BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JANUARY 18, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
SUNDAY SNOW FOR SECOND CONSECUTIVE WEEK BRINGS 7.2 INCHES SO FAR...
 
7 A.M.
Weather: Obscured by fog and moderate snow
Temperature: 25F, Dew point: 23F, Wind: ESE at 15G19 kt
Sea-level pressure: 30.12 inches Hg, falling
Visibility: 1/4 of a mile
6-hour minimum temperature: 15F
24-hour snowfall: 2.3 inches
Snow depth on ground: 9 inches
BHO SA 1155 W2 X1 1/4SF 200/25/23/1115G19/012/
TOTAL NEW SNW PST 24 HR 2.3 IN/ 8//// 4/009 58037
6//// 70013 10025 20015
 
10 A.M.
Weather: Obscured by fog and heavy snow
Temperature: 26F, Dew point: 25F, Wind: W at 4 kt
Sea-level pressure: 30.06 inches Hg, falling
Visibility: 1/16 of a mile
BHO SA 1455 W2 X1 1/16SF 181/26/25/2704/006/
WND L/V/ 8//// 6//// 58019
 
1 P.M.  
Weather: Obscured by fog and moderate snow
Temperature: 22F, Dew point: 20F, Wind: W at 9 kt
Sea-level pressure: 29.96 inches Hg, falling
Visibility: 1/4 of a mile
6-hour maximum temperature: 29F
6-hour snowfall: 4.9 inches
6-hour precipitation: 0.35 inches
BHO SA 1755 W2 X1 1/4SF 145/22/20/2709/996/
TOTAL NEW SNW PST 6 HR 4.9 IN/ 8//// 56036 6035/ 10029 20022
 
WEATHER SUMMARY FOR SATURDAY, JANUARY 17
 
TEMPERATURE (DEGREES F)
MAX.....19    NORMAL.....33 
MIN......1    NORMAL.....18
MEAN....10    NORMAL.....26
 
DEPARTURE FROM 30-YEAR NORMAL..............-16
TOTAL DEPARTURE FOR THE MONTH..............-81  [-5.0 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............55  DEPARTURE........+16
TOTAL HEATING UNITS FOR THE MONTH............739  DEPARTURE........+82
TOTAL HEATING UNITS FOR THE SEASON..........2979  DEPARTURE.........-7
TOTAL HEATING UNITS LAST SEASON TO DATE.....2707  DIFFERENCE......+272
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............23   W  AT  1:30 A.M.
                   AEROVANE.............20   W  AT  1:25 A.M.  
                   ASOS.................22   W  AT  1:31 A.M.       
                   DAVIS................21   W  AT  1:30 A.M.        
FASTEST MILE FOR YESTERDAY..............18   W  AT  1:32 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...........22   W  AT  1:31 A.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..........16 SSW  AT  1:21 P.M.           
                   AVERAGE.............9.5 WSW
                   ASOS................9.5
                   DAVIS...............8.6  SW  [214 deg]  
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.13  DEPARTURE.........-0.03
                         ASOS...............0.09
TOTAL PRECIPITATION FOR THE MONTH...........2.17  DEPARTURE.........-0.47
                         ASOS...............3.11 #
TOTAL PRECIPITATION FOR THE YEAR............2.17  DEPARTURE.........-0.47
                         ASOS...............3.11 #
# 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..........2.3   DEPARTURE.........+1.8
TOTAL SNOWFALL FOR THE MONTH................9.9   DEPARTURE.........+1.4
TOTAL SNOWFALL FOR THE SEASON..............40.3   DEPARTURE........+18.2
 
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
1/15 16/5/11/-15/0/0/000/00          20 NW
1/16 17/0/9/-17/0/0/.../..           26 W
1/17 19/1/10/-16/.../../.../..       23 W
    
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 18
HIGH 62F IN 1973,1990
LOW -10F IN 1982
PRECIP 1.68 INS. IN 1915
SNOWFALL 13.0 INS. IN 1948
PEAK GUST 85 MPH SSE IN 2006
 
RECORDS FOR JANUARY 19
HIGH 59F IN 1973
LOW -11F IN 1887
PRECIP 2.34 INS. IN 1936
SNOWFALL 10.5 INS. IN 1936
PEAK GUST 93e MPH WNW IN 1943
 
TODAY'S REPORT PREPARED By: Andrew Hoell