BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JANUARY 13, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
EARLY SUNSHINE GIVES WAY TO AN OVERCAST SKY
MILDER TEMPERATURES ARRIVE ON SOUTHEAST WINDS
 
Early morning sunshine occurred through high
cirrus clouds but thickening clouds had blocked
out all of the sunshine by mid-morning.  Temperatures
out were on the rise from 16F early this morning to
the 30-degree mark by early afternoon.  Southwest
winds early this morning backed around to southeast
by 7 a.m. and are continuing as the barometric
pressure falls increasingly more rapidly going down
4 millibars between 10 a.m. and 1 p.m.
 
 
7 A.M.
Weather: High overcast cirrus, thin spots in overcast and
breaks in overcast SE-S, hazy
Temperature: 18F, Dew point: 13F, Wind: SSE at 10 kts
Sea-level pressure: 30.26 inches Hg, falling 
Visibility: 20 miles, hazy
6-hour minimum temperature: 16F
24-hour precip: 0.01 in.
24-hour snowfall: 0.2 ins.
Snow depth on ground: 8 inches
BHO SA 1155 E220 BKN 250 OVC 20 246/18/13/1510/026/
OVC PTLY THN BINOVC SE-S HAZY WND GRDLY BACKING
TOTAL NEW SNW PST 24 HRS 0.2 IN/ 8/007 4/008
58006 ASOS 70001 MANUAL 70001 10019 20016
 
10 A.M.
Weather: Scattered altocumulus, thin overcast cirrus,
stratocumulus SE thru W, hazy
Temperature: 26F, Dew point: 19F, Wind: SE at 12 kts
Sea-level pressure: 30.21 inches Hg, falling
Visibility: 20 miles, northeast 35 miles, hazy in all
quadrants 
BHO SA 1455 130 SCT 220 SCT 250 –OVC 20 231/26/19/1312/021/
SC SE-W VSBY NE 35 HAZY ALQDS/ 8/537 56015
 
1 P.M.
Weather: Broken altostratus, overcast dense cirrostratus,
stratocumulus NE-SE-SSW, sun occasionally dimly visible
Temperature: 30F, Dew point: 24F, Wind: SE at 11 kts
Sea-level pressure: 30.09 inches Hg, falling
Visibility: 25 miles, hazy
6-hour maximum temperature: 30F
BHO SA 1755 E130 BKN 200 OVC 25 189/30/24/1411/009/
SC NE-SE-SSW SUN OCNL DMLY VSB HAZY/ 8/517
58042 10030 20018
 
WEATHER SUMMARY FOR MONDAY, JANUARY 12
 
TEMPERATURE (DEGREES F)
MAX.....27    NORMAL.....34 
MIN.....18    NORMAL.....18
MEAN....23    NORMAL.....26
 
DEPARTURE FROM 30-YEAR NORMAL...............-3
TOTAL DEPARTURE FOR THE MONTH..............-28  [-2.5 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............42  DEPARTURE.........+3
TOTAL HEATING UNITS FOR THE MONTH............491  DEPARTURE........+29
TOTAL HEATING UNITS FOR THE SEASON..........2731  DEPARTURE........-60
TOTAL HEATING UNITS LAST SEASON TO DATE.....2522  DIFFERENCE......+209
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............24 WNW AT 12:43 P.M.  
                   AEROVANE.............23 WNW AT 12:53 P.M.  
                   ASOS.................23 WNW AT  1:00 P.M.      
                   DAVIS................23 WNW AT 12:43 P.M.       
FASTEST MILE FOR YESTERDAY..............16  W  AT  1:10 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE...........17 WNW AT 12:58 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE..........18 WNW AT  1:08 P.M.          
                   AVERAGE............ 9.4 W
                   ASOS................9.4
                   DAVIS...............9.6 W [280 deg]  
* last of several occurrences....
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.01  DEPARTURE.........-0.15
                         ASOS...............0.01
TOTAL PRECIPITATION FOR THE MONTH...........2.00  DEPARTURE.........+0.16
                         ASOS...............2.98 #
TOTAL PRECIPITATION FOR THE YEAR............2.00  DEPARTURE.........+0.16
                         ASOS...............2.98 #
# 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..........0.2   DEPARTURE.........-0.3
TOTAL SNOWFALL FOR THE MONTH................7.6   DEPARTURE.........+1.6
TOTAL SNOWFALL FOR THE SEASON..............38.0   DEPARTURE........+18.4
 
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 
1/8  38/21/30/+4/0.01/0.1/389/70 *   47 W
1/9  25/16/21/-5/0/0/546/98          37 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
 
* daily precip. and snowfall have been changed:
  1/7 was 1.27/0.9 and is corrected to: 1.26/0.8
  1/8 was zero is now 0.01/0.1
 
1/13 morning low temp. 16F; our normal low is now 18F
    
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 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