BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, FEBRUARY 21, 2007  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
ANOTHER MILD DAY TODAY WITH TEMPS. INTO 40'S
PERIOD OF LIGHT RAIN OVERNIGHT LEAVES 0.01 INCH
 
Clouds cleared away early this morning leaving us 
with mostly sunshine today, and for the second day
in a row the temperatures are running on the mild 
side of normal starting out at 33 degrees for a low
and reaching the low to mid-40's this afternoon. 
Several hours of light rain overnight left barely 
a 0.01 of an inch.
 
Today's observations:
 
7 A.M.   
Weather: Clear, few clouds   
Temperature: 33F, Dew point: 28F, Wind: NNW at 10 kts 
Sea-level pressure: 29.73 inches Hg, rising 
Visibility: 15 miles, thin fog  
6-hourly min. temp. 33 deg. 
6-hourly rainfall: 0.01 inch
24-hourly rainfall: 0.01 inch
Snow on ground: 1 inch
BHO SA 1155 CLR 15 067/33/28/3310/973/ FEW SC SE AC/FEW ACSL ALQDS
AC LYR XTDNG E-SSW SKY CLRG PST HR THN F WND GRDLY VEERING 
FEW PTCHS BLACK ICE/ 8/540 4/001 53027 ASOS 60001 MANUAL 6001/ 
ASOS 70001 MANUAL 70001 10039 20033 
 
10 A.M.    
Weather: Clear with cumulus forming   
Temperature: 38F, Dew point: 25F, Wind: NW AT 8 kts  
Sea-level pressure: 29.80 inches Hg, rising 
Visibility: 30 miles, light haze  
BHO SA 1455 CLR 30 091/38/25/3208/980/ CU FRMG SW-N FEW AC DSNT NW-N 
FEW CI N-E LGT HZ/ 8/141 51024 
 
  
1 P.M.    
Weather: Thin broken middle and high clouds   
Temperature: 43F, Dew point: 21F, Wind: W AT 9 kts
Sea-level pressure: 29.80 inches Hg, falling 
Visibility: 45 miles   
6-hourly max. temp. 43 deg.  
BHO SA 1755 150 –BKN 250 –BKN 45 092/43/21/2809/980/ FEW CU/ 
8/141 50001 10043 20033
 
  
WEATHER SUMMARY FOR TUESDAY, FEBRUARY 20
 
TEMPERATURE (DEGREES F)
MAX.....48    NORMAL.....37 
MIN.....17    NORMAL.....21   
MEAN....33    NORMAL.....29
 
DEPARTURE FROM 30-YEAR NORMAL..........+4
TOTAL DEPARTURE FOR THE MONTH........-122 (-5.9 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........32   DEPARTURE........-4
TOTAL HEATING UNITS FOR THE MONTH.........873   DEPARTURE......+128 
TOTAL HEATING UNITS FOR THE SEASON.......3817   DEPARTURE......-474
TOTAL HEATING UNITS LAST SEASON TO DATE..3768   DIFFERENCE......+49
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............35 SSW AT  6:53 A.M.      
                   AEROVANE.............34 SSW AT  6:53 A.M.      
                   ASOS.................32 SSW AT  6:53 A.M.     
                   DAVIS................39   S AT  7:04 A.M.       
FASTEST MILE FOR YESTERDAY..............26 SSW AT  6:53 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...........25 SSW AT  6:53 A.M.      
MAXIMUM 2-MINUTE DAVIS AVERAGE..........28   S AT  6:53 A.M.     
AVERAGE WIND SPEED AND DIRECTION......15.2 SW  
                    ASOS..............15.6      
                    DAVIS.............15.7 SSW [200 deg] 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01  DEPARTURE.....-0.13
                         ASOS..............0.01
TOTAL PRECIPITATION FOR THE MONTH..........2.35  DEPARTURE.....-0.52  
                         ASOS..............2.36    
TOTAL PRECIPITATION FOR THE YEAR...........5.29  DEPARTURE.....-2.36  
                         ASOS..............5.23
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.5
TOTAL SNOWFALL FOR THE MONTH................2.3  DEPARTURE......-9.7  
TOTAL SNOWFALL FOR THE SEASON...............8.7  DEPARTURE.....-32.5 
 
PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 2007......CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
 
2/1  35/20/28/+2/0/0/126/21         37 S    Aero 34 MPH S
2/2  35/28/32/+6/0.18/0.3/000/00    20 NW
2/3  32/19/26/0/0.05/0.4/574/95     39 W    Aero 47 MPH W  
2/4  22/10/16/-10/0/0/601/99        39 WSW  Aero 40 MPH WSW
2/5  16/5/11/-16/0/0/493/81         61 W    Aero 60 MPH W  
2/6  24/10/17/-10/0/0/593/97        38 W    Aero 36 MPH W 
2/7  21/8/15/-12/0/0/474/77         43 W    Aero 41 MPH W
2/8  25/11/18/-9/0/0/370/60         48 WSW
2/9  26/15/21/-6/0/0/600/97         44 WSW  Aero 42 MPH WSW
2/10 32/13/23/-4/0/0/199/32         28 W     
2/11 31/14/23/-4/0/0/456/73         27 SSW  
2/12 36/20/28/0/0/0/602/96          43 WSW  Aero 40 MPH W  
2/13 22/6/14/-14/0.02/0.2/226/36    28 NW   
2/14 36/13/25/-3/2.09/1.4/000/00    47 NE   Aero 52 MPH NE
2/15 21/9/15/-13/0/0/616/97         46 W    Aero 53 MPH W
2/16 27/9/18/-10/0/0/624/98         51 W    Aero 49 MPH W
2/17 34/17/26/-3/0/0/596/93         42 W
2/18 33/16/25/-4/0/0/289/45         38 WNW  Aero 40 MPH WNW  
2/19 20/5/13/-16/0/0/646/100        46 WNW  Aero 51 MPH WNW                               
2/20 48/17/33/+4/T/0/266/41         35 SSW  Aero 34 MPH SSW 
 
2/21 morning low temp. 33 deg; normal now 21 deg. 
     early morning rainfall: 0.01 inch
 
2/14 - NEW RECORD DAILY PRECIPITATION OF 2.09 INCHES;  
the previous record was 1.95 inches in 1940.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR FEBRUARY 21
HIGH 62F IN 1930
LOW -6F IN 1950
PRECIP 2.42 INCHES IN 1898
SNOWFALL 9.0 INCHES IN 1929
PEAK GUST 72 MPH WNW IN 1967
 
RECORDS FOR FEBRUARY 22
HIGH 63F IN 1997
LOW -1F IN 1918
PRECIP 1.38 INCHES IN 1900
SNOWFALL 8.0 INCHES IN 1893
PEAK GUST 74 MPH S IN 1974
 
TODAY'S REPORT By: Robert Skilling