BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, DECEMBER 14, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.
Weather: Broken cirrostratus, broken cirrus
Temperature: 34F, Dew point: 30F, Wind: WNW at 11 kts
Sea-level pressure: 29.99 inches Hg, rising
Visibility: 40 miles
6-hour minimum temp: 33F
24-hour precipitation: 0.74 in.
Average snow depth: Trace
BHO SA 1155 E220 BKN 250 BKN 40 155/34/30/3011/999/
FEW SC DSNT NE-SE/ 8/507 51036 MANUAL 70074 ASOS 70076 10035 20033
 
10 A.M.
Weather: Broken cirrus, patches dense cirrus
Temperature: 37F, Dew point: 31F, Wind: NNW at 7 kts
Wind: Direction gradually backing past hour
Wind: Direction variable W to N
Sea-level pressure: 30.08 inches Hg, rising  
Visibility: 30 miles, light haze
BHO SA 1455 E250 BKN 30 185/37/31/3307/008/
FEW SC DSNT N-E PTCHS DENS CI LGT HZ WND 26V01/ 8/502 50030
 
1 P.M.
Weather: Scattered stratocumulus, scattered cirrostratus,
broken cirrus, partial halo
Temperature: 41F, Dew point: 33F, Wind: ESE at 6 kts
Wind: Light and variable, veering past hour
Sea-level pressure: 30.07 inches Hg, falling  
Visibility: 40 miles, light haze
BHO SA 1755 55 SCT 220 SCT E250 BKN 40 183/41/33/1106/007/
PARTIAL HALO LGT HZ WND LGT AND VRB WND VEERING PST HR/
8/501 58002 10041 20034
 
WEATHER SUMMARY FOR SUNDAY, DECEMBER 13
 
TEMPERATURE (DEGREES F)
MAX.....46     NORMAL.....39
MIN.....23     NORMAL.....24
MEAN....35     NORMAL.....32
 
DEPARTURE FROM 30-YEAR AVERAGE.............+3
TOTAL DEPARTURE FOR THE MONTH.............+20  [+1.3 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............30    DEPARTURE........-3
TOTAL HEATING UNITS FOR THE MONTH...........385    DEPARTURE.......-18
TOTAL HEATING UNITS FOR THE SEASON.........1545    DEPARTURE......-147
TOTAL HEATING UNITS LAST SEASON TO DATE....1634    DIFFERENCE......-89
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............35 SSE AT  2:16 P.M.
                   AEROVANE..............31 SSE AT  8:41 P.M. 
                   ASOS..................32 S   AT  8:24 P.M. 
                   DAVIS.................33 ESE AT  8:35 P.M.
THE FASTEST MILE FOR YESTERDAY...........26 SE  AT  8:35 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............23 SSE AT  8:24 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........25 SE  AT  8:36 P.M. 
AVERAGE WIND SPEED AND DIRECTION.......14.2 S
                   ASOS................13.3
                   DAVIS...............13.3 S [180 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.74   DEPARTURE....+0.60
                         ASOS..............0.76
TOTAL PRECIPITATION FOR THE MONTH..........3.94   DEPARTURE....+2.01
                         ASOS..............4.01
TOTAL PRECIPITATION FOR THE YEAR..........53.51   DEPARTURE....+4.92
                         ASOS.............54.77
                 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.....-0.3
TOTAL SNOWFALL FOR THE MONTH...............11.0  DEPARTURE.....+7.5
TOTAL SNOWFALL FOR THE SEASON..............14.0  DEPARTURE.....+7.6
                                               
PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
12/1  41/28/35/-1/0/0/497/89       29 NW 
12/2  51/33/42/+6/0.08/0/345/62    30 SSE
12/3  67/47/57/+22/1.01/0/428/77   69 SSE  AERO 73 MPH SSE
12/4  52/40/46/+11/0/0/488/88      26 W
12/5  42/30/36/+1/0.79/4.7/000/00  36 N
12/6  33/25/29/-5/0.09/0.6/.../..  36 NW
12/7  36/25/31/-3/0/0/.../..       22 WSW
12/8  39/25/32/-3/0/0/.../..       27 WNW
12/9  45/29/37/+4/1.23/5.7/000/00  52 ENE  AERO 46 MPH ENE
12/10 40/26/33/0/0/0/.../..        46 WSW  AERO 39 MPH W
12/11 26/20/23/-9/0/0/.../..       46 WSW  AERO 41 MPH WSW
12/12 30/18/24/-8/0/0/.../..       36 W    AERO 33 MPH W 
12/13 46/23/35/+3/0.74/0/.../..    35 SSE  AERO 31 MPH SSE
 
12/14 our morning low temp: 33F; the normal low is now 24F
 
NEW DAILY RECORD FOR DECEMBER 2009
12/3 NEW RECORD HIGH MAXIMUM TEMPERATURE of 67F;
     surpasses previous record of 61F in 1932, 1950.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR DECEMBER 14
HIGH 62 IN 1901
LOW -6 IN 1893
PRECIP 1.94 INS. IN 2002
SNOWFALL 8.0 INS. IN 1907
PEAK GUST 78e ENE IN 1941
 
RECORDS FOR DECEMBER 15
HIGH 64 IN 1975
LOW 4 IN 1900, 1905, 1933
PRE 1.80 INS. IN 1981
SNOW 7.5 INS. IN 1951
PEAK GUST 65 MPH NW IN 1991
 
TODAY'S REPORT PREPARED BY: Stephanie Radner