and 1/2/09
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M........TRACE   DEPARTURE.........-0.5
TOTAL SNOWFALL FOR THE MONTH...............20.6   DEPARTURE........+10.6
TOTAL SNOWFALL FOR THE SEASON..............51.0   DEPARTURE........+27.4
 
PRELIMINARY CLIMATE SUMMARY FOR JANUARY 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system gust when significant
   TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
1/1  16/1/9/-18/0/0/538/98           44 WNW   Aero 44 MPH WNW
1/2  32/9/21/-6/0/0/005/01           28 S
1/3  32/21/27/0/T/T/539/98           43 WNW   Aero 44 MPH WNW
1/4  35/17/26/-1/0/0/512/93          36 W     Aero 33 MPH W
1/5  36/26/31/+4/0.06/0/512/93       30 W   
1/6  33/21/27/+1/0/0/183/33          27 W 
1/7  36/26/31/+5/1.26/0.8/000/00     46 NE    Aero 45 MPH NE
1/8  38/21/30/+4/0.01/0.1/389/70     47 W     Aero 45 MPH W
1/9  25/16/21/-5/0/0/546/98          37 W     Aero 36 MPH W
1/10 24/11/18/-8/0.10/1.0/329/59     28 W
1/11 31/19/25/-1/0.55/5.3/000/00     30 NW
1/12 27/18/23/-3/0.02/0.4/410/73     24 WNW
1/13 34/16/25/-1/0.04/T/107/19       25 SE
1/14 33/10/22/-4/0/0/518/92          47 W     Aero 48 MPH W
1/15 16/5/11/-15/0/0/000/00          20 NW
1/16 17/0/9/-17/0/0/557/98           26 W
1/17 19/1/10/-16/0/0/450/79          23 W
1/18 29/14/22/-4/0.58/9.5/000/00     24 E
1/19 32/19/26/+1/0.24/3.5/057/10     18 NW
1/20 30/17/24/-1/T/T/.../..          30 NW
 
1/21 morning low temp: 9F our normal low temp. is now 17F
    
NEW DAILY RECORDS FOR JANUARY 2009...
 
..NONE..
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JANUARY 21
HIGH 65F IN 1906
LOW -4F IN 1888,1893
PRECIP 2.49 INS. IN 1979
SNOWFALL 7.5 INS. IN 2001
PEAK GUST 78e MPH SE IN 1979
 
RECORDS FOR JANUARY 22
HIGH 59F IN 1916
LOW -8F IN 1888,1976
PRECIP 1.24 INS. IN 1891,1987
SNOWFALL 10.0 INS. IN 2005
PEAK GUST 67 MPH W IN 1976
 
TODAY'S REPORT PREPARED By: Stephanie Radner