BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JANUARY 23, 2009 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.
Weather: Scattered altocumulus, scattered cirrus,
few lenticular E-SW
Temperature: 25F, Dew point: 19F, Wind: W at 8 kts
Sea-level pressure: 30.05 inches Hg, rising
Visibility: 10 miles, hazy
6-hour minimum temperature: 24F
Snow depth on ground: 14 inches
BHO SA 1155 140 SCT 250 SCT 10 176/25/19/2708/005/
FEW ACSL E-SW HAZY/ 8/041 4/014 53004 10025 20024
 
10 A.M.
Weather: Scattered cirrostratus, scattered cirrus,
patches dense cirrus
Temperature: 31F, Dew point: 21F, Wind: S at 5 kts
Wind: Light and variable, backing past hour
Sea-level pressure: 30.06 inches Hg, rising
Visibility: 10 miles, hazy
BHO SA 1455 200 SCT 250 SCT 10 179/31/21/1805/006/
PTCHS DENS CI HAZY WND LGT AND VRB WND BACKING PST HR/
8/002 50003
 
1 P.M.  
Weather: Broken cirrostratus, overcast cirrus,
partial halo, hazy
Temperature: 38F, Dew point: 23F, Wind: SSE at 8 kts
Wind: Variable direction SE-WSW
Sea-level pressure: 29.97 inches Hg, falling
Visibility: 10 miles, hazy 
6-hour maximum temperature: 38F
BHO SA 1755 E220 BKN 250 OVC 10 148/38/23/1608/997/
PARTIAL HALO HAZY WND 13V25/ 8/007 58031 10038 20025
 
WEATHER SUMMARY FOR THURSDAY, JANUARY 22
 
TEMPERATURE (DEGREES F)
MAX.....31    NORMAL.....33 
MIN.....14    NORMAL.....17
MEAN....23    NORMAL.....25
 
DEPARTURE FROM 30-YEAR NORMAL...............-2
TOTAL DEPARTURE FOR THE MONTH..............-96  [-4.6 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............42  DEPARTURE.........+2
TOTAL HEATING UNITS FOR THE MONTH............953  DEPARTURE........+99
TOTAL HEATING UNITS FOR THE SEASON..........3193  DEPARTURE........+10
TOTAL HEATING UNITS LAST SEASON TO DATE.....2904  DIFFERENCE......+289
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............31 SW  AT  3:25 P.M. *
                   AEROVANE.............31 SW  AT  3:24 P.M. *
                   ASOS.................31 WSW AT  3:24 P.M.
                   DAVIS................33 SW  AT  3:23 P.M.
FASTEST MILE FOR YESTERDAY..............26 SW  AT  3:25 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE...........25 WSW AT  3:25 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........24 SW  AT  3:25 P.M.
                   AVERAGE............14.9 SW
                   ASOS...............13.6
                   DAVIS..............13.7 SW [232 deg]  
* last of several occurrences
 
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...........2.86  DEPARTURE.........-0.57
                         ASOS...............3.94 #
TOTAL PRECIPITATION FOR THE YEAR............2.86  DEPARTURE.........-0.57
                         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..........0.0   DEPARTURE.........-0.5
TOTAL SNOWFALL FOR THE MONTH...............20.6   DEPARTURE.........+9.6
TOTAL SNOWFALL FOR THE SEASON..............51.0   DEPARTURE........+26.4
 
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/247/43          30 NW
1/21 23/9/16/-9/0/0/.../..           25 SW
1/22 31/14/23/-2/0/0/.../..          31 SW
 
1/23 morning low temp: 24F our normal low temp. 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 23
HIGH 62F IN 1906
LOW -10F IN 1976
PRECIP 2.40 INS. IN 1935
SNOWFALL 14.6 INS. IN 1966
PEAK GUST 85 MPH S IN 1992
 
RECORDS FOR JANUARY 24
HIGH 60F IN 1967
LOW -12F IN 1907
PRECIP 2.04 INS. IN 1998
SNOWFALL 11.3 INS. IN 1935
PEAK GUST 82 MPH S IN 1996
 
TODAY'S REPORT PREPARED By: Stephanie Radner