BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JANUARY 9, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
7 A.M.
Weather: Clear, stratocumulus distant NE-SE,
few altocumulus/lenticularis SW-NW
Temperature: 16F, Dew point: 7F, Wind: W at 11 kts
Sea-level pressure: 29.73 inches Hg, rising
Visibility: 55 miles
6-hour minimum temperature: 16F
Snow depth on ground: 3 inches
BHO SA 1155 CLR 55 069/16/7/2611/973/ SC DSNT NE-SE
FEW AC/ACSL SW-NW/ 8/540 4/003 53027 10020 20016
 
10 A.M.
Weather: Clear, stratocumulus distant NE-SE,
few altocumulus/lenticularis W-NW
Temperature: 20F, Dew point: 8F, Wind: W at 12G22 kts
Wind: Peak gust past hour 28 kts W at 9:32 A.M.
Wind: Direction variability SW-NW
Sea-level pressure: 29.83 inches Hg, rising
Visibility: 75 miles
BHO SA 1455 CLR 75 100/20/8/2612G22/983/ SC DSNT NE-SE
FEW AC/ACSL W-NW PK WND 2628/32/ WND 22V34/ 8/540 51031
 
1 P.M.
Weather: Scattered stratocumulus
Temperature: 25F, Dew point: 10F, Wind: W at 21G30 kts
Wind: Peak gust past hour 30 kts W at 12:52 P.M.
Sea-level pressure: 29.72 inches Hg, falling
Visibility: 75 miles
6-hour maximum temperature: 25F
BHO SA 1755 40 SCT 75 063/25/10/2621G30/972/
PK WND 2730/52/ 8/500 56006 10025 20016
 
WEATHER SUMMARY FOR THURSDAY, JANUARY 8
 
TEMPERATURE (DEGREES F)
MAX.....38    NORMAL.....34 
MIN.....21    NORMAL.....18
MEAN....30    NORMAL.....26
 
DEPARTURE FROM 30-YEAR NORMAL...............+4
TOTAL DEPARTURE FOR THE MONTH..............-11  [-1.6 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............35  DEPARTURE.........-4
TOTAL HEATING UNITS FOR THE MONTH............318  DEPARTURE........+12
TOTAL HEATING UNITS FOR THE SEASON..........2558  DEPARTURE........-77
TOTAL HEATING UNITS LAST SEASON TO DATE.....2439  DIFFERENCE......+119
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............47  W   AT 10:19 P.M.   
                   AEROVANE.............45  W   AT 10:19 P.M.
                   ASOS.................47  W   AT 10:20 P.M.    
                   DAVIS................43  W   AT 10:19 P.M.     
FASTEST MILE FOR YESTERDAY..............33  W   AT 10:19 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE...........32 WNW  AT 10:21 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........31  W   AT 10:20 P.M.      
                   AVERAGE............21.5  SSW
                   ASOS...............19.7
                   DAVIS..............19.2  WSW  [240 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 JANUARY.............1.33  DEPARTURE.........+0.13
                         ASOS...............2.32 #
TOTAL PRECIPITATION FOR THE YEAR (2009).....1.33  DEPARTURE.........+0.13
                         ASOS...............2.32 #
# 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 JANUARY................  0.9   DEPARTURE.........-3.1
TOTAL SNOWFALL FOR THE SEASON..............31.3   DEPARTURE........+13.7
 
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/+5/1.27/0.9/000/00    46 NE 
1/8 38/21/30/+4/0/0/389/70         47 W
 
1/9 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 9
HIGH 62F IN 1937
LOW -9F IN 1968
PRECIP 3.00 INS. IN 1956
SNOWFALL 10.0 INS. IN 1904
PEAK GUST 101e MPH SE IN 1978 [RECORD FOR MONTH]
 
RECORDS FOR JANUARY 10
HIGH 54F IN 2000
LOW -7F IN 2004
PRECIP 2.16 INS. IN 1935
SNOWFALL 6.3 INS. IN 1977
WIND 73e SE IN 1977
 
TODAY'S REPORT PREPARED By: Stephanie Radner