BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MARCH 18, 2007  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.   
Weather: Clear with a few clouds
Temperature: 21F, Dew point: 13F, Wind: WSW at 17G22 kt
Sea-level pressure: 29.72 inches Hg, rising
Visibility: 50 miles
6-hour min. temp. 20F
24-hour precipitation: 0.10 inches 
24-hour snowfall: 0.1 inches
Snow on ground: 4 inches
BHO SA 1155 CLR 50 066/21/13/2417G22/972/ FEW CI DSNT SW-NW PTCHS 
CU FRMG DSNT SW/ 8/401 4/004 53019 70010 10023 20020
 
10 A.M.   
Weather: Overcast with breaks and virga
Temperature: 26F, Dew point: 11F, Wind: WSW at 22 G31 kt  
Sea-level pressure: 29.75 inches Hg, rising
Visibility: 60 miles
BHO SA 1455 40 OVC 60 073/26/11/2522G31/975/ 
FEW BINOVC E VIRGA DSNT SW PK WND 2630/1435/ 8/4// 51007
 

WEATHER SUMMARY FOR SATURDAY, MARCH 17
 
TEMPERATURE (DEGREES F)
MAX.....34    NORMAL.....45 
MIN.....24    NORMAL.....28
MEAN....29    NORMAL.....37
 
DEPARTURE FROM 30-YEAR NORMAL...........-8
TOTAL DEPARTURE FOR THE MONTH..........-20 (-1.4 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........36   DEPARTURE........+7
TOTAL HEATING UNITS FOR THE MONTH.........545   DEPARTURE.......+17 
TOTAL HEATING UNITS FOR THE SEASON.......4636   DEPARTURE......-462
TOTAL HEATING UNITS LAST SEASON TO DATE..4592   DIFFERENCE......+44
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............51 NNE AT  3:00 A.M.         
                   AEROVANE.............50 NE  AT  1:20 A.M.       
                   ASOS.................46 WSW AT 12:33 A.M.       
                   DAVIS................47 NE          
FASTEST MILE FOR YESTERDAY..............35 NNE AT  3:35 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...........37 NNE  AT  3:35 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE..........34 NNE    
AVERAGE WIND SPEED AND DIRECTION........16.4 W 
                    ASOS................15.2     
                    DAVIS...............11.5 NNW [355 deg] 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.07  DEPARTURE.....-0.09
                         ASOS..............0.12
TOTAL PRECIPITATION FOR THE MONTH..........5.24  DEPARTURE.....+2.50  
                         ASOS..............5.22    
TOTAL PRECIPITATION FOR THE YEAR..........10.96  DEPARTURE.....-0.62 
                         ASOS.............10.85  
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.4
TOTAL SNOWFALL FOR THE MONTH................8.9  DEPARTURE......+1.5  
TOTAL SNOWFALL FOR THE SEASON..............22.8  DEPARTURE.....-30.0 
 
    
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/.../../000/00       51 NNE  Aero 50 MPH NE
 
* 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 18
HIGH 68 IN 1999
LOW   0 IN 1885
PRECIP 5.61 INCHES IN 1968  [RECORD FOR MONTH]
SNOWFALL 9.3 INCHES IN 1985
PEAK GUST 71e MPH WNW IN 1941
 
RECORDS FOR MARCH 19
HIGH 69 IN 1903
LOW -2 IN 1967
PRECIP 1.69 INCHES IN 1956
SNOWFALL 17.6 INCHES IN 1956 [RECORD FOR MONTH]
PEAK GUST 75e MPH WNW IN 1941

TODAY'S REPORT By: Andrew Hoell