BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, SEPTEMBER 12, 2011
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WARMER AND MUCH MORE HUMID WEATHR RETURNS
WITH PLENTY OF BRIGHT SUNSHINE AND VISIBILITY 
DOWN TO 25 MILES FROM 80 MILES YESTERDAY
 
Temperatures have risen close to 80F by early
this afternoon with much more humidity which
arrived overnight last night.  The dew point is
in the lower 60's.  Sunshine prevails today but
with the increased humidity our visibility has 
dropped down to 25 miles in hazy conditions from
the 80 miles just 24 hours ago. 
 
Today's observations:
 
7 A.M.  
Weather: Scattered variable to broken stratus
Temperature: 63F, Dew point: 61F; Wind: SW at 8 kts
Sea-level pressure: 30.01 inches Hg, rising
Visibility: 10 miles thin fog all quadrants 
6-hour min. temp: 57F
BHO SA 1155 4 SCT 10 164/63/61/2208/001/ SCT V BKN THN FG ALQDS/
8/600 53004 10063 20057 
 
10 A.M.
Weather: Scattered stratocumulus  
Temperature: 73F, Dew Point: 63F; Wind: WSW at 5 kts
Sea-level pressure: 30.02 inches Hg, rising
Visibility: 20 miles, hazy 
BHO SA 1455 23 SCT 20 166/73/63/2405/002/
HAZY/ 8/500 53002 
 
1 P.M.
Weather: Clear, cumulus all quadrants, few moderate cumulus
Temperature: 79F, Dew Point: 62F; Wind: SSW at 7 kts,
Wind: Direction variable S-WSW
Sea-level pressure: 29.97 inches Hg, falling
Visibility: 25 miles, hazy
6-hour max: 79F 
BHO SA 1755 CLR 25 150/79/62/2107/997/ CU ALQDS FEW MDT HAZY
WND 18V25/ 8/200 58016 10079 20063
 
WEATHER SUMMARY FOR SUNDAY, SEPTEMBER 11
 
TEMPERATURE (DEGREES F)
MAX.....74    NORMAL.....73
MIN.....54    NORMAL.....55
MEAN....64    NORMAL.....64
 
DEPARTURE FROM 30-YEAR NORMAL..................... 0
TOTAL DEPARTURE FOR THE MONTH.....................+5 [+0.3 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............18 S   AT 11:12 P.M. *
                   AEROVANE...............25 N   AT  8:36 A.M. *
                   ASOS...................21 S   AT  8:36 P.M.
                   DAVIS..................20 SSE AT  6:40 P.M. RMY 21
THE FASTEST MILE FOR YESTERDAY............15 S   AT 11:12 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE.............15 S   AT 11:22 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE............14 S   AT  9:42 P.M.
AVERAGE WIND SPEED AND DIRECTION.........8.1 S
                   ASOS..................7.8
                   DAVIS.................7.4 SE [1401 deg]
*...last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.........-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........3.23  DEPARTURE.........+1.76
                         ASOS..............3.18
TOTAL PRECIPITATION FOR THE YEAR..........41.27  DEPARTURE.........+6.33
                        ASOS..............41.74**
**ASOS data is in error due to system failure on 1/12-13
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2011 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
RMY:  R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
9/1  76/58/67/0/0.00/441/56     17 NE  AERO 22 MPH RMY 17 MPH
9/2  71/57/64/-2/0.00/708/90    15 NE  AERO 20 MPH RMY N/A
9/3  83/57/70/+4/0.00/619/79    21 SSW AERO 27 MPH RMY 22 MPH
9/4  81/65/73/+7/0.00/266/34    34 S   AERO 35 MPH RMY 31 MPH
9/5  83/65/74/+9/0.00/467/60    37 S   AERO 44 MPH RMY 40 MPH
9/6  70/56/63/-2/1.10/000/00    36 NNW AERO 45 MPH NNW RMY 40 MPH
9/7  60/56/58/-7/0.62/000/00    29 NE  AERO 32 MPH NE  RMY 28 MPH
9/8  60/56/58/-7/1.51/000/00    29 ENE AERO 31 MPH ENE RMY 27 MPH
9/9  76/58/67/+3/0.00/506/66    18 NNW AERO 26 MPH NNW RMY 21 MPH
9/10 72/56/64/0/0.00/718/94     18 NNE AERO 25 MPH N   RMY 22 MPH
9/11 74/54/64/0/0.00/632/83     18 S   AERO 25 MPH S   RMY 21 MPH
 
9/12 our morning low temp: 57F; the normal low temp: 54F  
 
DAILY RECORDS FOR SEPTEMBER 2011
9/8 - RECORD DAILY PRECIPITATION OF 1.51 inches;
surpasses the previous record of 0.79 inch set in 2004 
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 12
HIGH 92F IN 1961
LOW 42F IN 1958,1967,1985
PRECIP 2.79 INCHES IN 1960 (HURRICANE DONNA)
PEAK GUST 140 MPH SSE IN 1960 (HURRICANE DONNA)
 
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
 
TODAY'S REPORT PREPARED BY: Robert Skilling/Patrick Peters