BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MARCH 27, 2007  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
LAST NIGHT'S PRE-WARM FRONTAL RAINFALL 0.19 INCH
TODAY'S TEMPERATURES RUNNING WELL ABOVE NORMAL
 
Last night's rainfall was just enough to push the monthly 
total to 6 inches before ending in the very early morning
hours of today.  Today's temperatures have reached 60 degrees
and with a low of 41 degrees are running more than 10 degrees
above normal. A light seabreeze began early this afternoon 
knocking the thermometer back into the 50's.  
 
Today's observations:
 
7 A.M.   
Weather: Overcast altocumulus  
Temperature: 44F, Dew point: 43F, Wind: WSW at 08 kts
Sea-level pressure: 29.94 inches Hg, rising 
Visibility: 4 miles variable, variable 3 to 5 miles fog 
6-hour min. temp. 42F
6-hour precip. trace 
24-hour precip: 0.19 in.    
BHO SA 1155 E100 OVC 4VF 138/44/43/2508/994/ BRKS OVHD VSBY 3V5 
VSBY HIER W-NW THN F PTCHS GF BLO SMT/ 8/07/ 53005 MANUAL 70019
ASOS 70019 10044 20042 
 
10 A.M.   
Weather: Overcast stratocumulus with breaks WNW-NE-E  
Temperature: 51F, Dew point: 47F, Wind: WNW at 05 kts
Sea-level pressure: 29.95 inches Hg, steady
Visibility: 10 miles, thin fog and haze 
BHO SA 1455 E42 OVC 10 141/51/47/2905/995/ FEW CUFRA 
FRMG E-SE BINOVC/CLRG WNW-NE-E THN FH ALQDS/ 8/8// 53003 
 
1 P.M.   
Weather: Overcast stratocumulus with breaks    
Temperature: 57F, Dew point: 47F, Wind: NNE at 05 kts
Sea-level pressure: 29.95 Hg, steady  
Visibility: 15-20 miles, hazy  
Six hourly max. temp: 61 deg.  
BHO SA 1755 E24 BKN 32 OVC 15 143/57/47/0207/995/
FEW LWR CU BINOVC HAZY ALQDS VSBY W 20 GRDL WSHFT PST HR/ 8/8//
53002 10061 20044 
 
WEATHER SUMMARY FOR MONDAY, MARCH 26
 
TEMPERATURE (DEGREES F)
MAX.....45    NORMAL.....48 
MIN.....34    NORMAL.....31
MEAN....40    NORMAL.....39
 
DEPARTURE FROM 30-YEAR NORMAL..........+ 1
TOTAL DEPARTURE FOR THE MONTH..........-37 (-1.6 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........25   DEPARTURE........-1
TOTAL HEATING UNITS FOR THE MONTH.........804   DEPARTURE.......+33 
TOTAL HEATING UNITS FOR THE SEASON.......4895   DEPARTURE......-446
TOTAL HEATING UNITS LAST SEASON TO DATE..4869   DIFFERENCE......+26
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............37 S   AT  4:08 P.M.         
                   AEROVANE............ 36 S   AT  4:08 P.M.       
                   ASOS.................36 S   AT  4:17 P.M.        
                   DAVIS................40 S   AT  8:47 P.M.         
FASTEST MILE FOR YESTERDAY..............29 S   AT  4:32 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE...........31 S   AT  4:32 P.M.     
MAXIMUM 2-MINUTE DAVIS AVERAGE..........27 S   AT  1:20 P.M.     
AVERAGE WIND SPEED AND DIRECTION......16.2 S 
                    ASOS..............16.4     
                    DAVIS.............15.4 S [190 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.19  DEPARTURE.....+0.03
                         ASOS..............0.19
TOTAL PRECIPITATION FOR THE MONTH..........6.02  DEPARTURE.....+1.84  
                         ASOS..............6.01    
TOTAL PRECIPITATION FOR THE YEAR..........11.74  DEPARTURE.....-1.28
                         ASOS.............11.64  
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.3
TOTAL SNOWFALL FOR THE MONTH...............13.5  DEPARTURE......+3.1  
TOTAL SNOWFALL FOR THE SEASON..............27.4  DEPARTURE.....-28.4 
 
    
PRELIMINARY CLIMATE SUMMARY FOR MARCH 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
 
3/1  40/22/31/-1/0/0/512/76          24 NW   Aero 23 MPH NW
3/2  49/28/39/+7/1.74/0.4/000/00     48 E    Aero 45 MPH E
3/3  58/33/46/+14/0/0/489/72         44 WNW  Aero 43 MPH WNW
3/4  40/26/33/0/0/0/471/69           37 W
3/5  37/19/28/-5/T/T/198/29          58 W    Aero 57 MPH W 
3/6  19/3/11/-22/0/0/667/97 *        57 W    Aero 61 MPH W
3/7  22/2/12/-21/0/0/504/73          28 SW    
3/8  25/5/15/-19/T/T/471/68          51 WNW  Aero 54 MPH WNW
3/9  34/1/18/-16/0/0/668/96 *        25 S     
3/10 49/22/36/+2/0/0/322/46          39 S    Aero 39 MPH S 
3/11 51/33/42/+7/0.26/0/513/73       32 W 
3/12 55/31/43/+8/0/0/423/60          24 SSW 
3/13 60/36/48/+13/0/0/319/45         35 S    Aero 33 MPH S
3/14 66/42/54/+18/0/0/405/57         36 S
3/15 54/35/45/+9/0.07/0/000/00       36 NW
3/16 35/24/30/-6/1.65/8.5/000/00     55 NE   Aero 53 MPH NE
3/17 34/24/29/-6/1.52/T/000/00       51 NNE  Aero 50 MPH NE 
3/18 31/20/26/-11/0/0/258/37         43 W    Aero 42 MPH W
3/19 40/22/31/-6/0.18/1.0/442/61     38 S    Aero 37 MPH S
3/20 42/21/32/-6/0/0/677/93          46 WSW  Aero 47 MPH W
3/21 36/16/26/-12/0/0/702/96         33 S
3/22 52/31/42/+4/T/0/132/18          47 S    Aero 50 MPH S
3/23 57/41/49/+11/T/0/.../..         35 W
3/24 50/31/41/+2/0.40/3.5/.../..     28 E    Aero 23 MPH E
3/25 45/32/39/0/0.01/0.1/.../..      16 WSW
3/26 45/34/40/+1/0.17/0/007/01       37 S
 
3/27 morning low temp. 41 deg; normal now 31 deg. 
     morning rainfall since midnight 0.02 inch
 
* Record low maximum temperature of 19 on the 6th surpasses previous 21 set
  in 1916.
* Record low minimum temperature of 3 on the 6th ties previous 3 set in 1948.
* Record low minimum temperature of 1 on the 9th breaks previous 5 set in
  1885, 1943, and 1996.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MARCH 27
HIGH 78 IN 1998
LOW 12 IN 1975
PRECIP 1.05 INS. IN 1913
SNOWFALL 6.6 INS. IN 1959
PEAK GUST 62 MPH NW IN 1965, SE IN 1992
 
RECORDS FOR MARCH 28
HIGH 86 IN 1998
LOW 7 IN 1923
PRECIP 2.31 INS. IN 1932
SNOWFALL 3.0 INS. IN 1932
PEAK GUST 60e MPH NW IN 1944, 60 WSW IN 1991
 
TODAY'S REPORT By: Robert Skilling