BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, SEPTEMBER 27, 2007    
ALL TIMES ARE IN EASTERN STANDARD TIME
 
NEW RECORD HIGH TEMPERATURE SET FOR SEPTEMBER 26TH...91 DEGREES 
ALSO HIGHEST TEMPERATURE SO LATE IN THE SEASON 
MINIMUM TEMPERATURE OF 67 DEGREES EQUALED RECORD HIGH MINIMUM 
SEPTEMBER SUNSHINE NEAR RECORD HIGH PERCENT
 
Several new records were set yesterday.  The maximum temperature
of 91 degrees broke the old record for the date of 87 in 1958. 
We also recorded our latest occurrence of 90 degrees for any year
on record; the previous record was 93 degrees on September 23 in 
1895 and 1914. Also, the minimum temperature of 67 degrees equaled
the record high minimum for the date set in 1920.  
 
More records could be set today. A minimum temperature of 65 degrees
recorded this morning would break 63 for a high minimum set in 1930. 
In addition, today's record high temperature of 84 degrees set in 
1998 might be within range. 
 
Sunshine for the month stands at 75% of possible, normal is 55% and 
the record for all of September is 74%. 
 

Today's observations:
 
7 A.M.   
Weather: Partial obscurement, fog 5/10ths 
Temperature: 67F, Dew point: 65F, Wind: S at 10 kts 
Sea-level pressure: 30.03 inches Hg, rising
Visibility: 3 miles, fog, and visibility increasing   
6-hour min temp: 65F
24-hour rainfall: 0.00 inches
BHO SA 1155 –X 3F 168/67/65/1710/003/ F5 VSBY INCRSNG/ 
51005 10067 20065 
 
10 A.M.   
Weather: Partial obscurement, haze 1/10th, thin broken cirrus 
Temperature: 77F, Dew point: 67F, Wind: S at 10 kts
Wind: Variability SSE-SSW
Sea-level pressure: 30.01 inches Hg, falling
Visibility: 9 miles, hazy
BHO SA 1455 –X 220 SCT 250 –BKN 9 164/77/67/1710/001/
H1 HAZY WND 15V21/ 8/001 58004 
 
1 P.M.   
Weather: High overcast cirrus partly thin   
Temperature: 82F, Dew point: 67F, Wind: S at 12G18 kts
Wind: Variability SSE-SSW 
Sea-level pressure: 29.99 inches Hg, falling
Visibility: 9 miles, hazy   
6-hour max. temp. 82F
BHO SA 1755 E220 BKN 250 OVC 9 155/82/67/1712G18/999/ 
BINOVC NW THN SPTS IOVC HAZY WND 15V21/ 8/007 58009 10082 20067 
 
WEATHER SUMMARY FOR WEDNESDAY, SEPTEMBER 26
 
TEMPERATURE (DEGREES F)
MAX.....91    NORMAL.....68 
MIN.....67    NORMAL.....50
MEAN....79    NORMAL.....59
DEPARTURE FROM 30-YEAR NORMAL........+20 
TOTAL DEPARTURE FOR THE MONTH........+84  [+3.0 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............32 S   AT  3:27 P.M.    
                   AEROVANE...............27 S   AT  3:27 P.M.     
                   ASOS...................32 S   AT  3:27 P.M.  
                   DAVIS..................36 S   AT  2:30 P.M. 
FASTEST MILE FOR YESTERDAY................23 SSW AT  3:26 P.M. *     
MAXIMUM 2-MINUTE ASOS AVERAGE.............25 S   AT  3:27 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE............27 S   AT  3:05 P.M.     
AVERAGE WIND SPEED AND DIRECTION..........15.0 SSW  
                   ASOS...................14.8  
                   DAVIS..................15.8 S [190 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..........1.86  DEPARTURE.....-1.71  
                         ASOS..............1.88    
TOTAL PRECIPITATION FOR THE YEAR..........32.85  DEPARTURE.....-4.19
                         ASOS.............32.11    
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2007...CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
 
9/1  79/57/68/+1/0/790/100    25 WNW   
9/2  78/51/65/-1/0/787/100    22 S   
9/3  85/57/71/+5/0/760/97     31 SSW AERO 28 MPH SSW 
9/4  76/61/69/+3/0/641/82     28 NW  AERO 26 MPH NW
9/5  74/53/64/-1/0/732/94     21 ESE 
9/6  76/55/66/+1/0/380/49     31 S
9/7  92/62/77/+12/0/680/88    30 SSW
9/8  93/67/80/+15/0/686/89    31 S    TSTM 
9/9  72/57/65/+1/0.16/000/00  28 NNE  TSTM 
9/10 66/57/62/-2/0.03/000/00  18 NNE
9/11 68/58/63/-1/1.34/000/00  30 WNW  
9/12 73/55/64/+1/0/752/99     35 W    Aero 33 MPH W
9/13 73/52/63/0/0/741/98      23 ESE  
9/14 76/56/66/+3/0/587/78     26 SSE
9/15 63/49/56/-6/0.33/225/30  36 WNW  
9/16 65/45/55/-7/0/606/81     20 WNW  
9/17 63/46/55/-7/0/738/99     20 NE  
9/18 64/46/55/-6/0/720/97     22 NE    
9/19 69/48/59/-2/0/414/56     18 S 
9/20 81/53/67/+6/0/597/81     18 SSW
9/21 77/60/69/+9/0/653/89     20 N
9/22 79/60/70/+10/0/417/57    27 S
9/23 77/59/68/+8/0/713/98     25 WNW
9/24 80/55/68/+9/0/703/97     24 WNW 
9/25 86/57/72/+13/0/701/97    27 SSW
9/26 91/67/79/+20/0/641/89    32 S    Aero 27 MPH S
 
9/27 morning low temp. of 65F; normal low is now 49F
 
NEW DAILY RECORDS FOR SEPTEMBER 2007: 
 
9/7 -  RECORD HIGH TEMPERATURE 92; PREVIOUS 91 IN 1945.
9/8 -  RECORD HIGH TEMPERATURE 93; PREVIOUS 91 IN 1945.
9/26 - RECORD HIGH TEMPERATURE 91; PREVIOUS 87 IN 1958.
     - EQUALED HIGH MINIMUM TEMPERATURE OF 67; ALSO IN 1920. 
     - LATEST 90-DEG. TEMPERATURES; PREVIOUS RECORD WAS 
       93 DEG. ON SEPT. 23, 1895 AND 1914.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 27
HIGH 84F IN 1998
LOW 32F IN 1947
PRECIP 2.26 INCHES IN 1962
PEAK GUST 100 MPH SSE IN 1985 (HURRICANE GLORIA)
 
RECORDS FOR SEPTEMBER 28
HIGH 82F IN 1959
LOW 33F IN 1897,1947
PRECIP 1.53 INCHES IN 1956
PEAK GUST 69 MPH NE IN 1962
 
TODAY'S REPORT PREPARED By: Robert Skilling