BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MARCH 18, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME 
 
Today's observations:
 
7 A.M.
Weather: Thin scattered cirrus, smoke layer S-NW
Temperature: 35F, Dew point: 27F, Wind: S at 12 kts
Sea-level pressure: 30.19 inches Hg, falling
Visibility: 25 miles, light haze
6-hour minimum temperature: 31F
BHO SA 1155 250 –SCT 25 225/35/27/1912/019/
K LYR S-NW LGT HZ/ 8/001 58007 10035 20031
 
10 A.M.
Weather: Thin scattered cirrus
Temperature: 50F, Dew point: 32F, Wind: S at 16G23 kts
Sea-level pressure: 30.16 inches Hg, falling
Visibility: 20 miles, hazy
BHO SA 1455 250 –SCT 20 212/50/32/1916G23/016/ HAZY/ 8/001 58013
 
1 P.M.  
Weather: Scattered altocumulus, broken cirrostratus,
overcast cirrus, overcast partly thin
Temperature: 58F, Dew point: 32F, Wind: S at 17G30 kts
Wind: Peak gust 32 kts S at 12:21 P.M.
Sea-level pressure: 30.07 inches Hg, falling
Visibility: 15 miles, hazy
6-hour maximum temperature: 58F   
BHO SA 1755 180 SCT E220 BKN 250 OVC 15 182/58/32/1817G30/007/
OVC PTLY THN HAZY PK WND 1932/21/ 8/037 56030 10058 20035
 
WEATHER SUMMARY FOR TUESDAY, MARCH 17, 2009
 
TEMPERATURE (DEGREES F)
MAX.....47    NORMAL.....45
MIN.....28    NORMAL.....28
MEAN....38    NORMAL.....37
 
DEPARTURE FROM 30-YEAR NORMAL..................+1
TOTAL DEPARTURE FOR THE MONTH..................-1  [-0.3 DEGREES/DAY] 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............27  DEPARTURE.........-2
TOTAL HEATING UNITS FOR THE MONTH............526  DEPARTURE.........-2
TOTAL HEATING UNITS FOR THE SEASON..........5053  DEPARTURE........-45
TOTAL HEATING UNITS LAST SEASON TO DATE.....4733  DIFFERENCE......+320
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............21 SSW AT 10:27 P.M. *
                   AEROVANE.............23 SSW AT 10:27 P.M. *
                   ASOS.................22 SW  AT 10:28 P.M.     
                   DAVIS................21 S   AT  9:09 P.M.    
FASTEST MILE FOR YESTERDAY..............17 SSW AT 10:28 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE...........17 SSW AT 11:30 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE..........18 S   AT 10:28 P.M.   
                   AVERAGE.............8.3 NE 
                   ASOS................8.4
                   DAVIS...............7.7 E  [080 DEGREES]
 * last of several occurrences
 
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...........2.41 DEPARTURE.........-0.18
                         ASOS...............2.34
TOTAL PRECIPITATION FOR THE YEAR............8.94 DEPARTURE.........-2.49
                         ASOS...............9.96 #
# Includes erroneous ASOS precipitation data on 1/1/09, 1/2/09 and 2/27/09.
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0   DEPARTURE.........-0.4
TOTAL SNOWFALL FOR THE MONTH...............13.4   DEPARTURE.........+6.0
TOTAL SNOWFALL FOR THE SEASON..............78.7   DEPARTURE........+25.9
 
PRELIMINARY CLIMATE SUMMARY FOR MARCH 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
3/1  28/21/25/-7/0.26/1.9/000/00     38 NNE
3/2  22/15/19/-13/1.21/8.2/000/00    40 NNE    AERO 37 MPH NNE
3/3  25/11/18/-14/0.01/0.1/640/94    33 NW
3/4  30/6/18/-14/0/0/684/100         31 WNW
3/5  39/16/28/-5/0/0/659/96          25 WSW
3/6  49/30/40/+7/T/0/152/22          43 S      AERO 41 MPH S
3/7  60/42/51/+18/0.06/0/429/62      37 S
3/8  57/42/50/+16/0/0/445/64         39 WNW    AERO 40 MPH WNW
3/9  42/28/35/+1/0.72/3.2/000/00     33 N
3/10 42/26/34/0/0.02/0/470/67        23 SSE
3/11 50/33/42/+7/0.13/0/000/00       51 W
3/12 39/25/32/-3/0/0/685/97          44 W      AERO 45 MPH W
3/13 37/19/28/-7/0/0/660/93          26 SSE
3/14 50/25/38/+2/0/0/613/86          24 SSW
3/15 59/34/47/+11/0/0/686/96         17 SSW
3/16 42/29/36/0/0/0/000/00           30 NE
3/17 47/28/38/0/0/.../..             21 SSW    AER0 23 MPH SSW
 
3/18 morning low temp: 31F; our normal low is now 28F  
 
NEW DAILY RECORDS FOR MARCH 2009...
3/2: DAILY SNOWFALL 8.2 INS. SURPASSES PREVIOUS
     RECORD OF 7.1 INS. IN 1948
3/7: DAILY MINIMUM 42 TIES RECORD HIGH MINIMUM FOR DATE
     PREVIOUSLY SET IN 1974 AND 1987
3/8: DAILY MINIMUM 42 TIES RECORD HIGH MINIMUM FOR DATE
     PREVIOUSLY SET IN 1995
 
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 INS. IN 1968  [RECORD FOR MONTH]
SNOWFALL 9.3 INS. IN 1985
PEAK GUST 71e MPH WNW IN 1941
 
RECORDS FOR MARCH 19
HIGH 69 IN 1903
LOW -2 IN 1967
PRECIP 1.69 INS. IN 1956
SNOWFALL 17.6 INS. IN 1956 [RECORD FOR MONTH]
PEAK GUST 75e MPH WNW IN 1941
 
TODAY'S REPORT PREPARED BY: Stephanie Radner