BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, SEPTEMBER 29, 2011
ALL TIMES ARE IN EASTERN STANDARD TIME
 
A NINTH CONSECUTIVE DAY TODAY WITH TEMPERATURES
RUNNING FAE FAR ABOVE NORMAL FOR LATE SEPTEMBER
EIGHT CONSECUTIVE DAYS WITH MINIMUM TEMPS. 60F PLUS
 
Some showers with brief downpours accompanied the arrival
of yet another invasion of very warm humid air overnight.
The total rainfall of 0.41 inch through 8 AM EDT pushed the
monthly total just past 5 inches. Temperatures have
averaged 10.4 degrees warmer than the long-term average
for the past 8 days and today will add a 9th day to the
unseasonably warm and humid stretch of weather.  
 
Today's observations:
 
7 A.M.  
Weather:  Obscurement with heavy fog, light drizzle occurring,
mostly very light,
Temperature: 64F, Dew point: 64F; Wind: ESE at 7 kts,
Sea-level pressure: 29.83 inches Hg, falling rising  
Visibility: 1/16 mile, light drizzle, heavy fog 
6-hour min: 61F
6-hour precip:  0.31 inch
24-hour precip: 0.41 inch
BHO SA 1155 W1X 1/16L-F 103/64/64/1107/983/ PCPN MSTLY VRY LGT/ 8////
56015 ASOS 60031 MANUAL 6031/ ASOS 70041 MANUAL 70041 10064 20061
 
10 A.M.
Weather: Obscurement with heavy fog, light drizzle occurring,
very light 
Temperature: 67F, Dew Point: 67F; Wind: SE at 5 kts,
Sea-level pressure: 29.80 inches Hg, falling
Visibility: 1/16 mile, light drizzle and fog  
3-hour precip: 0.01 inch
BHO SA 1455 W2X 1/16L-F 092/67/67/1305/980/ PCPN VRY LGT/ 8////
58011 ASOS 60001 MANUAL 6001/ 
 
1 P.M. 
Weather: Broken stratus fractus, overcast nimbostratus
Temperature: 69F, Dew Point: 69F; Wind: SSE at 9 kts, 
Sea-level pressure: 29.73 inches Hg, falling
Visibility: 15 miles, except 20 miles WNW and 12 miles to the
north, thin fog all quadrants  
6-hour max. temp: 70F  
6-hour precip: 0.01 in.
BHO SA 1755 E5 BKN 9 OVC 15 068/69/69/1609/973/ CIG RGD VSBY 12 WNW 20
THN F ALQDS REUKN/ 8/62/ 58024 ASOS 60001 MANUAL 6001/ 10070 20064 
 
WEATHER SUMMARY FOR WEDNESDAY SEPTEMBER 28
 
TEMPERATURE (DEGREES F)
MAX.....74    NORMAL.....67
MIN.....60    NORMAL.....49
MEAN....67    NORMAL.....58
 
DEPARTURE FROM 30-YEAR NORMAL.....................+9
TOTAL DEPARTURE FOR THE MONTH....................+88 [+2.9 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............22 E   AT  7:54 P.M. * 
                   AERO...................29 E   AT  3:54 P.M.  
                   ASOS...................24 E   AT  7:55 P.M. 
                   DAVIS..................24 E   AT  3:54 P.M. RMY N/A
THE FASTEST MILE FOR YESTERDAY............17 E   AT  5:57 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE.............16 E   AT 11:46 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE............17 E   AT  3:56 P.M. 
AVERAGE WIND SPEED AND DIRECTION........11.5 E
                   ASOS.................10.7
                   DAVIS................10.2 E [090 deg]
*last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.41 DEPARTURE..........+0.27
                         ASOS..............0.41
TOTAL PRECIPITATION FOR THE MONTH..........5.06 DEPARTURE..........+1.21
                         ASOS..............4.95
TOTAL PRECIPITATION FOR THE YEAR..........43.10 DEPARTURE..........+5.78
                        ASOS..............43.51**
**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 
9/28 74/60/67/+9/0.08/.../..    22 E   AERO 29 MPH E   RMY 28
 
9/29 our morning low temp: 61F; 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 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