BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 28, 2011
ALL TIMES ARE IN EASTERN STANDARD TIME
 
VERY WARM AND HUMID FOR ONE WEEK AS TEMPERATURES 
AVERAGE OVER 10.7 DEGREES ABOVE NORMAL 
THIS MONTH WILL LIKELY RANK HIGH ON THE LIST OF 
OUR WARMEST SEPTEMBERS
 
A cold front was expected to clear out the very
persistent warm and muggy air mass which has been
stuck over us for a week. Yesterday became the 5th
consecutive day to have temperatures which averaged
10 degrees or more above normal
 
To put this occurrence in perspective, the last such
streak occurred more than a year ago, back on August 30 thru
September 3, 2010.
 
Today's observations:
 
7 A.M.  
Weather:  Scattered altocumulus, few altocumulus castellanus,
and floccus, distant stratocumulus SW-NW-N-ENE,
Temperature: 62F, Dew point: 57F; Wind: E at 9 kts,
Sea-level pressure: 30.10 inches Hg, rising  
Visibility: 20 miles except 30 miles NE, thin fog/hazy
in all quadrants
6-hour min: 60F
BHO SA 1155 100 SCT 20 194/62/57/1009/010/
SC SW-NW-N-ENE AC/ACC/AC FLOCCUS VSBY NE 30
THN F HAZY ALQDS/ 8/580/ 51013 10062 20060
 
10 A.M.
Weather: Clear, stratus layer along horizon distant NNE-NE,
few cumulus fractus forming vicinity of station,
few cumulus distant north and south-southeast
Temperature: 71F, Dew Point: 56F; Wind: E at 7 kts,
Wind: Direction variable E to SE
Sea-level pressure: 30.11 inches Hg, falling
Visibility: 35 miles
BHO SA 1455 CLR 35 195/71/56/1007/011/ STRA LYR ALG HRZN DSNT NNE-NE
FEW CUFRA FRMG VCTY STN FEW CU DSNT N AND SSE FEW AC/ACSL DSNT WSW
FEW CI DSNT SE DSNT HZ WND 08V14/ 8/141 50001 
 
1 P.M. 
Weather: Scattered cumulus, few moderate, scattered altocumulus
distant SW-WSW, stratus clouds distant NNE-NE
Temperature: 72F, Dew Point: 59F; Wind: E at 11 kts, 
Wind: Direction variable ENE-SE
Wind: Gust 15 kts past hour
Sea-level pressure: 30.06 inches Hg, falling
Visibility: 30 miles, distant haze, except 12 miles NNE-NE,
with low stratus clouds and thin fog, visibility WNW 45, distant haze
6-hour max. temp: 74F 
BHO SA 1755 30 SCT 150 SCT 30 181/72/59/1011/006/ FEW MDT CU STRA CLDS
DSNT NNE-NE VSBY NNE-NE 12 THN FG WNW 45 N 20 DSNT HZ XCPT THN FG NNE-NE
WND 07V14 GST 15 KTS PST HR/ 8/240 58014 10074 20062 
 
WEATHER SUMMARY FOR TUESDAY SEPTEMBER 27
 
TEMPERATURE (DEGREES F)
MAX.....74    NORMAL.....67
MIN.....63    NORMAL.....49
MEAN....69    NORMAL.....58
 
DEPARTURE FROM 30-YEAR NORMAL....................+11
TOTAL DEPARTURE FOR THE MONTH....................+79 [+2.7 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............18 NE  AT  2:44 P.M.
                   AERO...................23 NE  AT  2:45 P.M. * 
                   ASOS...................18 NE  AT  2:45 P.M.
                   DAVIS..................17 NE  AT  2:28 P.M. RMY 18
THE FASTEST MILE FOR YESTERDAY............12 NE  AT  2:43 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE.............14 NE  AT  2:30 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE............13 NE  AT  2:13 P.M.
AVERAGE WIND SPEED AND DIRECTION.........6.6 E
                   ASOS..................6.9
                   DAVIS.................6.3 NE  [045 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..........4.65  DEPARTURE.........+0.94
                         ASOS..............4.54
TOTAL PRECIPITATION FOR THE YEAR..........42.69  DEPARTURE.........+5.51
                        ASOS..............43.10**
**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 80/57/69/+6/0.00/668/88    20 SW  AERO 27 MPH SSW RMY 22 MPH
9/13 81/63/72/+9/0.00/627/83    27 S   AERO 32 MPH S   RMY 26 MPH
9/14 83/65/74/+11/0.02/429/57   24 WSW AERO 31 MPH S   RMY 26 MPH TSTM
9/15 80/49/65/+3/0.04/180/24    38 WNW AERO 47 MPH WNW RMY 42 MPH TSTM
9/16 62/43/53/-9/0.00/703/94    28 WNW AERO 35 MPH WNW RMY 27 MPH
9/17 62/43/53/-9/0.00/551/74    17 NNE AERO 24 MPH NNE RMY 18 MPH   
9/18 64/49/57/-4/0.00/349/47    25 NE  AERO 31 MPH NE  RMY 25 MPH
9/19 64/46/55/-6/0.00/658/89    17 SSE AERO 24 MPH SE  RMY 21 MPH
9/20 63/52/58/-3/0.14/000/00    23 S   AERO 31 MPH S   RMY 25 MPH
9/21 77/56/67/+7/0.01/617/84    18 S   AERO 24 MPH S   RMY 20 MPH
9/22 72/63/68/+8/0.16/.../..    17 S   AERO 24 MPH S   RMY 19 MPH
9/23 73/66/70/+10/0.64/000/00   18 SE  AERO 28 MPH SE  RMY N/A
9/24 77/68/73/+14/0.41/007/01   27 SSE AERO 36 MPH SSE RMY N/A 
9/25 79/67/73/+14/0.00/.../..   13 NNE AERO 18 MPH NNE RMY 14
9/26 77/65/71/+12/0.00/.../..   14 SSE AERO 22 MPH SSE RMY 16
9/27 74/63/69/+11/0.00/.../..   16 NE  AERO 23 MPH NE  RMY 18 F
 
9/28 our morning low temp: 60F; the normal low is now 49F
 
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 
9/24 - NEW DAILY RECORD HIGH MINIMUM TEMP OF 68F;
surpasses the previous record of 64F set in 1984
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 28
HIGH 82F IN 1959
LOW 33F IN 1897,1947
PRECIP 2.46 INCHES IN 2004
PEAK GUST 69 MPH NE IN 1962
 
RECORDS FOR SEPTEMBER 29
HIGH 85F IN 1952
LOW 28F IN 1914 (SEPTEMBER MINIMUM RECORD)
PRECIP 2.61 INCHES IN 1907
PEAK GUST 62 MPH S IN 2005
 
TODAY'S REPORT PREPARED BY: Robert Skilling