BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 6, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
SUNSHINE TODAY WITH BUILDING CUMULUS
TEMPS. REACH 79F AND STILL NO 80F 
IN JUNE OR IN JULY SO FAR
 
Cumulus clouds began forming and quickly
became of the congestus variety but without
any observations of virga so far today.
A continuation of a continental polar
airmass over us keeps temperatures from
reaching highs by a few degrees as
humidity remains low with dew points
down in the 40's and 50's over the past
several days. We have not recorded an
80-degree or higher maximum temperature
since 80F on 24 May after two days with
just 79F during our very cool June. 
 
Today's observations:
 
7 A.M.  
Weather: Clear with a few altocumulus lenticularis
to the distant west and northwest and few cirrus
distant south and distant north-northwest-north
Temperature: 68F, Dew point: 53F, Wind: ESE at 5 kts
Sea-level pressure: 29.80 inches Hg, falling slightly
Visibility: 50 miles, 35 miles north thru east
6-hour minimum temp: 60F
24-hour rainfall: 0
BHO SA 1155 CLR 50 090/68/53/1205/980/
FEW ACSL DSNT W AND NW FEW CI DSNT S AND
 DSNT NNW-N THN K ALG HRZN NNW-NNE VSBY N-E 35/
8/041 58001 10068 20060
 
10 A.M.  
Weather: Scattered cumulus, moderate cumulus,
altocumulus 
Temperature: 75F, Dew point: 54F, Wind: W at 3 kts
Sea-level pressure: 29.80 inches Hg, falling
Visibility: 55 miles, 40 miles northeast thru southeast
BHO SA 1455 40 SCT 110 SCT 55 090/75/54/2603/980/
CU/MDT CU FRMG ALQDS PTCHS AC/ACSL DSNT NW-NE
VSBY NE-SE 40 LGT HZ WND LGT/ 8/240 50000
 
1 P.M.  
Weather: Broken cumulus, moderate cumulus  
Temperature: 77F, Dew point: 50F, Wind: WNW at 4 kts,
Wind: light and variable
Sea-level pressure: 29.77 inches Hg, falling
Visibility: 60 miles, 70 miles northwest
6-hourly max. temp. 79F
BHO SA 1755 E55 BKN 60 080/77/50/2904/977/ MDT CU ALQDS
VSBY NW 70 WND LGT AND VRB/ 8/200 56010 10079 20068 
 
WEATHER SUMMARY FOR SUNDAY, JULY 5
 
TEMPERATURE (DEGREES F)
MAX.....78    NORMAL.....80
MIN.....54    NORMAL.....61
MEAN....66    NORMAL.....71
 
DEPARTURE FROM 30-YEAR NORMAL...........-5
TOTAL DEPARTURE FOR THE MONTH..........-29  [-6.0 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............0  DEPARTURE.......-1
TOTAL HEATING UNITS FOR THE MONTH.............9  DEPARTURE.......+4
TOTAL HEATING UNITS FOR THE SEASON............9  DEPARTURE.......+4
TOTAL HEATING UNITS LAST SEASON TO DATE.......0  DIFFERENCE......+9
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............33 W   AT 10:59 A.M. *  
                   AEROVANE..............31 W   AT 11:26 A.M. *    
                   ASOS..................32 W   AT 10:23 A.M.    
                   DAVIS.................34 W   AT 10:17 A.M.  
FASTEST MILE FOR YESTERDAY...............24 W   AT 10:54 A.M. * 
MAXIMUM 2-MINUTE ASOS AVERAGE............23 W   AT 11:14 A.M.       
MAXIMUM 2-MINUTE DAVIS AVERAGE...........24 W   AT 10:55 A.M.     
AVERAGE WIND SPEED AND DIRECTION.......13.6 W 
                   ASOS................13.0
                   DAVIS...............13.0 W [ 260 DEG]
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE....-0.12
                         ASOS..............0.00
TOTAL PRECIPITATION FOR  JULY..............1.54  DEPARTURE....+0.92
                         ASOS..............1.56 
TOTAL PRECIPITATION FOR THE YEAR..........25.18  DEPARTURE....-1.11
                         ASOS.............26.21
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
7/1  62/57/60/-10/.../000/00    25 NNE   TSTM
7/2  66/56/61/-9/.../000/00     29 SSW   AERO 25 MPH SSW TSTM
7/3  75/58/67/-3/T/.../..       23 WSW
7/4  77/59/68/-2/0/.../..       43 W      
7/5  78/54/66/-5/0/.../..       33 W     
 
7/6  our morning low temp: 60F,  the normal low is now 61F/
 
NEW DAILY RECORDS FOR JULY 2009 TO DATE...
NONE
 
DAILY EXTREMES
 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 6
HIGH 98F IN 1911
LOW 47F IN 1979
PRECIP 1.43 INCHES IN 2005
PEAK GUST 56e MPH NNW IN 1942, 56 MPH WNW IN 1999
 
RECORDS FOR JULY 7
HIGH 97F IN 1908,1993
LOW 48F IN 1902
PRECIP 2.11 INCHES IN 1966
PEAK GUST 55 MPH NW IN 1989
 
TODAY'S REPORT PREPARED BY: Robert Skilling