BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, SEPTEMBER 17, 2007    
ALL TIMES ARE IN EASTERN STANDARD TIME
 
A THIRD DAY OF LATE SUMMER SEASON CHILL
RAINFALL TOTAL OF 0.33 SATURDAY BUT ONCE AGAIN 
A DRY WEATHER PATTERN HAS RESUMED 
 
The coldest temperature of the season occurred at 
nearby Norwood Aiport when the thermometer dropped
to a frosty 33 degrees this morning. Atop Blue Hill 
this morning it was a degree less cold than yesterday.  
The low was 46 after our coldest was 45 degrees yesterday
morning. The rainfall of 0.33 inch on Saturday was not 
enough to stop a gradually increasing deficit for the month. 
 
Today's observations:
 
7 A.M.   
Weather: Clear, cumulus along shore NE thru distant SE-S  
Temperature: 51F, Dew point: 44F, Wind: N at 8 kts 
Wind: direction gradually veering 
Sea-level pressure: 30.44 inches Hg, rising
Visibility: 80 miles, patches of shallow ground fog dissipating   
6-hour min temp: 46F
24-hour rainfall: 0.00 in 
BHO SA 1155 CLR 80 308/51/44/0108/044/ LINE CU/MDT CU ALG SHR 
NE-DSNT SE-S PTCH DENSE SHLW FG OVR POND SE FEW PTCHS SHLW THN FG 
SW-NW WND GRDLY VEERING/ 8/200 53015 10052 20046 
 
10 A.M.   
Weather: Scattered cumulus  
Temperature: 60F, Dew point: 48F, Wind: NNE at 9 kts 
Wind: variability N-E
Sea-level pressure: 30.48 inches Hg, rising
Visibility: 70 miles  
BHO SA 1455 20 SCT 70 322/60/48/0309/048/ CU/MDT CU ALQDS
WND 36V08/ 8/200 51012
 
1 P.M.   
Weather:  Scattered cumulus/stratocumuls clouds 
Temperature: 63F, Dew point: 44F, Wind:  NNE at 11 kts
Sea-level pressure: 30.46 inches Hg, falling
Visibility: 70 miles 
6-hour max. temp: 64F 
6-hour precip: 0.00 in. 
BHO SA 1755 40 SCT 55 SCT 70 315/63/44/0311/046/ 
FEW MDT CUFRM TOPS WND 35V07/ 8/400 58007 10064 20051
 
WEATHER SUMMARY FOR SUNDAY, SEPTEMBER 16
 
TEMPERATURE (DEGREES F)
MAX.....65    NORMAL.....71 
MIN.....45    NORMAL.....53
MEAN....55    NORMAL.....62
DEPARTURE FROM 30-YEAR NORMAL.........-7 
TOTAL DEPARTURE FOR THE MONTH........+24  [+1.3 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............20 WNW AT 1:40 P.M. 
                   AEROVANE...............17 WNW AT 1:16 A.M.
                   ASOS...................N/A  #
                   DAVIS..................20 WNW AT 1:40 P.M. 
FASTEST MILE FOR YESTERDAY................14 WNW AT 3:37 A.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............15 WNW AT 2:32 A.M. 
AVERAGE WIND SPEED AND DIRECTION.......... 8.1 WNW
                   ASOS...................N/A  #
                   DAVIS.................. 8.6 NW [310 deg]
 
# ASOS WINDS SWITCHED OFF BY NWS 6/6, IT IS NOT KNOWN WHEN 
  THAT DATA WILL RESUME
 
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.....-0.31  
                         ASOS..............1.88    
TOTAL PRECIPITATION FOR THE YEAR..........32.85  DEPARTURE.....-2.79
                         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/-6/225/30       36 WNW 
9/16 65/45/55/-7/0/606/81     20 WNW 
 
9/17 morning low temp. 46F; normal low now 53F
 
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 17
HIGH 86F IN 1915,1941,1991
LOW 38F IN 1959
PRECIP 2.73 INCHES IN 1933
PEAK GUST 60 MPH WNW IN 1999
 
RECORDS FOR SEPTEMBER 18
HIGH 88F IN 1906
LOW 36F IN 1919
PRECIP 4.25 INCHES IN 1996
PEAK GUST 77e MPH WNW IN 1948
 
TODAY'S REPORT PREPARED By: Robert Skilling