BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MARCH 9, 2007  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
NEW RECORD LOW TEMPERATURE FOR THIS DATE, 1 DEGREE;
COLDEST MARCH TEMPERATURE SINCE 1980
 
The low temperature this morning of 1 degree, which 
occurred just after 6 A.M., is a new record low for 
March 9.  The previous record for this date was 
5 degrees in 1885, 1943 and 1996. 
 
Today's low is also the coldest temperature for any 
date in March since 1 degree on March 1, 1980, and
it is the second lowest temperature of the season so
far.  The lowest temperature of -1 degree occurred on
January 26.
 
Today's observations:
 
7 A.M.   
Weather: Thin broken cirrus
Temperature: 3F, Dew point: -15F, Wind: NW at 9 kts 
Sea-level pressure: 30.50 inches Hg, rising
Visibility: 70 miles 
6-hour min. temp. 1 deg. 
BHO SA 1155 250 –BKN 70 330/3/-15/3109/050/ 8/001 51012 
10003 20001
 
10 A.M.   
Weather: Clear, few clouds
Temperature: 18F, Dew point: -9F, Wind: WNW at 4 kts 
Sea-level pressure: 30.54 inches Hg, rising
Visibility: 60 miles  
BHO SA 1455 CLR 60 343/18/-9/3004/054/ FEW SC DSNT E 
FEW CI SE-W THN K LYR ALNG HRZN XCPT E-SE/ 8/501 51013
 
1 P.M.   
Weather: Thin scattered cirrus
Temperature: 31F, Dew point: -4F, Wind: SSW at 7 kts 
Sea-level pressure: 30.51 inches Hg, falling
Visibility: 65 miles 
6-hour max. temp. 31 deg.
BHO SA 1755 250 –SCT 65 331/31/-4/2107/051/ 
FEW SC DSNT NE-E WND 17V28/ 8/501 58012 10031 20003
 
WEATHER SUMMARY FOR THURSDAY, MARCH 8
 
TEMPERATURE (DEGREES F)
MAX.....25    NORMAL.....42 
MIN......5    NORMAL.....25
MEAN....15    NORMAL.....34                     
 
DEPARTURE FROM 30-YEAR NORMAL.........-19
TOTAL DEPARTURE FOR THE MONTH.........-47 (-5.7 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........50   DEPARTURE.......+19
TOTAL HEATING UNITS FOR THE MONTH.........305   DEPARTURE.......+45 
TOTAL HEATING UNITS FOR THE SEASON.......4396   DEPARTURE......-434
TOTAL HEATING UNITS LAST SEASON TO DATE..4386   DIFFERENCE......+10
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............51 WNW  AT  2:17 P.M.       
                   AEROVANE.............54 WNW  AT  2:17 P.M.       
                   ASOS.................52 WNW  AT  2:18 P.M.        
                   DAVIS................52 WNW  AT  2:17 P.M.        
FASTEST MILE FOR YESTERDAY..............40 WNW  AT  2:17 P.M. *       
MAXIMUM 2-MINUTE ASOS AVERAGE...........39 WNW  AT  2:18 P.M.  
MAXIMUM 1-MINUTE DAVIS AVERAGE..........41 W    AT  2:18 P.M.  
AVERAGE WIND SPEED AND DIRECTION......17.5 WNW  
                    ASOS..............17.4      
                    DAVIS.............17.8 W    [278 deg] 
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...trace  DEPARTURE.....-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.74  DEPARTURE.....+0.39  
                         ASOS..............1.75    
TOTAL PRECIPITATION FOR THE YEAR...........7.46  DEPARTURE.....-2.73 
                         ASOS..............7.38
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M........trace  DEPARTURE......-0.4
TOTAL SNOWFALL FOR THE MONTH................0.4  DEPARTURE......-3.4  
TOTAL SNOWFALL FOR THE SEASON..............14.3  DEPARTURE.....-34.9 
 
    
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   Aero 26 MPH SW
3/8  25/5/15/-19/T/T/471/68          51 WNW  Aero 54 MPH WNW
 
3/9  morning low temp. of 1 deg; normal low now 26 deg.
 
* 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.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MARCH 9
HIGH 71 IN 2000
LOW 5 IN 1885, 1943, 1996
PRECIP 2.67 INS. IN 1998
SNOWFALL 6.3 INS. IN 2001
PEAK GUST 102e MPH S IN 1942 [RECORD FOR MONTH]
 
RECORDS FOR MARCH 10
HIGH 69 IN 1977
LOW 2 IN 1984
PRECIP 2.00 INS. IN 1994
SNOWFALL 4.0 INS. IN 1997
PEAK GUST 80 MPH NW IN 1974
 
TODAY'S REPORT By: Stephanie Radner