BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JANUARY 19, 2008
ALL TIMES ARE IN EASTERN STANDARD TIME

Today's observations:

7 A.M.   
Weather: Broken altostratus, overcast cirrostratus
Temperature: 24F, Dew point: 12F, Wind: SW at 9 kts 
Sea-level pressure: 30.07 inches Hg, rising
Visibility: 45 miles 
6-hour min temp: 24F 
24-hour precip: 0.12 ins.
Snow depth on ground: 4 inches
BHO SA 1155 E160 BKN 220 OVC 45 183/24/12/2309/007/ 
BINOVC DSNT NW-NE AND SE-S/ 8/077 4/004 53014 70012 
10027 20024

10 A.M.
Weather: Scattered altocumulus, thin broken cirrus
Temperature: 27F, Dew point: 13F, Wind: SW at 8 kts
Sea-level pressure: 30.09 inches Hg, rising
Visibility: 55 miles
BHO SA 1455 E160 SCT 250 –BKN 55 190/27/13/2308/009/ 
WND LGT/ 8/071 53007

1 P.M.
Weather: Scattered altocumulus, overcast cirrus, breaks
in overcast distant SE-SW, thin spots all quadrants
Temperature: 31F, Dew point: 13F, Wind: SSW at 11 kts
Sea-level pressure: 29.96 inches Hg, falling
Visibility: 50 miles 
6-hourly max. temp. 31F
BHO SA 1755 E130 SCT 220 OVC 50 146/31/13/2011/996/ 
FEW HIR CI BINOVC DSNT SE-SW THN SPTS IOVC ALQDS/ 8/071 
56044 10031 20024

WEATHER SUMMARY FOR FRIDAY, JANUARY 18

TEMPERATURE (DEGREES F)
MAX.....44    NORMAL.....33 
MIN.....28    NORMAL.....18
MEAN....36    NORMAL.....26
DEPARTURE FROM 30-YEAR NORMAL..........+10 
TOTAL DEPARTURE FOR THE MONTH.........+128 [+6.9 DEGREES/DAY] 

HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............29  DEPARTURE......-10
TOTAL HEATING UNITS FOR THE MONTH...........569  DEPARTURE.....-127 
TOTAL HEATING UNITS FOR THE SEASON.........2736  DEPARTURE.....-289  
TOTAL HEATING UNITS LAST SEASON TO DATE....2375  DIFFERENCE....+361  
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............41 W   AT  9:43 A.M. *   
                   AEROVANE.............39 W   AT  9:42 A.M.  
                   ASOS.................39 W   AT  9:42 A.M. 
                   DAVIS................41 WSW AT  9:42 A.M. 
FASTEST MILE FOR YESTERDAY..............33 W   AT  9:42 A.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE...........31 W   AT  9:44 A.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..........34 W   AT  9:43 A.M.   
AVERAGE WIND SPEED AND DIRECTION.......16.8 W
                   ASOS................15.8 
                   DAVIS...............17.0 SW [229 deg] 
* Last of several occurrences.
  
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.12  DEPARTURE.....-0.04    
                         ASOS..............0.15 
TOTAL PRECIPITATION FOR THE MONTH..........3.67  DEPARTURE.....+0.87
                         ASOS..............3.78  
TOTAL PRECIPITATION FOR THE YEAR...........3.67  DEPARTURE.....+0.87
                         ASOS..............3.78 
  
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M........trace  DEPARTURE.....-0.5
TOTAL SNOWFALL FOR THE MONTH...............12.3  DEPARTURE.....+3.3
TOTAL SNOWFALL FOR THE SEASON..............42.8  DEPARTURE....+20.2

PRELIMINARY CLIMATE SUMMARY FOR JANUARY 2008 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available

1/1   38/28/33/+6/0.24/1.8/055/10   30 E   
1/2   29/7/18/-9/T/T/006/01         43 NW   Aero 43 MPH NW
1/3   11/2/7/-20/0/0/539/98         35 NW
1/4   30/2/16/-11/0/0/253/46        31 SSW
1/5   38/24/31/+4/0/0/292/53        28 SSW
1/6   47/34/41/+15/0/0/133/24       27 SSW 
1/7   54/39/47/+21/0/0/183/33       29 S 
1/8   65/45/55/+29/0/0/278/50       37 S 
1/9   59/42/51/+25/0.01/0/167/30    48 S
1/10  47/35/41/+15/0/0/335/60       35 W
1/11  55/35/45/+19/1.58/T/0/0       46 S    Aero 48 MPH S
1/12  47/32/40/+14/0/0/376/67       28 W
1/13  42/30/36/+10/0/0/455/81       33 ENE 
1/14  36/24/30/+4/1.45/10.3/000/00  37 NE   Aero 36 MPH NE
1/15  30/21/26/0/T/T/000/00         25 NW 
1/16  30/16/23/-3/0/0/.../..        28 NW
1/17  32/17/25/-1/T/T/.../.. *      23 ESE  Aero 19 MPH ESE
1/18  44/28/36/+10/0.39/0.2/.../..  41 W    Aero 39 MPH W

1/19  morning low temp. 24F; normal low now 18F
      total snow depth on ground at 7 a.m. 4 inches 

* Precipitation and snowfall corrected for 1/17.
       
NEW DAILY RECORDS FOR JANUARY 2008: 

1/8 - New record high temperature of 65 deg; 
the previous record, 59 deg. in 1930
New record high minimum temperature of 45 deg; 
the previous record, 41 deg. in 1930, 1935, 1967
 
1/9 - New record high minimum temperature of 42 deg;
the previous record, 39 deg. in 1937, 1956.

1/11 - New record rainfall of 1.58 inches; surpasses
previous record of 1.14 inches in 1956

1/14 - New record daily snowfall of 10.3 inches; surpasses 
previous record of 9.0 inches in 1999. 
New record maximum daily precipitation of 1.45 inches; 
surpasses 1.35 inches in 2006 

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

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

RECORDS FOR JANUARY 20
HIGH 59F IN 1951
LOW -9F IN 1901
PRECIP 1.95 INS. IN 1978
SNOWFALL 19.0 INS. IN 1978 [RECORD FOR MONTH]
PEAK GUST 76e MPH NE IN 1978

TODAY'S REPORT PREPARED By: Mike Iacono

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