BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 13, 2009 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.  
Weather: Sky obscured, fog
Temperature: 61F, Dew point: 61F, Wind: NNW AT 6 kt
Sea-level pressure: 29.88 inches Hg, falling
Visibility: 1/16 mile, dense fog
6-hour minimum temp: 60F
24-hour precipitation: 1.14 inches
BHO SA 1155 W2 X1 1/16F 118/61/61/3306/988/
WND LGT/ 8//// 58007 6//// 70114 10061 20060
 
10 A.M.
Weather: Broken cumulus mediocris,
broken altocumulus translucidis
Temperature: 66F, Dew point: 64F, Wind: W at 7 kt
Sea-level pressure: 29.78 inches Hg, falling
Visibility: 15 miles, hazy
BHO SA 1455 10 BKN 120 BKN 15 114/66/64/2707/978/
HAZY WND LGT/ 8/250 58004
 
1 P.M.
Weather: Broken cumulus congestus,
broken altocumulus stratiformis,
broken cirrus fibratus
Temperature: 75F, Dew point: 63F, Wind: SW at 7 kt
Wind: Light and variable
Sea-level pressure: 29.83 inches Hg, falling
Visibility: 60 miles
6-hour max. temp: 75F
BHO SA 1755 30 BKN 140 BKN 220 BKN 60 102/75/63/2407/983/
WND L/V/ 8/251 56012 10075 20061
 
 
WEATHER SUMMARY FOR SATURDAY, SEPTEMBER 12
 
TEMPERATURE (DEGREES F)
MAX.....63    NORMAL.....72
MIN.....60    NORMAL.....54
MEAN....62    NORMAL.....63
 
DEPARTURE FROM 30-YEAR AVERAGE...........-1
TOTAL DEPARTURE FOR THE MONTH...........-21 [-2.0 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............3  DEPARTURE.......-1
TOTAL HEATING UNITS FOR THE MONTH............33  DEPARTURE.......+1
TOTAL HEATING UNITS FOR THE SEASON...........67  DEPARTURE.......+4
TOTAL HEATING UNITS LAST SEASON TO DATE......30  DIFFERENCE.....+37
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............30 NNE  AT  6:55 A.M.  
                   AEROVANE..............28 NNE  AT  6:55 A.M.  
                   ASOS..................28 NE   AT  6:56 A.M.  
                   DAVIS................ 26 NE   AT  3:46 A.M.  
FASTEST MILE FOR YESTERDAY...............21 NNE  AT  4:31 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............20 NE   AT 10:45 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........19 NNE  AT  4:33 A.M.  
AVERAGE WIND SPEED AND DIRECTION.......13.5 NE
                   ASOS................13.2
                   DAVIS...............13.2 NNE [27 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....1.14   DEPARTURE....+1.00
                         ASOS..............1.16
TOTAL PRECIPITATION FOR MONTH..............2.29   DEPARTURE....+0.68
                         ASOS..............2.33
TOTAL PRECIPITATION FOR THE YEAR..........37.06   DEPARTURE....+1.98
                         ASOS.............38.25
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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
 
9/1  71/51/61/-6/0/773/98     17 NW
9/2  76/54/65/-1/0/786/100    22 S
9/3  77/56/67/+1/0/587/75     19 SW
9/4  77/60/69/+3/0/764/98     18 NE
9/5  81/59/70/+5/0/591/76     25 NNW
9/6  64/53/59/-6/0/743/96     31 NNE
9/7  70/52/61/-4/0/709/92     20 WSW
9/8  75/56/66/+1/0/369/48     18 WSW  
9/9  68/55/62/-2/0/352/46     36 NNE
9/10 65/53/59/-5/0/603/79     31 ENE
9/11 61/54/58/-6/.../0/0      30 NE
9/12 63/60/61/-1/.../0/0      30 NNE
 
NEW DAILY RECORDS FOR SEPTEMBER 2009 TO DATE...
None.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 13
HIGH 91F IN 1957
LOW 40F IN 1985
PRECIP 3.10 INCHES IN 1987
PEAK GUST 44 MPH WNW IN 1986
 
RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 4.38 INCHES IN 1944 (Great Atlantic Hurricane in 1944)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944)
 
TODAY'S REPORT PREPARED BY: Andrew Hoell