BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MARCH 22, 2007  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
HIGHEST PRESSURE OBSERVED SINCE 1999...
The sea level pressure at 9:48 A.M. on March 21 was
30.81 inches Hg.  This is the highest pressure that 
has occurred since 30.84 inches Hg in January 1999.
This is also the highest pressure recorded in March
since 30.84 inches in March 1996. Yesterday's high 
pressure was just slightly higher than the high 
pressure recorded on January 17 of this year, which 
reached 30.78 inches Hg.
 
Today's observations:
 
7 A.M.   
Weather: Overcast 
Temperature: 38F, Dew point: 37F, Wind: S at 18G29 kt
Peak wind: 30 kts S at 6:01 A.M.
Sea-level pressure: 30.32 inches Hg, falling
Visibility: 10 miles
6-hour min. temp. 32F
Snow on ground: 2 inches
BHO SA 1155 E10 OVC 10 267/38/37/1918G29/032/ 
THN F PK WND 1930/01/ 8/6// 4/002 56017 10038 20032
 
10 A.M.   
Weather: Overcast
Temperature: 43F, Dew point: 41F, Wind: S at 24G33 kt
Peak wind: 34 kts S at 9:10 A.M. 
Sea-level pressure: 30.21 inches Hg, falling
Visibility: 5 miles, fog
BHO SA 1455 E8 OVC 5F 231/43/41/1924G33/021/ 
PK WND 1834/10/ 8/6// 58036 
 
1 P.M.   
Weather: Broken clouds, hazy
Temperature: 51F, Dew point: 45F, Wind: SSW at 27G37 kt  
Peak wind: 38 kts S at 12:04 P.M.
Sea-level pressure: 30.11 inches Hg, falling rapidly
Visibility: 10 miles
BHO SA 1755 E15 BKN 10 195/51/45/2027G37/011/ HAZY 
PK WND 1938/04 PRESFR/ 8/600 58036 10052 20038
 

WEATHER SUMMARY FOR WEDNESDAY, MARCH 21
 
TEMPERATURE (DEGREES F)
MAX.....36    NORMAL.....46 
MIN.....16    NORMAL.....29
MEAN....26    NORMAL.....38
 
DEPARTURE FROM 30-YEAR NORMAL..........-12
TOTAL DEPARTURE FOR THE MONTH..........-55 (-2.8 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........39   DEPARTURE.......+12
TOTAL HEATING UNITS FOR THE MONTH.........690   DEPARTURE.......+51 
TOTAL HEATING UNITS FOR THE SEASON.......4781   DEPARTURE......-428
TOTAL HEATING UNITS LAST SEASON TO DATE..4738   DIFFERENCE......+43
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............33 S   AT 10:38 P.M.         
                   AEROVANE.............33 S   AT 10:38 P.M.       
                   ASOS.................32 S   AT 10:51 P.M.       
                   DAVIS................35 S   AT 10:05 P.M.         
FASTEST MILE FOR YESTERDAY..............25 S   AT 11:10 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...........26 S   AT 11:10 A.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE..........Unknown    
AVERAGE WIND SPEED AND DIRECTION........11.1 NW 
                    ASOS................12.0     
                    DAVIS...............10.3 WSW  [250 deg] 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.....-0.16
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........5.42  DEPARTURE.....+2.04  
                         ASOS..............5.40    
TOTAL PRECIPITATION FOR THE YEAR..........11.14  DEPARTURE.....-1.08
                         ASOS.............11.03  
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.3
TOTAL SNOWFALL FOR THE MONTH................9.9  DEPARTURE......+1.0  
TOTAL SNOWFALL FOR THE SEASON..............23.8  DEPARTURE.....-30.5 
 
    
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 morning low temp. 31 degrees; normal low now 30
 
* 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 22
HIGH 71 IN 1948
LOW 3 IN 1885
PRECIP 3.48 INS. IN 2001
SNOWFALL 8.7 INS. 1967
WIND 84e MPH E IN 1977
 
RECORDS FOR MARCH 23
HIGH 78 IN 1938
LOW 3 IN 1934
PRECIP 1.58 INS. IN 1903
SNOWFALL 3.0 INS. IN 1977
WIND 78e MPH W IN 1940
 
TODAY'S REPORT By: Stephanie Radner