BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, SEPTEMBER 21, 2007    
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.   
Weather: Sky partially obscured with fog, 
scattered stratocumulus
Temperature: 63F, Dew point: 59F, Wind: N at 5 kts 
Sea-level pressure: 30.20 inches Hg, rising
Visibility: 3 miles, fog    
6-hour min temp: 60F
24-hour rainfall: 0.00 in 
BHO SA 1155 –X 45 SCT 3F 228/63/59/3505/020/ F2 THN F ALQDS/ 
8/500 53017 10063 20060 
 
10 A.M.   
Weather: Clear   
Temperature: 71F, Dew point: 58F, Wind: NNE at 5 kts 
Sea-level pressure: 30.22 inches Hg, rising
Visibility: 10 miles, hazy 
BHO SA 1455 CLR 10 235/71/58/0305/022/ K LYR W-NNE HAZY/ 51007
 
1 P.M.   
Weather: Clear, few cumulus S-SW 
Temperature: 76F, Dew point: 58F, Wind: W at 5 kts  
Sea-level pressure: 30.18 inches Hg, falling
Visibility: 12 miles, hazy
6-hour max. temp: 76F  
6-hour precip: 0.00 in. 
BHO SA 1755 CLR 12 220/76/58/0605/018/ FEW CU S-SW HAZY/ 
8/100 56015 10076 20063
  
WEATHER SUMMARY FOR THURSDAY, SEPTEMBER 20
 
TEMPERATURE (DEGREES F)
MAX.....81    NORMAL.....70 
MIN.....53    NORMAL.....52
MEAN....67    NORMAL.....61
DEPARTURE FROM 30-YEAR NORMAL.........+6 
TOTAL DEPARTURE FOR THE MONTH........+15  [+0.6 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............18 SSW AT  6:43 A.M.  
                   AEROVANE...............14 SSW AT  6:39 A.M.   
                   ASOS...................N/A  #
                   DAVIS..................20 SSW AT  4:42 A.M.  
FASTEST MILE FOR YESTERDAY................12 SSW AT  4:43 A.M. *     
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............16 SSW AT  5:30 A.M.   
AVERAGE WIND SPEED AND DIRECTION..........7.1 SSW 
                   ASOS...................N/A  #
                   DAVIS..................8.0 SSW [214 deg]
* last of several occurrences..
 
# ASOS WINDS SWITCHED OFF BY NWS 6/6, TURNED BACK ON FRIDAY 
9/21 AT 8:30 A.M. EDT.
 
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.....-0.87  
                         ASOS..............1.88    
TOTAL PRECIPITATION FOR THE YEAR..........32.85  DEPARTURE.....-3.35
                         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/.../..     18 SSW
 
9/21 morning low temp. 60F; normal low is now 51F 
 
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.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 21
HIGH 91 IN 1895
LOW 35 IN 1929, 1956, 1962
PRE 5.58 INS IN 1961 (HURRICANE ESTHER; RETURNED AS TS SEPT 25-26TH)
WIND 186 MPH S IN 1938 (GREAT NEW ENGLAND HURRICANE; 
CALCULATED GUST, STATION RECORD
 
RECORDS FOR SEPTEMBER 22
HIGH 90F IN 1895, 1914
LOW 30F IN 1904 (Earliest freeze)
PRECIP 1.16 INCHES IN 2001
PEAK GUST 60 MPH SSW IN 1989
 
TODAY'S REPORT PREPARED By: Stephanie Radner